We often hear the debate around whether or not to run your AC Fan continuously. Leaving that fan on 24/7 is great for cleansing allergens from the air … Here are the pros and cons to this approach: There is no right or wrong answer. at THERMOSTAT WON'T TURN OFF. Many heating and cooling appliances with a fan option that, while still blowing warm or cool air, is not using the main power of the unit. When the fan is in the auto mode, the air conditioner moves air only when the cooling part is running. Plus, the air in your home will be cleaner because it’s … There are also times where you can fix it … When you set your fan to “ON,” you’re telling it to keep running 24 hours a day, 7 days a week, regardless of the heating or cooling setting. In fact, even your central air conditioner is equipped with a fan powerful enough to force air through your entire home. The fan mode for central air conditioning systems is entirely different from the fan mode for window-box air … When the fan's in the on mode, the fan keeps running continuously, even when the cooling part is turned off. Keeping the fan on creates an evener distribution of heating and cooling, circulating the air if you have cold or hot spots in your house, like a bedroom above a garage. If you have an efficient filter and a UV light, you are constantly filtering and cleaning the air. Source. A continuously running fan provides constant air flow in the area to be cooled, keeping the room at a more comfortable temperature. When the thermostat senses that the house has reached the setpoint, it shuts off both the cooling and the fan. After keeping the fan constantly running for an extended period, you might find your comfort significantly increases. Cons to Keeping Fan Continuously Running: It could cost you hundreds of dollars a year. I leave my fan on to keep air circulating but I’ve heard lots of different answers, including ‘The AC pulls in air from the outside,’ but I don’t think that happens unless a door is open. We deliver the best home inspections in your neighborhood. Many different factors can impact your decision whether to keep your HVAC system set to Auto or On. 2. Learn how to troubleshoot and fix an AC fan that stays on. You may feel a less even distribution of heating and cooling because once the thermostat is satisfied, the fan stops moving air to other spaces in the home. An air conditioner fan that continuously runs is a red flag indicating you have a problem with your system. There are a few positives to this feature. Clogged air filter. It may seem logical to think that a fan for an air conditioner is the same as a fan that you use in a room, thought this is not the case. Note that some systems and thermostats have another option called “Circulate”. When the selector switch is in the Fan Cool or Heat position, the fan will run continuously. Without enough air flowing over the coils, the system can’t remove humidity and cool the air to the set temperature, so it keeps running when it shouldn’t. One way to cut back on the energy bill is to just use the fan option on the air conditioner. 6 Common Causes of Air Conditioning Leaks. When your fan is continuously moving the air, it helps to dry it out. What's your goal: comfort or efficiency? Air Conditioner Compressor Is Not Working, and Fan Is Running. However, keeping your fan running for a few minutes after you turn off your air conditioner will help you avoid dryer air during the winter months. This is sometimes simple to resolve. It could cost you hundreds of dollars a year. Just contact us and we can get your furnace fan running normally in no time. There typically also are larger vents, usually one per floor, which collect and return air back to the fan to be reconditioned and distributed throughout the home. One main drawback of have your furnace fan continuously running is you … We offer new customer specials as well as regular maintenance program – called Bayside Comfort Care. A fan that runs continuously typically means there’s a bigger issue. Using the pros and cons above you can decide for yourself what will work best for you. First of all, depending on the type of motor the furnace has, having the fan on continuously may add several hundred dollars to the home's electric bill. Air Conditioning and Cooling Systems - A/C condenser fan runs continuously - There were several older threads on this topic and it was noted in one of them that some newer condenser units have a dpst A/C condenser fan runs continuously - DoItYourself.com Community Forums In this case, maybe it would be worth running the heating and cooling fan even when the air conditioner itself isn’t running. Restrictive filters. Some HVAC technicians also state that it is better for the fan motor to run continuously instead of turning on and off with the furnace. An Alternative for Saving Energy. By running the furnace fan all the time, you are also running air through your furnace filter constantly. More frequent starts and stops will make the fan wear out faster. The fan’s “AUTO” setting works with your heating + cooling system, so your fan is running the least amount of time needed, at the slowest speed. It can encourage biological growth and make you feel warmer in summer. Your other option is to set your fan to AUTO, which means the fan runs when directed to by the unit. A typical AC fan motor uses about 500 watts when it’s running. When the a/c is off the fan spins but not too fast, it does goes fast when the a/c is running. The best thing you can do to avoid costly AC Repairs is to make sure you are maintaining your unit properly. If we assume an average of 10 hours on and 14 hours off per day, energy costs are reduced by 60% to about $18 per month or $215 per year. However, if your AC is running continuously and never turning off, this isn’t normal and you likely have a problem with your air conditioner. Air Conditioners Why The Fan Runs Continuously. If your fan runs continuously, moisture does not have a chance to drip outside. Benefits of Always Running Your Furnace Fan. It’s actually designed to run continuously. © Copyright 2020 - Bayside Heating and Air, AC REPAIR POINTERS THAT CAN SAVE MONEY – CHECK YOUR BREAKER. How It Works. At the furnace or air conditioner air handler or blower unit: the fan limit switch may include a switch that manually keeps the fan running. The fan limit switch is responsible for turning … A typical AC fan motor uses about 500 watts when it’s running. Should I Leave the Fan Running on My Furnace or Air Conditioner All the Time? The fan mode and switches are one such example. Bayside Heating and Air Conditioning is fully licensed and bonded. All Rights Reserved © US Inspect Group, Inc. 2020. “What’s more energy efficient – ON or AUTO? The system usually includes a filter in the loop, typically in the air handler where the fan is located; the filter cleans air before it is recycled. Shorter furnace filter life. AC Repair Pointers – Clean