When to Switch From Heating to Air Conditioning



Highlights

  • Maintain a constant temperature so your AC runs more efficiently 

  • Turning on your AC in the morning saves money and reduces wear and tear on your unit

  • Service your air conditioner regularly to maintain top performance

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When the 3 P.M. sun shines directly into your living room, you may be tempted to blast your AC for some relief. However, doing so would only cause you more torment. Running the air conditioner inconsistently will skyrocket your bills, but turning it on first thing in the morning? Yes, that’s the sweet spot.

The Best Time To Run Your Air Conditioner

Your house is at its coolest in the mornings. Outdoor temperatures drop overnight and the summer sun isn’t blazing down. Setting your AC to run in the mornings is the best way to maintain a comfortable indoor temperature and save money on cooling costs because the unit doesn’t have to work as hard.

Turning off the AC during a heatwave can quickly introduce a lot of heat and humidity into your home. After even just a couple of hours, your AC will have to work hard to lower the temperature back to a comfortable level. (Cooling home back down from 82 degrees is a lot harder than from 78 degrees.) Instead, set your thermostat to a desired temperature based on the time of day. With this “setback” method, you want to keep your setback temperature and comfort temperature within 5 degrees of each other.

How to Help Your AC Work Even Better All Summer Long

Using the AC at the correct time isn’t the only way to save on cooling costs. There are a few other ways you maximize your comfort while minimizing your electricity bill.

Invest in a Programmable Thermostat

Digital thermostat mounted on the wall by the stairs

Photo: Christian Delbert / Adobe Stock

Programmable thermostats take the guesswork out of running your AC and help adhere to the “setback” method. Set one temperature for when you’re home and another for when you’re away and your home will be comfortable all summer long. Also, smart thermostats are great for energy savings, because you aren’t cranking up the air conditioner when you get home on a record hot day or constantly adjusting your A/C unit because you can’t get the temperature just right.

Get an Energy Audit 

Energy audits pinpoint leaks and weak points in your home’s ability to maintain a constant temperature. An audit will help find leaks in windows and doors that can be sealed with weatherstripping to ensure your cool air stays inside.

Plant Trees or Shrubs to Provide Shade

Planting trees or shrubs on the east and west sides of your home to help block morning and afternoon sun. Incorporate a variety of heights to account for the differing angles of the rising and setting sun. Choose deciduous trees so winter foliage won’t block the sun’s heat during colder months.

Have Your Air Conditioner Serviced Regularly

Air conditioners are workhorses during the summer months and the last thing you want is to have your AC stop working in the middle of a heatwave. Having your unit serviced every year, in early spring prior to turning it on for the summer, will ensure it works at peak efficiency. An HVAC technician will check coolant levels and pressure, inspect electrical connections, clean drains and lines, and clean the evaporator coil. If necessary, they’ll also suggest a plan to repair your unit.

FAQs

At what temperature outside should you turn on the AC?

It’s advisable to turn on your AC if the temperature is about 59 degrees Fahrenheit or higher. This way, the oil that lubricates the parts of the AC will warm up before running through the equipment. Also, this practice will ensure there’s no ice inside your condenser before you turn it on

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Is it too soon to turn on the AC?

As a general rule of thumb, wait for the first stretch of 70 degrees + weather to hit the area. This is when you’ll turn on your AC for the first time. However, you’re not doing so because you necessarily need to cool down your home

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Is 72 too cold for AC?

Once you have the right size air conditioner, there’s still an ideal temperature range to consider. It’s best to not set your thermostat lower than 70 to 72 degrees. Most units are not designed to cool a house below that point, and you risk the system freezing up.

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What’s the lowest you should set your AC?

In short, the 20-degree rule of air conditioning states that you should always keep your AC unit at no more than 20 degrees lower than the outside temperature. It means that, if the outdoor conditions are at 95 degrees, you should set your thermostat at no less than 75 degrees.

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How should I set my AC to save money?

