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Do Whole house fans really work?

This FAQ will answer most questions we receive about the effectiveness of whole house fans. 

Home cooling

Whole house fans cool your entire home naturally . Certain rooms can be cooled before others if desired. 


Whole house fans cost only a fraction of what it costs to run your central AC. Save money on your cooling bills this summer! 

Eco friendly

Whole house fans use cool natural air rather than stale recycled air from a central hvac system. 

Attic cooling

Whole house fans not only cool your home naturally and affordably they also cool your attic at the same time. 

Show me the money!


Energy SavingS 

The average home AC uses about 3500 watts of electricity. This means it will cost you around $20/day to run your AC during a typical summer day/evening. 

Compare that to a QuietCool whole house fan that uses on average 500 watts of power which will only cost you around $7 to run for 8 hours.


Return on investment

QuietCool Whole House Fans have the quickest return on investment for any green product on the market. Average annual net savings are around $1,200-1,500 which means a QuietCool will pay for itself in under two years on average. 


Additional savings

I'll tell you a secret. HVAC contractors have the highest markup in the business. This means that when you save wear an tear on your expensive central AC system you are saving even more on potential maintenance and repairs by using it less with a Quietcool whole house fan. 

1. What is the difference between Trident and STL?
The Trident Pro and Stealth Pro are very similar. The main difference lies in the motor
technology. The Trident model uses a PSC motor, which offers standard energy
efficiency, while the Stealth model uses an ECM motor which is extremely energy
efficient. The difference between the two is similar to a hybrid vs non-hybrid vehicle; both
are very efficient with one being more efficient. The Stealth model will save the customer
more money in the long run. If the customer plans on living in the home more than five
years, sell them a Stealth model. When running the fans on medium or low, the fan
operates extremely efficiently.

2. How much energy does QuietCool use? Cost per month?
Most people run their fans for 4-8 hours a day during the summer months. For a 500-
watt fan, this would equate to about $.60 - $1.20 per day in California (energy rates at
$.30 per kWh). This equates to about $18-$36 per month. QuietCool uses up-to 1/15 th of
the amount of energy an A/C unit uses. QuietCool fans have one of the fastest ROIs of
any green energy product on the market today.

3. How loud is QuietCool?
QuietCool is very quiet! Our loudest fan is rated at 51 decibels, which is about the same
as a dishwasher. An average A/C intake grille operates at 50-52 dB while our average
decibel rating across all fans is 45 db.

4. What happens if I don't have any windows open?
The system will not work properly because the air must come from somewhere. If the
system is running with no windows open, it can pull ashes from the fireplace.

5. How much ventilation do I need?
We have a simple calculation to figure out how much venting you need for your system.
For every 750 CFM in the system, you will need 1 SQFT of net free vent area.
Example: A Trident Pro has approx. 4800 cfm; to figure out how much venting you will
need, you will need to divide 750/4800= 6.4 sq. ft.

6. What is the difference between the classic series and pro series?
The pro series line of fans come with all the bells and whistles, such as removable grille,
15 year warranty, switch and timer already included in the box. Also, the pro series fans
have more power and speed options.

7. Can I run these fans all night long?
Yes, they’re running on pennies an hour and you will get the benefit of cooling down the
structure of your home, so you don’t have to run your AC nearly as much the next day.
We recommend running the system on high speed for a few hours and then kick it on
low speed and see how cool you can get your house by the next morning. The longer
you run the system the more effective that the structure of your house will be truly cooled

8. What kind of controls do you have?
We have a switch and timer that is included in every box.

9. Do you have a remote?

Yes we now offer RF wireless switches. The RF Switch requires no down the wall wiring, can be used up to 100 feet away, and customers can pair up to 20 remotes to just one fan. This versatile RF Switch can be connected to all QuietCool whole house fans, attic fans, and garage fans, each cooling wonder getting its own personal remote.


