© Copyright 2020 Hearst Communications, Inc. Most air conditioners are designed to provide air that is about 20 degrees cooler than the temperature inside the home.For example, if the temperature inside the house is 82 degrees, the A/C unit will produce 62 degree air which in turn will cool the house about 1 to 2 degrees each hour. Creating an Indoor Wind Chill. Auto helps distribute air in the beginning of the cooling or heating cycle and then cuts off when the set temperature is reached. Keep in mind that they're doing two separate things. So if youâre not in the room, youâre just wasting energy by leaving the fan on. There are some small wall- or window-mounted models, but the majority are central, whole-house ventilation systems with their own duct system or shared ductwork. If your fan doesn't come with a tight-sealing winter cover, you should either buy one or build one. More vent area is better for optimal whole house fan performance. By moving air over your skin, a fan can lower your body temperature, but will do nothing for the heat inside a room. The auto setting turns the fan on only when the air conditioning or furnace is actively running. Attic ventilation will usually need to be increased to exhaust the fan's air outdoors. To save the most on your cooling costs, run your air conditioner during the hottest parts of the day and let your whole house fan do it's job at night and the early morning. If you switch between air conditioning and cooling with a whole house fan as the summer weather changes, build a tightly sealed, hinged door for the fan opening that is easy to open and close when switching cooling methods. Operating the fan without open windows may also cause the fan to overheat. Whole house fans can be noisy, especially if improperly installed. Never operate the fan at the same time you are using the fireplace. How It Works. Whole house cooling using a whole house fan can substitute for an air conditioner most of the year in most climates. Most systems offer two fan settings: On and Auto . Using a whole house fan reduces the need for air conditioning. All whole house fans should be installed with rubber or felt gaskets to dampen noise. Calculate the appropriate size of a whole-house fan needed to properly ventilate your home. If enough ventilation isn't provided, the fans can cause a backdraft in your furnace, water heater or gas-fired dryer, pulling combustion products such as carbon monoxide into your living space. Installation of a whole-house fan is best left to a professional. Be cautious when operating these large exhaust fans. Although your fan never shuts off, your heating and air conditioning still works fine. It provides good attic ventilation in addition to whole house cooling. When you do turn on your air conditioner (after shutting your windows and turning off the whole house fan), it will work faster to cool your home. And keep in mind, it really doesn't hurt the motor or cost more money, running all the time. The net free area of a vent takes into account the resistance offered by its louvers and insect screens. Advantages of Whole House Fans. An experienced professional should take your attic measurements and install your dedicated circuit wiring and, if needed, your new attic vents. Fuel Efficient & Alternative Fuel Vehicles. This helps increase the air movement where you need it most. Home improvement experts agree that a whole house fan can be run at one-tenth the operating cost of air conditioning, you may be able to reduce your energy costs by 80 percent by installing an energy efficient whole house fan. Without proper ventilation, powerful whole-house fans can create a backdraft in your furnace or water heater, potentially causing carbon monoxide to be pulled into your rooms. Inside of your air conditioning unit, there is something known as the âblowerâ. This whole-house fan is installed on the ceiling between the attic and living space. Drawing cool fresh air in through open windows and exhausting hot stale air out through the roof vents, whole house fans create a fresh and comfortable living environment while they draw heat out of the structure to reduce air conditioning load for the next day. This system works well when the outside temperature is cooler than the temperature inside of your home. Installing a whole house fan by QuietAir fans can significantly reduce your air conditioning bills. It creates true air circulation and, if your fan is powerful enough, cycles and moves the air through the whole home, lowering the temperature and your power bills. Less frequent starts and stops of the fan can reduce the stress from startup, and potentially help extend itâs lifespan. How to Keep Cool While Working in the Attic, Iowa State University Extension: Whole-House Fans For Summer Cooling, U.S. Department of Energy: Cooling Using a Whole House Fan, How to Have Cross Ventilation in a Single-Window Room, How to Get Cool Air From One Room to Another. | Photo courtesy of Allison Casey. Whole house exhaust fans are NOT the same as air conditioners. Turn on the whole-house fan when the air outdoors is cool and dry, particularly during the evening hours when temperatures have cooled. Turn on the fan and open the windows during a hot day if maintaining an inside temperature about the same as the outside temperature is acceptable. A damper would control exhaust air from your home into the attic. An attic fan may not reduce your air conditioning costs, but a whole-house fan is a different story. When used as an air conditioning assist â you would run your whole house fan to quickly reduce the ambient air temperature inside you home and cool the structure. Whole house fans can effectively cool down a house. And if you have allergies, it's better to have your fan running continuosly to filter more air anyway. using a whole house fan at night can eliminate the need to run air conditioning in moderate climates. Turn off the fan â¦ then close the windows and shut off the fan in the morning (8AM), close shades to the south as much as can while still giving good light. Do not use the controls to automatically switch on the fan as it is essential that you open windows and close the fireplace damper before operating the fan. Open windows in your house when operating the whole-house fan to avoid creating concentrated suction in any one spot. Whole house fans ventilate your home by circulating air throughout the whole house, pulling the hotter air out of your living space and drawing in cooler, fresh outside air through open windows. Humidity and the temperature outdoors will determine when it would be more ideal to use your whole house fan over your air conditioner. The air-change rate you will choose depends on your climate and how much you will depend on the whole house fan for cooling. You may be able to use the heating and air conditioning ducts in your home as a means of whole house ventilation. Besides requiring precise measurements and added dedicated wiring, a whole-house fan may require the installation of new attic vents. Open windows throughout the house to prevent a powerful and concentrated suction in one location. Reduced dependency on costly Air Conditioning. Even the lightest sleeper can sun the system all night and never be disturbed. Whole house cooling using a whole house fan can substitute for an air conditioner most of the year in most climates. This is far less than even a moderately sized room air conditioner which would cost close to $1 per hour to run or $10 per day and that doesn't even cool your whole house! If you have an older home with a lot of duct leakage it may not be a good idea to run the fan all the time as it may draw in dirty air from places you donât want. 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. Using the setting during the winter season may also circulate colder air throughout the home. The moving air helps make people inside feel more comfortable and uses less energy than an air conditioner. Super quiet modern engineering advances. You'll need 2 to 4 times the normal area of attic vents, or about one square foot of net free area for every 750 cubic feet per minute of fan capacity. And lastly, fixing this problem, usually isn't an expensive repair. Whole house fans should provide houses with 3Â to 6Â air changes per hour (varies with climate, floor plan, etc.âcheck with a professional to determine what is appropriate for your home). Your Whole House Fan costs about 10c per hour to run. If you live in an area with hot days and cool nights, stop throwing money away on air conditioning and save by drawing the cool night air into your home. Close any fireplace dampers before turning on the fan to avoid pulling soot into a room. Turn on the whole-house fan when the air outdoors is cool and dry, particularly during the evening hours when temperatures have cooled. In most parts of the country (including Colorado), and during most parts of the year, a whole house fan can adequately substitute for an A/C system and provide a lovely living environment. If you choose to run a central air unit, insulating your ducts, and inspecting and maintaining the whole system is important, although it adds to the cost. In addition to whole house fans, the ducts of your central heating and cooling system can be modified to provide whole house cooling.
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