To stay comfortable and save money this summer, the U.S. Department of Energy recommends setting your thermostat to 78F (26C) when you are home. Setting your air conditioner to this level will allow you to stay cool and avoid an unusually high electricity bill.

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Is it cheaper to leave the AC on all day?

Your AC will actually run longer overall if it is left on all day instead of being shut off. If you turn it off for part of the day, it runs less and results in more energy savings for you. In almost all cases, it will save you money to shut off your AC while you are away from home.

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What is the most efficient way to run your AC?

Run your air conditioner on the lowest setting required and turn the ceiling fan on. This way, cool air will spread across a wide area, maintaining a comfortable environment. Instead of choosing between an air conditioner and a fan, it’s best to combine the two for maximum comfort and efficiency.

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How many hours should AC run per day?

A central AC cools down the entire house. It is more energy-efficient than other types of air conditioners, and thus, you do not need to run it for as many hours as different types of air conditioners. In general, you should run a central AC for about 8 hours per day to keep you comfortable.

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Should I turn my AC off at night?

The outdoor nighttime temperature. If the nighttime air that comes into your home cools the indoor temperature to lower than you usually set the thermostat for the air conditioner, turning off the AC should save you some money.

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When Should I Turn my AC on in Order to Save Money? |

When Should I Turn my AC on in Order to Save Money? Have you ever wondered if you’d save energy by switching off your AC at strategic times of the day? Perhaps the rising cost of energy has filtered down to your monthly bills, and you’re already beginning to feel the pinch. With the AC consuming almost 50% of the energy needed in your home, cutting back seems to make sense. Since there’s an endless debate on whether or not to switch off the air conditioner at particular times, we wanted to set the record straight. Read on to find out when you can turn off your AC to save money. Indoors for a Long Time If you spend a lot of time indoors in Modesto, CA, it makes perfect sense to turn on your AC. Saving money may be a priority, but it should not compromise your comfort. Switching the AC off while indoors would create an uncomfortable environment. Furthermore, stopping airflow through the HVAC system’s filter may lead to worse air quality. For this reason, switching the AC on while indoors can actually save money. This is especially true if some members of your family often suffer heat rashes or allergic reactions when exposed to a hot humid environment. Though the energy bill may increase, you won’t have to worry about healthcare expenses. It doesn’t make any sense not to turn on your AC in the evening when everybody is home from work or school. You need a cool environment for the evening. However, you could consider purchasing a smart thermostat. These devices can be programmed to turn the system down or off when no one is home. No Other Means to Cool Your Spaces You should turn your AC on if you have no other means to cool your space. Of course, air conditioning is the main option for most homes during the summer. Few can withstand the hot and humid air, which may become stuffy in a poorly ventilated room. However, you may want to invest in alternative cooling options. Just be sure that they don’t consume more energy than your air conditioner. A good example is the ceiling fan. Your fan will improve airflow and give the feeling of a cooler temperature by creating a breeze. But if you have to keep it running the whole day and night, you may end up footing a larger energy bill at the end of the month. Whether you rely solely on your AC or have other options for cooling your home in the summer, it is important to consider their ability to save energy. After all, you may just realize that your AC is the cheapest alternative. Need to Boost the Efficiency of Your AC? If you need to keep your AC operating at maximum efficiency, it does not make financial sense to turn it off. Switching your AC on and off may consume more energy than if you left it running. The power needed to crank the system up to its optimal working level could be substantial during summer. A better alternative is to just program a higher temperature for when you’re not home. For every raised degree, your AC unit decreases its energy consumption by up to 5%. Experts often suggest 78°F as a good away-from-home temperature. Since this is not too far off from the optimal temperature for comfort, you won’t have to crank the AC up once you get home. Your AC also works better when put to maximum settings. The system will actually use less energy. Set your thermostat to maximum temperature, and…

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Here's Why You Should Turn Your AC on First Thing in the AM

