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Comfort Cool 4.0 (3860 Real CFM)

The ComfortCool 4.0 delivers a powerful 3860 real CFM and requires about 5 square feet of net free attic ventilation. It costs about $0.07 per hour to operate and uses 640 WATTS of power. It’s designed to cool two story homes up to 4400 sq. ft. and single story homes up to 3000 sq. ft.

Comfort Cool Fans use a German made motor that is rated for 40,000 hours of operation and come with a 15-year fan motor warranty. The precision balanced, acoustically designed fan blades make for an ultra quiet operation.

*See Pricing Below - Includes Installation

Included (Control & Damper)
Gravity Fed Backdraft Damper
Gravity Back Draft Damper
The industrial grade gravity backdraft damper is included with all ComfortCool whole house fans and is designed keep hot attic air from entering the homes living space when the home ventilation system is not being used.
Single Speed Remote Control & Timer
Single Speed Remote Control & Timer
Our single speed remote control with timer is available for FREE with all Comfort Cool whole house fans. It features an LED display so you can clearly see how many hours (1, 3, 6, 9 hours or ON) it is set to run. This remote also gives you the ability to turn the fan ON…
Upgrade Options
Two Speed Remote Control & Timer
Two Speed Remote Control & Timer
Improve the convenience of your whole house fan with a wireless two speed remote control and Timer. It features an easy to read LED display so you can clearly see what speed the system is set to (HI or LOW) and how many hours (1, 2, 4, 8 hours or ON) it is set to run.
Two-Speed Wall Switch & Timer
Two-Speed Wall Switch with Timer
The Two-Speed Wall Switch & Timer allows you to choose how long to run your fan (1, 2, 4, 8 hours or HOLD) and set the speed (HI/LOW).
Cold Weather Damper (Wall or Ceiling Mount)
Cold Weather Damper (Sold Out until August 14)
If you live in a region of Southern California where it snows or gets exceptionally cold, you might want to consider upgrading your whole house fan with our Cold Weather Damper.  A heavy-duty actuator, which is rated to 45,000 cycles, powers the Cold Weather Damper. The damper door is insulated to R-10 or R-50 and helps…

Assembled in the USA15 Year Limited Warranty

Caution: Make sure the fan you buy correctly states its airflow rating.


Comfort Cool 4.0 (3860 Real CFM):* Includes Installation, single speed remote control and sales tax $2,695.00

Single Speed Remote Control: (No Charge)

Gravity Back Draft Damper: (No Charge)

Optional Upgrades

R-10 Cold Weather Damper (Wall or Ceiling Mount): Available August 14

R-50 Cold Weather Damper (Wall or Ceiling Mount): Available August 14

Two-Speed Remote Control with Timer: $149.00

Two-Speed Wall Switch with Timer:* Wall switch not compatible with remote controls. $149.00

Summer Special: ($200.00)

Total: $2,495.00

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Do-It-Yourselfers, Contact Us For Equipment Only Pricing.

Features & Benefits

Exceptional Power, Extremely Energy Efficient!

The ComfortCool 4.0 whole house fan is a high quality, very powerful and ultra quiet alternative cooling solution. It uses a German engineered industrial grade fan motor that can provide 30% more power while using 1/3 less energy as compared to other industry standard fans.

Extreme Engineering - Built To Last, Extremely Low Noise

These high-end industrial grade motors are built to last and are rated for approximately 40,000 hours of operation. The noise level is also really something to hear – or, actually not hear. At a very quiet 54 dBA on high, the 4.0 is whisper quiet. Every aspect of this system is built to a rigorous specification suitable to demanding industrial applications and is completely maintenance free.

Industrial Grade Back Draft Damper

A fundamental problem with traditional whole house fans was air leakage between the attic and living spaces. This could result in dirty attic air entering your home. The 4.0 takes care of this problem with an industrial grade back draft damper.

Low Profile - High Air Flow Register

The ComfortCool 4.0 comes with a high air flow register that reduces air movement noise through the register. These high-performance grills look great too, so your system looks as inconspicuous as it sounds.
The German-engineered sealed motor and damper never requires lubrication or maintenance of any type.


3860 actual CFM (max), 3187 CFM low speed
20-inch, industrial-grade motorized impeller
Energy use:
640 Watts
6.0 CFM/Watt (max)
54 Decibals (dBA); 52 dBA low speed
Attic seal:
Industrial-grade maintenance free actuated damper
Wireless remote control or wall switch
Low profile, hi-air flow, cube-core aluminum (white)
Fits between 16" On Center joists
Rough opening:
14" x 28"
Required attic venting:
5 sq. ft. net-free
Grille size (outer):
16" x 30"
Damper box size:
28" × 14" × 13.75" (L × W × H)
Unit weight:
74 lbs total
120 VAC, 60 Hz
15 year fan motor warranty. Labor and all other components including ductwork, damper, actuator, remote controls and switches have a one year warranty.

Due to product improvements and equipment upgrades, performance ratings and specifications are subject to change without notice.