10. Is there any maintenance? 
You only need to clean your grille. The grille may collect dust over time. Most people
want to clean their grille every few months. It is dishwasher safe or you can simply take it
outside and hose it off and simply snaps back into place without any screws.

11. Will the fans affect with my insulation?
No, as long as the system is sized properly and is installed at a 90-degree bend angled
slightly upwards. We use this technique to prevent any blown-in insulation from moving
around. If you have a very small attic and your fans are very difficult to suspend slightly
above 90 degrees, you can always buy a few pieces of batt insulation to put over the
blown insulation.

12. Can I hook it up to a thermostat?
No, because you have to have the human element of opening up the windows.

13. Can you direct vent it to the outside?

We do not recommend venting directly to the outside because you want to pressurize
the attic and cool it down. One of the biggest features of a whole house fan is cooling
your attic air by up to 50 degrees.

14. How long does installation take?
Hard wiring a system can take up to 1-2 hours but with new RF switch control you can
install the system under an hour almost every time. No more dropping wire down the wall and spending extra time wiring up the
fan. The fan will come with a 20 ft. power cord making it plug-n-play.

15. Do you have to make holes in the wall? Do you repair them?
Yes. we make a hole in the ceiling for the grille, but it will be covered and all you
will see is our grille. If a switch and timer is installed on the wall that will be a little cut out
for junction box. 99% of installations do not require any drywall repairs but in the event that drywall repairs are needed we can repair them.

16. How big is the grille?
Depends on the size of the fan you get.
Our sizes are: 14 x 14, 14 x 18, 14 x 22, 14 x 30, 14 x 36
They’re all designed to fit 16” on center, the reason behind the engineering design is to
never have to cut any joist or frame any damper box in.

17. Where is the fan installed?
When installing only one fan, we recommend centrally locating the system located,
usually right above the staircase or in the hallway.
When installing a second fan for the master bedroom and doing a zoned system, we
recommend putting the fan in front of the bedroom door or in the master bathroom. The
key is positioning the fan at furthest spot from the windows, this will allow the air to be
pulled all the way across the room allowing you to take advantage the breeze coming
across your bed.

18. Will I feel attic air coming back into the house?
No, as long as you have enough venting for your system. If you stick to the formula of
sizing at 1/750 you will have no problems with air returning back down into your home.

19. When I heat the home in the winter, will the heat go into the attic?
Yes, the fan will bring the air into the attic and warm it up or if you run it to long it can
cool the entire attic by pushing out the warm air through your attic vents. I wouldn’t worry
about this happening because you will never want to run your heater at the same time as
your QuietCool.

20. How do I clean the grille?
If you have a removable grille the middle piece pops right off. On the Classic line of fans
you have to take the screws out with a screwdriver. We recommend cleaning your grille
every 6 months. It is dishwasher safe or even take it outside and hose it off for easy

21. Do you have to have your windows open?
Yes, because that’s where the outside air is going to be drawn in from. You can only
bring as much air in as you can push out. This is why having 2-3 windows open at a time
allows a lot of airflow to come in.

22. Will the fan cool my room if my door is closed?
If you don’t have a separate system for your own personal room, then you must keep the
doors open in each bedroom. We have 6 different ranges of fans in each fan line to
accommodate smaller bedrooms as well as larger units to cool the entire home.

23. Will the fan bring in dirt or dust?
There is so much CFM being moved inside the home that the dust doesn’t have time to
settle. Also, we sell a screen that prevents 99% of all allergens, pollens, and dust from
coming into your home. This product is called PollenTec that is installed in place of your
existing screen.
Will the fan bring in pollen?

There is so much CFM being moved inside the home that the dust doesn’t have time to
settle. Also, we sell a screen that prevents 99% of all allergens, pollens, and dust from
coming into your home. This product is called PollenTec that is installed in place of your
existing screen.

