How it Works

Natural Cooling is Ideal for Hawaii's Climate

With our warm sunshine and cool trade winds, Hawaii’s beautiful climate is moderated by the temperature of the surrounding ocean. In most of the state the range between the coldest and warmest months averages less than 10° F difference. In the leeward areas, temperatures in the low 90’s may be reached on several days during the year, but temperatures higher than these are unusual. In windward areas, elevated areas and neighbor islands air temperatures are even more comfortable.

It's Hot in my House!

During the day the sun warms the home. Hot air rises and expands, which means that heat has to exit the home before cooler outside air can come in. Often homes are closed up when we go out for the day, so heat gets trapped inside until we come back in the evening to “air the house out”.

Turning on an A/C means keeping the house closed up, and many local homes aren’t designed for efficient cooling.

Hot Air Out, Fresh Air in.

Turning QuietCool on starts the process of exhausting heat out of the living area and blowing trapped hot-air out of the attic space. This in turn draws fresh air into the home through windows and open doors. Drawing heat up and out (where it wants to go naturally) means that as it draws in fresh air, this very efficient system cools both living space and attic. –That’s why it’s called a Whole House Fan.

Quick & Quiet Cooling

Because QuietCool is ventilating your home three ways, the whole house fan system will work effectively anytime the outdoor shade temperature (ambient temperature) is in the comfort range, which is normally the case in Hawaii.

Because the system is not refrigerating air, it’s a very cost energy efficient way to cool the home. The control switch allows it to provide on-demand ventilation when you want it, and because QuietCool works with open windows it’s a great fit for our indoor/outdoor lifestyle.

What is Thermal Mass Cooling?

Think of your car parked in the sun. If you were to go out, roll down the windows and just sit, notice it won’t cool off. It’s not just hot air, but the seats, dashboard and steering wheel are hot too. Once you start driving, the large amount of air coming in through the windows takes the heat out of the mass of the vehicle. That is thermal mass cooling.

CFM (cubic feet per minute) is the measure of air that is moved by a fan. Fans with a higher CFM can cool an area more effectively. Your QuietCool system is sized to ventilate the air volume of the room every two to three minutes. This allows the system to achieve lower indoor temperatures and cool the mass of the home.

A Proven Solution

Hawaii Energy

Get a $75 rebate on a Whole House Fan that draws cooler, outside air through your living space by pushing the hot air out of the home.

US Department of Energy

A whole house fan provides excellent ventilation to achieve lower indoor temperatures.

Environmental Protection Agency

Whole-house fans are typically used to provide cooling by pulling air through open windows and doors…these devices produce substantial increases in ventilation with outdoor air throughout a house.

County of Hawaii

2020 County International Energy Conservation Code: Whole house fan may be provided for bedrooms and the largest habitable space that is not used as a bedroom

County of Kauai

2020 County International Energy Conservation Code: Whole house fan may be provided for bedrooms and the largest habitable space that is not used as a bedroom


Design and install a whole-house mechanical ventilation system.

Island Cooling provides solutions to reduce energy and cool your home. Let us show you how!

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