Here’s Why You Should Turn Your AC on First Thing in the AMHighlightsMaintain a constant temperature so your AC runs more efficiently Turning on your AC in the morning saves money and reduces wear and tear on your unitService your air conditioner regularly to maintain top performanceGet quotes from up to 3 pros!Enter a zip below and get matched to top-rated pros near you.When the 3 P.M. sun shines directly into your living room, you may be tempted to blast your AC for some relief. However, doing so would only cause you more torment. Running the air conditioner inconsistently will skyrocket your bills, but turning it on first thing in the morning? Yes, that’s the sweet spot.The Best Time To Run Your Air ConditionerYour house is at its coolest in the mornings. Outdoor temperatures drop overnight and the summer sun isn’t blazing down. Setting your AC to run in the mornings is the best way to maintain a comfortable indoor temperature and save money on cooling costs because the unit doesn’t have to work as hard.Turning off the AC during a heatwave can quickly introduce a lot of heat and humidity into your home. After even just a couple of hours, your AC will have to work hard to lower the temperature back to a comfortable level. (Cooling home back down from 82 degrees is a lot harder than from 78 degrees.) Instead, set your thermostat to a desired temperature based on the time of day. With this “setback” method, you want to keep your setback temperature and comfort temperature within 5 degrees of each other.How to Help Your AC Work Even Better All Summer LongUsing the AC at the correct time isn’t the only way to save on cooling costs. There are a few other ways you maximize your comfort while minimizing your electricity bill.Invest in a Programmable ThermostatPhoto: Christian Delbert / Adobe StockProgrammable thermostats take the guesswork out of running your AC and help adhere to the “setback” method. Set one temperature for when you’re home and another for when you’re away and your home will be comfortable all summer long. Also, smart thermostats are great for energy savings, because you aren’t cranking up the air conditioner when you get home on a record hot day or constantly adjusting your A/C unit because you can’t get the temperature just right.Get an Energy Audit Energy audits pinpoint leaks and weak points in your home’s ability to maintain a constant temperature. An audit will help find leaks in windows and doors that can be sealed with weatherstripping to ensure your cool air stays inside.Plant Trees or Shrubs to Provide ShadePlanting trees or shrubs on the east and west sides of your home to help block morning and afternoon sun. Incorporate a variety of heights to account for the differing angles of the rising and setting sun. Choose deciduous trees so winter foliage won’t block the sun’s heat during colder months.Have Your Air Conditioner Serviced RegularlyAir conditioners are workhorses during the summer months and the last thing you want is to have your AC stop working in the middle of a heatwave. Having your unit serviced every year, in early spring prior to turning it on for the summer, will ensure it works at peak efficiency. An HVAC technician will check coolant levels and pressure, inspect electrical connections, clean drains and lines, and clean the evaporator…

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Best Time to Turn On Your Air Conditioner – HVAC Guides 101