24. How fast is the return on investment (ROI)?
QuietCool fans with a PSC motor (Trident and Classic) have an ROI average of 2 ½
years & the Stealth has an ROI average of 3 ½ years. QuietCool has one of the fastest
ROIs of any green energy product on the market today. With solar, insulation, and
upgraded windows havin a 10+ year ROI, QuietCool is a simple choice. If you finance
the QuietCool system, you will be instantly be putting money in your pocket every month
due to the savings.

25. Do I need QuietCool if I already have solar?
Yes, because you can save a lot more energy and sell that energy back to the enrgy
companies for credit. You also may not need as many panels on your roof which will
bring down the cost tremendously. Your A/C bill makes up 60-80% of your utility costs
during the warmer months and if you can save up to 90% of the usage with a whole
house fan, this will allow your customers with solar to be able to live a much more
comfortable life style.

A big issue going on in the solar industry is that once a homeowner gets a system
installed, they think they can live at a much more comfortable lifestyle by running their
A/C system more often without an electric bill. However, the homeowner will realize the
first month after running their A/C more often that their bill is the same as it was before
solar! The solar system they purchased was sized to accommodate their old lifestyle (eg.
78 degrees) not their new lifestyle (eg. 72 degrees).

26. Do I need an attic fan to remove the air out of the attic, while using the whole house fan?
No, but we always recommend adding an attic fan to your QuietCool whole house fan
system because the attic fan can run during the day and help prevent the attic from
reaching high temperatures. In result, this will allow your whole house fan to run much
more effectively.

27. How does the air escape out of the attic?
The air escapes your attic by the whole house fan creating positive pressure and
pushing the air out of your attic vents.

28. Can the fan use a programmable timer?
No, because a programmable timer works just like a thermostat and you will always
need the human element of opening windows for the system to work properly.

29. Are there rebates for the fan?
Yes! Check your area local area for utility rebates.
We try to maintain a list of current rebates. Please visit our Rebates page for more info.

30. Are there any tax savings with energy?
No, there are not any tax savings benefits with the system.

31. Is there financing available?
Yes! We offer easy financing options through Acima.

32. Do the fans require a permit?
Whole house fans typically do not require a permit, but many times you will have to get a
permit if you’re doing a utility rebate for a customer or if your local building codes require
it. Always check local building codes before installing appliances.

33. Are these fan Energy Star qualified?
No, there is no Energy Star category for whole house fans.

34. How long do the fans last for?
QuietCool fans can last up to 30 years but we lead the industry with a 15-year warranty.
Many QuietCool dealers also offer an extended warranty on all labor and maintenance.
Discuss with your dealer about what warranty they offer.

35. Can I use these fans during the winter time?
Yes, we recommend during the colder months to get a few air exchanges per day during
the warmer times of day to improve the indoor air quality, especially if any family
member had gotten sick recently. This will help keep the home healthy and even warm
the house during the day.

36. How many windows do I need to open?
We recommend to only have 2-3 windows with an opening of 4-6 inches. This will help
maximize your airflow. If you open all your windows it will cool your home but you won’t
feel as strong a breeze as if you only opened 2-3 windows.

37. Can these fans be used in my garage?
Yes, if you open up your garage door you can cool it by simple cracking your garage
door or opening a window.

38. Can I install the fan down stairs?
Typically you cannot install a fan down stairs on a multi-story home because there is not
an attic on the first floor. However, there are some homes that have multiple attics that
could allow this type of installation.

39. Can I wire my controls upstairs and downstairs?
Typically no because of the fire blocks between stories. This can make it very difficult to
retrofit the controls downstairs.
We now are offering the Wi Fi Smart Control that allows customers to control the fan
from anywhere in the home with their smart phone or tablet.

40. How much clearance do I need in my attic?
You will need a minimum of 30” of clearance.

41. How will I know if this fan will fit through my attic access?
Every fan is designed to fit through the attic access or even the ceiling cut out. Simply
remove the duct from the housing and everything will fit right through the ceiling cut out.

42. Can you run the fans during the day?
We only recommend running your fans any time is it cooler outside than inside your
home. We recommend running the fan during the day if it is during the winter months.

