Natural Cooling with Whole House Fans A whole house fan is a quiet, natural and pleasant alternative to keep your home cool and comfortable and while saving big on home energy. Whole house fans can reduce or even eliminate air conditioning use by taking advantage of the natural cooling cycles that nature provides. Here's how they work: The whole house fan is mounted between your living space and the attic, and is operated in the evening, night-time and morning, when outside air is cool. The device draws cool fresh air in through open windows while exhausting hot stale air out through attic roof vents. This circulation creates a fresh and comfortable living environment and, importantly, draws heat out of the structure to reduce/delay heat loading for the next day.
		Cool, fresh air is drawn inside while hot, stale air is exhausted through the roof vents.
Much improved over old-fashioned designs Traditional whole house fans are big, noisy and difficult to install. They often require fussy maintenance and are poorly sealed so, in colder climates, can create problems of heat loss and attic condensation in the winter. AirScape whole house fans represent a breakthrough in usability and practicality. They are compact, VERY QUIET, very easy to install and require no maintenance. Plus, they have automatic, insulated doors so they are safe and convenient to use in four-season climates. And total energy use is equivalent to just one or two light bulbs!
		The AirScape's unique design allows for installation within your existing joist configuration.

Great for most climates

While especially effective in dry desert climates, whole house fans can be great in other climates as well, though often in shoulder seasons and/or working in conjunction with AC. We've sold AirScape whole house fans all over the country, including New Orleans, Florida and Maine. AirScape fans use less than one tenth the energy of typical AC units, so in almost any climate an AirScape fan can help reduce your energy consumption while you enjoy fresh, natural breezes rather than recycled indoor air.

An AirScape whole house fan:

Models feature: • exceptionally quiet design • outstanding energy-efficiency • two-speed operation • automatic insulating doors • heavy-duty construction • drop-in installation for 16" or 24" openings (24" for 3.0) • maintenance-free operation • a three-year warranty AirScape 1.0 1000 CFM For Homes Up To 1500 sq ft   rebates available in some areas To learn more and pricing click here AirScape 1.7 1700 CFM For Homes Up To 2500 sq ft   rebates available in some areas To learn more and pricing click here AirScape 3.0 3050 CFM For Homes Up To 4500 sq ft   rebates available in some areas To learn more and pricing click here

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MORE ABOUT AIRSCAPE WHOLE HOUSE FANS

Calculating required air flow

While on the surface it may seem like more cfm equals better cooling, it's not quite that simple. The main function of a whole house fan is not simply to replace hot air with cooler air - it is to cool down the entire structure by drawing off the heat. And this takes time. Even with very high air flow - say 4000 cfm - your house can only shed pent-up heat at a limited rate. So there is a point of diminishing returns that needs to be considered against noise. You reach a point where you could double the airflow, which would quadruple the noise, yet only speed up the cooling process by 20 or 30%. So what's really effective is slower flow over a longer period with quiet operation.

As a rule of thumb, 1000 cfm will work nicely in a 1400 sq ft house. The other rule of thumb is 400-500 cfm per bedroom being ventilated. For larger homes, multiple units can be installed or the 3.0 WHF.

Operating sound levels

While traditional whole house fans can be very noisy, the computer room fans used in AirScape designs are quiet and efficient. However there is inevitable noise generated by moving high volumes of air. Again, this is where a dual-speed unit can really help. Sound levels at slower fan RPMs are geometrically lower than at high RPMs, so having a low-speed setting for night-time is important if you are sensitive about noise and/or sleeping in close proximity to the fan. Remember: Cooling your house through the night is the key to saving energy and keeping cool with a whole house fan. There is no fan on the market that will do this more effectively than the AirScape 1.7. To help you relate to this, we have produced sound samples of our units for you to compare. Keep in mind these cannot replicate how the unit may sound in your installation and are meant as a relative guide only.

Cool climates require leak-free seals for the winter months

This is an important special consideration if you live in a seasonally cold climate. In winter months, when your indoor air is warm and moist compared to outdoors, you do NOT want any air leaking into the cold attic, so the fan unit must provide a positive air seal. Otherwise, not only would you waste energy heating an uninsulated attic, but the moist indoor air would condense on the cold attic surfaces creating potentially serious water, ice and mold problems. AirScape units provide reliable positive seals to protect your home during the heating season.

Energy efficiency

The whole house fan is inherently an energy-efficient device, and AirScape is the leader in energy efficiency. For instance, the AirScape 1.7 uses just 140 watts to push 1700 cfm - compare this nearly 280 watts for a competing 1600 CFM fan, and with the 3300 watts required for a 3 ton AC unit!

Durability/Reliability/Warranty

A whole house fan is one of those things in life that you just want to work - no maintenance, no breakdowns, no hassles. AirScape units come with a 3-year warranty. As well, the modular design means a faulty component can be swapped on site rather than having to ship the unit out for repairs.

Does it need maintenance?

Most traditional whole house fan designs require periodic maintenance, which can be challenging depending on your attic access. All of the fans we sell are maintenance-free - the fans are sealed and permanently lubricated.

Controls/switches

AirScape units can be controlled wither with hard-wired switches or optional remote control.

Physical requirements

The new compact multi-fan units are designed to fit into standard rafter configurations. Near the top of this page is a picture of an AirScape 1.7 as it would sit in the framing of a typical attic.

Make sure you have adequate roof venting

A whole house fan depends on existing roof vents to exhaust air. If there is not enough venting a positive pressure build-up forces hot, dusty attic air back into the house through light fixtures and other cracks. How much venting do you need? Provide one square foot of unobstructed venting for every 450 cfm. Double that if the venting is obstructed by insect screening, louvers, etc. So a 1700 cfm fan would require approximately 4 square feet of unobstructed roof venting. See the table at left. If your house does not have enough, extra roof vents can be added for relatively little expense in most cases.

Tips for using a whole house fan effectively