What Is The Best Time to Turn On Your AC to Save Money?If the weather is too hot and humid, you may want to use an air conditioner to stay cool. Apart from maintaining temperature and moisture, it can also improve air quality. However, your electricity bills will likely go up! That’s not nice at all, right? Well, you can lower your electricity bill if you know when to turn on the air conditioner.Most people turn off the AC while they are at work and turn it back on once they get home to save money. But to be honest, this approach isn’t helpful at all!Don’t worry, though. We are here to guide you with our effective tips and tricks on how to lower your electricity bill.Best Time to Turn On Your Air ConditionerIf you keep asking yourself this question: what is the best time to turn on your air conditioner in the house? The answer is – to keep it on at all times.Keeping your air conditioner turned on during the day will be more economical unless you are on vacation or planning to spend a few nights away from your home.The primary function of air conditioners is to maintain a stable temperature. When you live your AC on during the day, it spends fewer units to keep your home cool, thereby reducing your overall energy bills.HVACGUIDES101’s BOTTOM LINEKeep the AC ‘ON’ at all times.Related: Can You Leave a Window Air Conditioner On All Day?Some Tips to Lower Your AC BillsTurning on the AC at all times helps, but there are other steps you should take to make the actual difference. These additional tips will help you save money on electricity bills:Upgrade Your ThermostatHaving a smart thermostat can work wonders. It allows you to control the room temperature with the help of a phone application. You can set temperatures for specific days, times, and weeks, so your AC adjusts automatically.For example, you can set your AC to be cooler during the day and a little warmer at night. This approach automatically results in a reduced power bill every month.To set the smart thermostat effectively, keep a close eye on the temperature during different hours of the day and program it accordingly.Another important thing to keep in mind is the placement of your thermostat. You should avoid extreme temperature areas such as near windows, doors, and bathrooms. If you won’t, your thermostat will think your room is cooler or warmer than it actually is!Read also: Room Temperature Does Not Match Thermostat SettingUse of Ceiling FansUsing a ceiling fan will help ensure your room temperature stays cool. As a result, your AC will not have to work too hard, while also bringing down utility bills. We would recommend going for a smart ceiling fan as it gives you more control.You can also automate the operating of your smart fan using an app.Read Also: Can You Have a Ceiling Fan On While Using a Humidifier?Control Room TemperatureIf you are out on vacation or traveling somewhere, it makes no sense to keep your air conditioner turned on. However, you can still control your room temperature by closing the blinds.Using a diffuser once in a while helps as well. You can also install light-reflecting sheets on your windows.Taking these small measures ensures that your air conditioner doesn’t have to work hard to maintain the temperature.Recommend: Putting Aluminum Foil on Windows to Keep the Heat OutClean Your Air ConditionerA clean air conditioner delivers optimal performance and lowers electricity bills. You need to make sure that there is no dirty filter. Doing a yearly AC cleaning generally does the job.If required, you should replace the filters to see a difference in the energy bills. Check your AC for any possible refrigerant leaks. Also, look over the coils (evaporator and outdoor), and adjust the blower’s components. You may want to call professional help if necessary.At What Temperature Should You Turn on Your Air Conditioning?Honestly speaking, there is no standard temperature. We all live in different climates…

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help: when should i switch from heat to ac?

When to Switch From Heating to Air ConditioningAs temperatures fluctuate during seasonal changes, you might find yourself living in a home that is too cold at night and too warm during the evenings. So is it okay to toggle between AC and heat settings throughout the day? Here is a look at switching your thermostat from heat to AC settings. Is it Okay To Switch Back and Forth Between Heat and AC?The whole purpose of your HVAC system is to keep your home comfortable. While many homeowners think they need to stick to one setting or the other, this is not true. As long as you are careful in your setting changes and take good care of your system, you are fine to toggle between AC and heat settings. When Turning on the HeaterSometimes, the temperatures in early spring slip backward, and you may find yourself uncomfortably cold on a spring day. It might also get cold at night after the sun sets, even when the temperature is high during the daylight hours. When this happens, it is completely okay to kick your heating system back on to keep the temperatures regulated in your home. However, your AC temperatures are likely set high to save money on your AC usage. If you keep those same high settings when switching back to heat, your system will start operating heavily. Remember to adjust your temperature settings accordingly when switching your heater back on. When Turning on the Air Conditioning As spring temperatures heat up, you might find that your home becomes increasingly warm. You can begin switching on your air conditioning system as soon as your home needs it. When you turn on your air conditioner, turn the setting up to the highest comfortable temperature. Your heat settings may be lower to keep your system from overworking. If you maintain those same low temperatures when you switch to AC, your system will kick into high gear. After any signs of cold backtracking are gone, it will be safe for you to leave your air conditioner on without needing to toggle back to heat settings. When Toggling is an IssueWhile switching back and forth between heat and AC should not be an issue, there may be problems when your system does not receive the proper care it needs. For example, if you do not complete regular maintenance, your system is more likely to encounter a problem when asked to work under these changing conditions. One failed part can shut down your entire HVAC system. Your heating and cooling unit will be especially vulnerable when switching on and off repeatedly. Routine maintenance helps check that all of your system’s parts are working properly. A professional will detect irregularities early and repair any present issue before it becomes a problem. It is also essential that you make sure your system is ready for the new season. Did you get it geared up for spring with proper refrigerant levels, a clean drain line, and a fresh filter? Is your compressor, fan, and motor clean and ready to go? If not, an experienced technician can get your air conditioning system ready to work. As we mentioned earlier, toggling may also become a problem when you do not mindfully set the temperature each time you switch your system over. However, with the right care and attention, you can safely and easily interchange your thermostat between heating and cooling settings. Tips to Give Your System a BreakWhen the temperatures outdoors are comfortable, you may be able to save a little bit of money and keep your home comfortable by minimizing your HVAC use. Here…