43. What will happen if I don't have enough ventilation?
Lack of ventilation is not a serious issue; however, the fan will not perform at the highest
level. When air is pushed into the attic from the fan, the pressure will force some of the
air back down your wall cavities and back into the home.

44. What happens if my furnace is in the attic?
We do not recommend running your furnace at the same time as your fan because you
will be pushing out all the warm and expensive conditioned air.

45. Can I hook it up to my home automation system?
No, you cannot hook it up to your home automation system because you need to have
open windows.

46. Do I have to run a dedicated circuit?
No, but we recommend the higher CFM units (greater than 4000 CFM) to be ran on a
dedicated circuit.

47. Can I run my AC and fan at the same time?
Yes, you can but we do not recommend it because it would be a very expensive way to
cool your home.

48. What if I don't want to sleep with my windows open?
You will have to sleep with windows open but we provide two window locks in every box
to help mitigate security concerns.

49. What if it doesn't cool off at night?
In most climates there are only about 2-3 weeks of the year where it won’t cool off in the
evening where A/C will be the only solution. That makes up about 5% of the cooling
hours of the year. This is how QuietCool can still save you up to 90% off your A/C
related costs.

50. Can you run the system year-around?
Yes, you can run the QuietCool all year long.
One of the big factors is the geographical territory you live in. In dry climates, like
California, you will use the fans a lot more in the spring, summer and fall. Other places
like Arizona, Palm Desert and Nevada you can use the fan every season besides
summer. It will still cut out huge amounts of energy during the majority of the year.

51. What if I don’t have an attic?
When installing a QuietCool whole house fan you will need to have an attic. Our roof
mounted attic fan series is a great option for flat roof homes without an attic.

52. Is the ECM motor quieter than the PSC?
There isn’t a huge difference in sound between the two different motor types but the
ECM motor has a delayed wind up that allows the fan to turn on and off quieter.

53. Do you have roof mounted fans?
Yes. Our Roof Mounted fan series is a great option for flat roof homes.

54. Do the fans work in humid climates?
In humid climates it is typically very humid in the middle of the day with lower humidity
levels at night time allowing you to run the fans effectively overnight. If the humidity level
does not lower during the night, you can even run the fans for 1-2 hours to exhaust the
stale air in your home with the cooler outdoor air and then shut all your windows and
allow your A/C to dehumidify the air.

55. Does it completely replace A/C?
UCLA did a study back in 2012 claiming you can eliminate your A/C usage in 10 of the
16 climate zones in California.
The Department of Energy claims that whole house fan are the most cost effective way
to cool your home.
We believe our QuietCool system is the perfect companion appliance to A/C rather than
a replacement.

56. Is the grille paintable?
The removable egg crate grille comes with a nice white glossy finish. We would not
recommend painting the grille, however, it can be done if you desire.

57. What is the difference between your fans and the fans sold by My Green Home Design?
Our fans are much quieter, more energy efficient, look nicer, and are much easier to
install. Our fans are also rated on the CEC (California Energy Commission) website
while the fan and blade they use are not rated. We also have an R5 rated gravity
damper system which prevents air transfer between the home and attic. Their fans have
no insulation value.

58. What is the difference between your fans and the fans sold by the Whole House Fan

Our fans are much quieter, more energy efficient, look nicer, and are much easier to
install. Our fans are also rated on the CEC (California Energy Commission) website
while the fan and blade they use are not rated. We also have an R5 rated gravity
damper system which prevents air transfer between the home and attic. Their fans have
no insulation value.

59. What is the difference between your fans and the fans sold by Airscape?
Our fans are much cheaper, more energy efficient, and are much easier to install.
Airscape does not include pre-assembled damper boxes (some even take up to 46
screws to install!) and are much more complex.

60. What is the difference between your fans and the fans sold by Comfort Cool?
Our fans are much cheaper and move much more CFM than what they claim on their
website. On their website they inform customers to size 1 CFM per sq.ft., but to truly size
a home it is 2 CFM per sq.ft.

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