Southern California

Bay Area

QuietCool Fans

Trident Professional Series

Trident PRO 7.0X

Trident PRO 6.0X

Trident PRO 5.5

Trident PRO 4.8

Trident PRO 3.3

Trident PRO 2.5

Trident PRO 1.5

Stealth Professional Series

Stealth PRO 7.0X

Stealth PRO 6.0X

Stealth PRO 5.5

Stealth PRO 4.8

Stealth PRO 3.3

Stealth PRO 2.5

Stealth PRO 1.5

 Specialty Fans

Garage Fan GA ES-1500

Roof Mount RM-ES2200 

Fan Selection

I’ve installed more than a THOUSAND QuietCool fans and learned a few things. Some of the “conventional wisdom” seems helpful and some doesn’t.The single most common concern customers have is how to choose the appropriate size fan for their home. Below are some things I have learned

What size is your home?
classify homes into three categories

Size of Home:

Up to 2,000 sq ft
2,000 – 3,500 sq ft
3,500 sq ft and above

Recommended Fan Size:

3,000 – 4,800+ CFM
4,800 – 6,400+ CFM
More than 6,400 CFM

One story or two stories?

-Single story homes need larger fan systems than two story homes.
-Heat concentrates in the second story, leaving the downstairs relatively cool.
-Single story homes have larger roofs, providing more surface area to collect heat from the sun.
-Single story homes have larger attics, enhancing heat transfer into the living space.

What area do you live in?

Coastal communities and hillside communities (San Diego, Orange County, Big Bear) require smaller systems because summer evenings are cooler and there is less heat buildup in the home. Inland valleys (Ontario, Riverside, Hemet) require larger systems because there is a smaller difference between daytime highs and night-time lows. More outside air needs to be pulled through the house to cool it down.
Additional factors

Sound levels:

QuietCool fans are all very quiet as compared to traditional whole house fans. Within the product line, there are ways to optimize a system for further sound reduction, however this usually translates into a higher up-front cost. 

QuietCool Fan Sound Levels

STL PRO 1.5:  43 db STL PRO
2.5: 42/45 db STL PRO 3.3: 42/48
db STL PRO 4.8: 41/43/51 db
STL PRO 6.5: 43/45/48/50 db
TRI PRO 1.5: 43 db TRI PRO 2.5: 
43/45 db TRI PRO 3.3: 42/48 db
TRI PRO 4.8 48/51 db TRI PRO 
6.5 44/46/48/50 db ES-1500: 43 
db ES-2250: 45 db ES 3100: 48
ES-4700: 47/51 db ES-6400: 
47/50 db CL-1500: 43 db CL-
2250: 43/45 db CL-3100: 42/48 
db CL-4700: 48/51 db CL-6400: 
47/50 db

Comparative Decibel Levels

20 db – Whisper, empty theater, ticking of watch 30  db – Recording studio, quiet conversation.40  db – Average residence, normal private office, Library. 45  db – To awaken a sleeping person, bird calls. 50  db – Normal office noise, quiet stream. 60 db – Air conditioning unit at 100 ft., Background music. 70 db – Average radio, normal street noise. 80 db – Noisy office, garbage disposal, alarm clock, police whistle. 90 db – Levels above 90 regularly cause ear damage.

A general rule is that quieter systems are used more. Increased use of a QuietCool system translates into increased comfort and savings, so it is generally better to go with a quieter system.

Zone control:

Installing multiple smaller fans has several benefits.

-Bedroom privacy: The bedroom fan may be operated with the door closed.
-Less noise: Multiple smaller fans produce less sound than a single large unit.
-Energy savings: Just like with sound, the total cost of running two smaller fans is less than one large fan.

Energy efficiency: In addition to the energy savings already provided by using a whole house fan, QuietCool offers the Energy Saver and Stealth lines of fans. These models use advanced ECM brushless motors that consume even less power.Attic Ventilation: Sometimes we run into the problem of not enough attic ventilation. Usually this does not occur if we stay within the size parameters described here but because houses vary, we cannot guarantee it won’t happen.Add more vents: The best solution is to add more vents because, if your attic doesn’t have enough ventilation to handle a QuietCool fan it most likely means your attic is under-ventilated.O’Hagin Vents: These are the most popular. You see them all the time in new construction and probably didn’t realize they are attic vents. They are affordable and won’t leak when installed. We charge a flat rate of $200 or less per installed vent, depending on how many are needed.

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Click HERE to learn about QuietCool Fan Installation Prices

Southern California


Bay Area


Gable Vents:

Gable vents are a great solution for houses that can use them. They are affordable to install and don’t require a roof penetration.

Solar Attic Fan:

Solar attic fans have been seen on home improvement television shows. They are a good solution but are more expensive to purchase and to install. (Installation usually involves cutting roof tiles.)

Use smaller fans: Where installation cost is the most important factor, it may be best to install a smaller fan so as to not over-pressurize the attic. The downside is that it will simply take longer to cool your home. A smaller fan works just like a big fan, it just doesn’t move as much air.One advantage to this approach is that in the future you could add another fan when it is feasible.Use roof mounted fans: QuietCool produces two roof mounted fans intended for applications where there is limited attic space. This is usually the most expensive route to take but in some situations it is the best option.
Other Factors

Hallway heaters: If your furnace is located in the hallway of your living space, you will need to ensure there is a tight seal around the door to the furnace. These furnaces usually have a “breather” vent to the attic from where the furnace gets its combustion air. If the door to the furnace closet is not sealed, attic air may be pushed through there back into the living space.Water Heaters: Your water heater MAY NOT be located in the same space as the whole house fan intake or output. This is vital due to fire safety.