When Do You Use A Whole House Fan?

A whole house fan is typically used in climates where the evenings are cooler than the daytime temperatures, and there is relatively low humidity. Depending on the region you live, a whole house fan is best used in the spring, summer and fall when the air is dry.

The purpose of a whole house fan is to draw cooler outside air into the house, while expelling hot indoor air out through the attic and roof vents. This can help reduce the need for air conditioning and save on energy costs.

It is generally recommended to use a whole house fan during the evening, night, and early morning when outdoor temperatures are at their coolest. The fan should be turned off during the hottest part of the day when outdoor temperatures are high, and the indoor air is warmer than the outdoor air.

However, it is important to note that whole house fans may not be effective in humid climates or during heatwaves when outdoor temperatures remain high at night. In such cases, air conditioning may be a more effective option.