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When is the ideal time to turn on your air conditioner?

When is the ideal time to turn on your air conditioner? Summer is approaching and coming along with it are uncomfortably hot temperatures. We’re often teased with a sprinkle of summer in April and May, and for some, that is reason enough to put on their shorts and crank the air conditioning. We’re all about conserving energy, saving money and living comfortably here at A1. Because of this, we have set out on a quest to find the ideal time to turn on your air conditioner. We will use the World Health Organizations (WHO) standards for a healthy indoor temperature to find out. The WHO recommends 18⁰ Celsius as a minimum for indoor temperature but recommends 21 degrees if there are any children or elderly people in the home. Overall the range of temperatures they deem safe is 18⁰to 22⁰, but we’ll stick with the 21⁰. According to accuweather.com, the temperature in Toronto only reached above a high of 20⁰ twice in April and nine times in May. Although temperatures fluctuate a great deal throughout April, May and even June, the average high temperature doesn’t rise above 21⁰until early June. However, the average low temperature doesn’t reach above 18⁰ until the end of June. While there are different preferences for temperature and certainly fluctuations in temperature on specific dates from year to year, it’s likely that you won’t need to turn your air conditioning until early June at the earliest. The low temperature reaching a comfortable level much later than the high also stresses the importance of a programmable thermostat. Your temperature needs will change drastically depending on the time of day, so ensuring that you conserve energy while the outdoors will cool your home for you is essential to lowering energy costs. Taking this data into consideration, we have decided to officially name June 1st Southern Ontario’s “Turn on your Air Conditioner Day”. We recommend you hold out on starting your home cooling system until then to reap the rewards of lower energy costs. To reach the utmost level of efficiency, however, you should be making sure your air conditioner is ready for our official launch into the cooling season. Schedule a Check & Clean for your system today! Education Hub

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When Is It Time To Turn On The AC?

