A whole fan can cool your house off on those summer days in a matter of minutes.
Now if it’s hotter outside of course you wouldn’t want that hot air in just yet. A whole house fan would be needed once it cools down outside and bring in the cooler air and suck the hot air out of your house.
How it works. By placing the fan up in the ceiling of the top floor so it will vent into the attic. This will force all the hot air out the roof and soffit vents. Of course, you’ll need to have them already. Most newer homes already have them. More than likely if your roof was replaced in the last 20 years you’ll have a ridge vent. So chances are you have them so no worries.
The wiring… These fans use 120 volts and about 10 amps for the bigger ones. The fan shown in this video uses a three-wire from the switch to the fan motor allowing it to have two speeds, low and high.