My Drain Line. Read on to learn why the AC fan keeps running on your unit. If comfort is your goal, leave the fan running. If you do want to run the fan continuously, there are a few important things you’ll need to consider…. Keeps the ambient air at a more even temperature. We deliver the best home inspections in your neighborhood.Our reputation is built on decades of honesty, integrity and excellent service to customers during one of their most important life decisions – buying or selling a home. We are also extremely proud of our “Super Service” awards, presented yearly by Angie’s List, for our high standards and customer satisfaction. The average unit has a 500-watt fan, which uses almost as much energy over the course of the year as a refrigerator, resulting in a $50/month bill. Those problems are explained. Leaving the fan on 24/7 ensures cleaner air, as the air is pulled through the filtration or UV light system (assuming you have one of these features). AC fans are more prevalent, so let’s use that as our example; let’s also ignore efficiency and power factors because they’re immaterial. The fan on my Trane outside air conditioning unit is always running. Of course one of the best ways to save money is to regularly maintain your unit. Well, that depends on what special factors you may have in your home. Your air conditioner's fan operates independently from the cooling unit, circulating air throughout your home. These systems are usually “closed loop systems,” which circulate conditioned air (heat or AC) throughout the home via ductwork and vents in the floor, walls and ceilings. Installing an air cleaner is a great idea for these homes, and the quality of the air will be improved by continuous furnace fan operation. Freon Soon To Be Discontinued (R-22) Help for AC Owners. Constantly circulating the air prevents hot and cold spots from forming, so your home will be more evenly cooled. The only way to stop it is when I flip off the power at the breaker box. There are two types of fans – AC and DC voltage. Running your home’s furnace fan all the time is not a bad thing. When your fan is continuously moving the air, it helps to dry it out. In many systems, the blower fan runs a minute or so before heating or cooling begins and ends to get air flowing. Drawbacks to Running Your Furnace Fan Continuously. Your fan limit switch is located inside the furnace panel cover, usually near the upper right corner. For instance, perhaps you have severe allergies. This is a confusing situation when the outside ac unit not running but inside is. When the fan is set to On, it blows continuously, circulating and filtering air regardless of whether the air conditioner is in cooling mode. The other answer I’ve heard is that ‘It costs just as much to run the fan on as it does when the AC is also running,’ but I thought fans require low power so that doesn’t seem to make sense to me, either.”. The average kWh in the US costs about $0.12 so it costs about $43 per month, or about $520 per year, to run a fan continuously. This can be better for people with allergies. Before we begin, it’s important to have a good understanding of the air conditioning system. The only other time your blower fan should be running on its own is if you've flipped the thermostat switch to "on" to temporarily run your blower fan for increased air circulation. AUTO mode = Fan is on only when heat or AC is triggered by the thermostat setting. Bottom line – If you run the fan in AUTO mode, you’ll save about $300 per year. Reasons your AC fan may be running continuously include: The fan is set to ON instead of AUTO; Thermostat is broken ; The outside temperature is high; A relay switch is broken; Short circuit Here are the pros and cons of the ON vs Auto setting on your thermostat. The average unit has a 500-watt fan, which uses almost as much energy over the course of the year as a refrigerator, resulting in a $50/month bill. Therefore, if you run the fan continuously for a 30-day month (720 hours), you would use 360,000 watt hours (720 x 500) or 360 kilowatt hours (kWh). Therefore, if you run the fan continuously for a 30-day month (720 hours), you would use 360,000 watt hours (720 x 500) or 360 kilowatt hours (kWh). The fan only runs when the system is on and not continuously. Less frequent starts and stops of the fan can reduce the stress from startup, and potentially help extend it’s lifespan. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside. Most systems offer two fan settings: On and Auto. You won’t have to worry about the fan wearing out or breaking. Therefore, the fan uses about 360 kWh per month in the ON mode. Let’s start by making sure we’re on the same page with regards to definitions: Let’s also assume we’re talking about a central air system with a blower motor (fan) located inside the home. With a 500-watt motor, this can be significant! Common Fan … Better dehumidification. HVAC in the News: Should I really set my thermostat to 78 degrees? When your system’s air filter is full of dirt and debris, the flow of air is restricted, which can impede the functioning of your air conditioner. Other snafus such as a shorted thermostat wire can also cause the A/C or warm air furnace fan to run continuously. This results in healthier indoor air … This allows you to set the fan on for a certain amount of time every hour. Sometimes the AC’s compressor is not working, but the fan still runs. There is better dehumidification in your home during the summer months. Step 1: Locate your fan limit switch. Pros to Running Fan on Air Conditioner Continuously: Keeping the fan on creates a more even distribution of heating and cooling, circulating the air if you have cold or hot spots in your house, like a bedroom above a garage. PROS – Leaving Furnace/Central Air Fan Run 24/7. Continuous Blower Fan Operation: Why Run an Air Conditioner or Heating Blower Fan Continuously? As a result, the temperature variation is reduced. Inside of your air conditioning unit, there is something known as the ‘blower’. The blower fan in your air conditioning is a separate electrical system from the cooling unit. Therefore, the fan uses about 360 kWh per month in the ON mode. Improve Air Quality. Cons: Higher cost. The house stays nice and cool but the fan doesn't turn off even when I turn off the a/c. The blower will automatically run at different speeds, giving you the benefits of lower electricity bills and increased comfort. Running a furnace fan constantly also has drawbacks. This option is much more cost effective because you are using less energy. That will keep the air in the house mixed up so you don't get hot spots and cold spots. At this point, it should be pretty obvious that AUTO costs less than ON but let’s math it out to its logical conclusion. Less frequent starts and stops of the fan can reduce the stress from startup, and potentially help extend its lifespan. 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