When Is It Time To Turn On The AC? | Genuine Comfort Heating & AirUtah summers are known for hitting triple-digits several days of the year. Without an efficient air conditioning system, you will be hot in your home! However, many people often turn on their air conditioners too early. If you are turning it on in April and May, you are asking the air conditioner to work longer this year than usual. We all want to be comfortable in our homes, but do we really need to kick on the air conditioner when it’s 80 degrees outside? Here are some tips to help you know when its time to turn on the AC, and how you can keep those utility costs under control! Start by inspecting your air conditioner and cleaning outside lines to make sure it is ready to turn on. We always recommend a spring tune-up to ensure your air conditioner is working properly. If the air isn’t as cold as it should be, it may need a refrigerant recharge or could have a leak. Here are some of the things to look for when you are getting ready to turn on the air conditioner: Check the thermostat. How old is your thermostat? Modern thermostats are designed to be programmed in a way to reduce energy consumption. Some of the new ones can be controlled from your smartphone, and makes it easier to keep tabs on your home when you are on vacation.Look for signs of wear and tear. Do you see some exposed ductwork that looks like its wearing out? Replacing the ductwork should be left to the professionals!Clean the air vents and return vents in the home. Dirt, dust, toys, food particles, and all types of debris can block off the airflow. Clean those out each spring and fall with a vacuum, and pay to have a complete ductwork cleaning at least once every other year. Clean the drain line. Inside the home there is a drain near the air conditioner and it needs to be cleaned out to work correctly. Keep the drain clean by rinsing it with bleach and hot water. If the drain isn’t working the right way, you will end up dealing with water problems in the home.Replace the air filter. We cannot stress this enough! An air filter is a critical part of the air conditioner. If your air filter is clogged, it caused more strain and stress on the motor of the air conditioner. In addition, the air flow in the home will not be as effective. Some air filters are reuseable and need to be cleaned while others are disposable and need to be replaced every 30 days. Examine electrical circuits. Make sure all the electrical connections are on and working properly. Check the exterior unit. The outdoor condenser unit needs to be inspected and cleaned to remove any blockages that can lead problems with the fans and correct airflow. Are the refrigerant lines insulated? Professionals will need to do the work on the refrigerant lines, and they should be insulated to make sure the system is working efficiently. Air conditioners have an expiration date! Some air conditioners can last 20+ years, but others only last ten. It is vital to check on your unit to know when it was manufactured so you can get an idea of when it needs to be replaced. We highly recommend contacting our office to schedule your yearly air conditioning inspection. We can provide you with tips and recommendations on how to keep your summer cooling costs lower, and avoid turning on the air conditioner as long as you can and enjoy the crisp Utah air! Heating & Air Conditioning Services in Centerville & Bountiful, Utah Don’t let those triple digit summers get you down, at Genuine Comfort, we are Northern Utah’s hot and cold experts! Genuine Comfort is a family-owned and operated HVAC company providing service to our customers in Centerville, Utah, and surrounding areas. We strive to provide our clients with the best customer service and top HVAC products…

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When Should I Turn my Air Conditioner On? – FLAME Furnace

When Should I Turn my Air Conditioner On? | FLAME FurnaceHappy first day of Spring!  Despite the calendar telling us that it is the first day of spring, it can be hard in Michigan to truly believe that warmer weather is on its way and that it is here to stay.  March and April are months of change where some days we walk outside in flip flops and on other days we pull back out the snow boots.  With all of this unpredictability how can we know when to make the switch from heating to cooling?  When should you turn your air conditioner on?The first thing to know is that you do not need to have an air conditioner inspection done before you turn on your air conditioner.  The inspection is important to make sure that the unit is running safely and efficiently throughout the cooling season, but if you and your family are dying for some cool air-go ahead and turn it on.  We can still do the inspection at a later date.We recommend that you wait until there has been at least two days of warm weather before turning the air conditioner on.  That way the warm air can loosen up the oil that it is in the compressor.  Not waiting can result in problems with the compressor.  So, if in typical Michigan fashion, the weather forecast calls for an 80 degree day in April followed by a 55 degree one, it is better to keep the a/c off until the warmer weather is more consistent.If you are switching between using your furnace and your air conditioner, wait a few minutes between turning one off and turning the other on.  This prevents the circuit board from frying.For more information about getting your air conditioner ready for warm weather, do not hesitate to contact Flame!

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How to Turn On Your AC For the First Time After Winter

