A whole house fan can be a good investment in Mesa, AZ, particularly when used strategically, for several key reasons:

1. Lower Cooling Costs (Shoulder Seasons & Evenings):

o Whole house fans use significantly less energy than air conditioners (often $0.02 to $0.05 per hour versus $0.24 per hour for a central AC).

o They are most effective during the cooler evenings, overnight, and mornings, especially in the “shoulder seasons” (like late spring, early fall, and winter) when outside temperatures are lower than inside.

o By running the fan during these cooler times, you can often reduce or eliminate AC use during those periods, leading to substantial energy savings on your utility bills. Some estimates suggest a 50-90% reduction in AC runtime during suitable weather.

2. Thermal Mass Cooling:

o Running the fan all night cools down the structure of your home (walls, ceilings, furniture, attic) through a process called “thermal mass cooling.”

o A cooler structure takes longer to heat up the next day, which lessens the load on your AC when you eventually turn it on, making it run less and start later.

3. Attic Heat Reduction:

o The fan exhausts hot air from your living space into the attic, and then out through the attic vents.

o This rapid ventilation helps flush out scorching hot air from the attic, which can significantly reduce the heat radiating down into your living space, further easing the burden on your AC during the day.

4. Improved Indoor Air Quality:

o Whole house fans rapidly exchange the air inside your home (sometimes 15-30 times per hour), pulling in fresh outdoor air through open windows.

o This is great for removing stale air, cooking odors, pet dander, and indoor air pollutants (like VOCs from furniture or cleaning products).

5. Fast Cooling:

o They can quickly lower the indoor temperature by replacing all the hot, stuffy air with cooler outdoor air much faster than an AC unit can cool recirculated air.

Important Note for Mesa, AZ:

A whole house fan is not a replacement for air conditioning during the hottest parts of the summer day. When the outside temperature is extremely high (above your desired comfort level) or when humidity is high (less of a factor in Phoenix, but still relevant during the monsoon), you will need to rely on your AC.

The key is using both systems correctly: use the whole house fan when it’s cooler outside, and switch to AC when it’s too hot outdoors.

Pairing an Attic Fan with a Whole House Fan

An attic fan is a great addition to the whole house fan and AC. An attic fan runs all year long and will lower the temperature of the attic to within 10 to 15 degrees of the outside temperature, which results in less heat radiating down into the house from the attic. Our attic fans are run by an app with temperature and humidity controls built in.

Give us a call today, 623-8696922, and we can get you up and running with a very efficient system consisting of a whole house fan and attic fan.