A lot happened in 2016 – now for 2017

NEWS! UPDATE MAY 2017

INVISCO HAS THE FIRST ROOFTOP WHOLE HOUSE FAN FOR HOMES WITH NO ATTICS PULLING 8000 CFM. SEE THE NEW PRODUCT HERE:Rooftop

INVISCO HAS THE FIRST AFFILIATE MARKETING PROGRAM FOR WHOLE HOUSE FANS.  See more here

FIELD CONTROL NOW OFFERING VENTCOOL WHOLE HOUSE FANS THROUGH JOHNSTONE SUPPLY.

QUIETCOOL IS NOW SOLD BY HOME DEPOT.

INVISCO IS GETTING A $20,000 INVESTMENT BY IDEABUYER.COM TO TAKE THE NEW TORNADO ROOFTOP WHOLE HOUSE FANS TO STORES NATIONWIDE.

November 15, 2016: Invisco announces the new rooftop ER8000. And Invisco announces upgraded rafter mount, the new ES-6400. CFM is now the highest in the industry from one motor and blade. Only QuietCool has this much CFM but they need two motors and blades to do it.

Airscape’s highest CFM is 5064
Tamarack’s highest is 3400
Centric Air is not over 3860
Ventcool max is 5064

The history of whole house fans starts way back in the late 1800s when there was no air conditioning systems. As an example, I was called by a young man in Atlanta GA who said he was renovating a home built in 1902 that had a huge 50 inch diameter fan up over the upstairs landing. In those days big fans were the only way to effectively create a breeze in every home.

It was not until about 1930 that Mr. Carrier invented the first air conditioning system to compress coolant and then expand it to cool air. Carrier Corporation is still one of the leaders in hvac.

Until just about 15 years ago all we had were the big propellers in the ceiling. Then some alternative systems started showing up. Two young electricians in Southern California had been installing the Home Depot systems and they came up with a brilliant idea – instead of having one central machine, make smaller systems that are sized for one bedroom. Thus QuietCool was born and they have dominated the “rafter mounted” market ever since.

The most interesting debate is over how many CFM you should buy for YOUR home. I did a study of the different suppliers using my 2800 SF home as an example. Suggestions range from a low of 2700 CFM from CentricAir to a huge 14,421 CFM from Breezepower in Australia. Airscape says 2000 to 3510 if you are in the west or 2800 to 7,020 if you are in the midwest. Tamarack says you need 6 air changes per hour so for 2800 SF they recommend 2200 CFM.

One fact is irrefutable. You cannot have too much air flow within reason.

Here is an interesting factoid – if you open a 2 foot high window 6 inches, the opening is 1 square foot. If you have a 4000 CFM fan with only that window for air, the air coming in is 40 MPH! That’s right – 6,320 CFM will be 63 MPH!