Instructions for Running a Whole House Fan


An option that uses less energy than air conditioning is a whole-house fan, which is especially useful when the temperature drops at night and the air is still warm during the day. Even while these fans do not remove moisture from the air as an air conditioner does, they nonetheless give a significant amount of ventilation all throughout your house. It is highly recommended that a trained and experienced expert perform the installation of a whole-house fan. In addition to needing accurate measurements and the addition of specialised wiring, installing a whole-house fan may necessitate the addition of additional vents in the attic.

  1. If you want to prevent producing a vacuum that is too strong in one particular area of your home, you should run the whole-house fan with the windows open.

  2. Before turning on the fan, ensure that any fireplace dampers are closed. This will prevent the fan from drawing soot into the room.

  3. When the air outside is chilly and dry, especially in the evening when temperatures have dropped, you should turn on the fan that circulates air throughout the whole home. When the temperatures outside are greater than those inside the home, you should turn off the fan throughout the day.

  4. If you want to keep the temperature inside about the same as the temperature outside on a hot day, you should turn on the fan and open the windows. People who are inside may feel more comfortable because to the flowing air, which also consumes less energy than an air conditioner would.

  5. If there are certain areas that you want to cool down, open the windows all the way while shutting the windows in other rooms. This contributes to increasing the airflow in the areas that are most in need of it.

  6. Only timers and thermostats, which are optional, should be used to turn off the fan. It is imperative that you open windows and shut the fireplace damper before running the fan, so do not use the controls to automatically turn it on. Instead, manually open windows and close the fireplace damper.


    Determine the ideal dimensions of a whole-house fan to install in your house by doing the necessary calculations. The amount of floor space in square feet that has to be cooled should be multiplied by the height of the room, measured from the floor to the ceiling. This amount should then be multiplied by anywhere from 30 to 60 air changes every hour, depending on the level of power that is needed. To calculate the number of cubic feet per minute of capacity that is necessary in your house, take the hourly rate and divide it by 60.


    In the absence of adequate ventilation, powerful whole-house fans may cause a backdraft in your heating system (furnace or water heater), which has the potential to drag carbon monoxide into the rooms of your home. Running the fan in an enclosed space with no windows open might potentially cause the fan to overheat.

    Never turn on the ceiling fan while you are using the fireplace in any way, shape, or form.