How to Turn On Your AC For the First Time After Winter With summer just around the corner, we’re nearing your air conditioner’s first day of work, all in an effort to keep your house cool and comfortable. Like any seasonal change in Oregon, it seems like the first hot day arrives unexpectedly. When it does, we usually just turn on the central air without thinking about it. Most of the time, it activates normally and gets to work. Sometimes, though, problems have developed over the winter months, and we end up living with the sweltering heat as we scramble to schedule AC repairs. If you’ve ever experienced an early heat wave without the benefit of air conditioning, you know just how miserable it can be. When Should You Turn Your Air Conditioner On? Most people assume they can wait to turn on their AC on the first hot day of the year. But waiting this long means you may miss problems that have developed over the winter months. Most HVAC technicians recommend you turn on your AC in the spring when you know you’ll be home for the day. This will give you a chance to test your HVAC system and catch any problems that require repairs. Better yet, schedule an air conditioning maintenance appointment! During this appointment, a certified HVAC technician comes out to your home, looks over your entire system, changes your air filter, and makes recommendations for cooling repairs. This service is quick and easy, and it ensures your system will be up to the task of keeping your home cool all summer long. Important Things to Know Before Turning On Your AC for the First Time Here are the four most important things to check before flipping the switch on your thermostat from “heat” to “cool”. Check the Outdoor Component Air circulation is key for your heat pump to work properly, so spend some time checking over your outdoor unit. Be sure that it’s not filled with leaves or other debris. There may even be plants that have grown into the system in the fall. Any obstruction to airflow can put a strain on the compressor, shortening its overall lifespan, so be sure to clear away anything that’s blocking airflow before turning your system on. Examine Coolant Lines The refrigerant in your AC system is essential to its operation. If it leaks out during the off-season, your system can work all day long without producing any cold air. Before you turn on your system for the season, take some time to inspect coolant lines for cracks or holes, and check connections to make sure nothing is loose. They could have suffered damage from water damage, wildlife, pets, or human activities. Even the tiniest pinhole will allow refrigerant to leak off slowly. Any signs of damage will call for a visit from an HVAC company. Check Visible Wires It’s important to remember that your AC unit is an electrical system. If the flow of electricity is disrupted, your whole system may stop working. For that reason, you should examine all visible wires for signs of wear. If you find anything suspicious, turn off the power to the unit and contact your HVAC company for a system inspection. Be sure to steer clear of any exposed connections, and don’t remove cover panels or screws. Just check out the visible wiring and be alert to anything that looks unusual. Change your Filters Changing your air conditioner’s air filter is the easiest way to lower energy costs and extend the life of your system. High-quality filters also capture allergens, removing them from the air that you and your family breathe each day. With the Willamette National Forest covering so much of Central Oregon, there is no shortage of pollen in the air! Most HVAC…

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Reasons to Avoid Turning Your AC on Too Early in the Season

Reasons to Avoid Turning Your AC on Too Early in the SeasonAs the weather in Ohio gets warmer and spring begins to approach summer, it may seem tempting to turn your air conditioning on and avoid the slightest hint of heat. In fact, sometimes people like to turn it on the second it gets up to 65 degrees on that early April day and then try to keep it running throughout the night when the temperatures drop back into the 50s. However, the air conditioner should only be on if the temperature outside is 65 degrees or above, and the idea is to only use it if the thermostat starts hitting 70 degrees. There are several reasons not to run an air conditioner when it is below this temperature or too early in the season:1. Damaging your air conditioner’s oilAir conditioners have a part called a compressor, which — true to its name — compresses the refrigerant, a substance that is used to cool down the air in your home. This allows the refrigerant to circulate through tubes inside the air conditioner, and drives the heat-transfer process that leads to the cold temperature you expect from an air conditioner. However, the oil in the compressor is very thick, which means that when it is too cold, the oil can congeal, damaging the compressor and preventing the air conditioner from working when you actually need it.2. Freezing the evaporator coilDuring the cooling process, the refrigerant enters the evaporator coil and absorbs heat from the surrounding air, thus removing heat from inside your home and lowering its temperature. However, because these coils rely on a steady stream of warmer air to keep them operating, coils can freeze if it is too cold and the air that is blowing through doesn’t actually transfer any heat, leading to malfunctions.In order to avoid these problems, you should check the weather forecast to see overnight temperatures and switch off the air conditioner if it drops below 70 degrees. Or, to make things easier on yourself, just make it a habit to turn it off after the sun goes down in those in-between months when it’s warm during the day but cool at night. Then, once the temperatures break permanently into summer, you can keep the air conditioner set at a certain temperature all the time and not have to worry about the issues listed above.

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