Whole House Fan Ideas? - HVAC - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC


Thread Tools Display Modes
Old 06-15-2008, 10:38 AM   #1
HomeOwner Remodel
Join Date: May 2008
Location: Lake Stevens, WA
Posts: 7
Rewards Points: 10

Whole House Fan Ideas?

I am deeply confused by the whole house fan thing. I live in the Seattle area and right now it looks like if it ever hits 72 degrees again we'll be lucky.

Anyway, I have a heat pump which provides nice whole house air conditioning on those rare days that the temp exceeds 80 degrees, so I don't want to invest a huge amount of money in something that is going to not provide too much value. In fact, in the winter it will be a pain in the neck because it will let my warm air go up into the attic.

The more expensive ones offer a "closure system" so that when it's not running it will stop the air from leaving the house. I guess letting the moisture from the house in the winter into the attic is also problematic.

Here's my idea. Since the attic it vents to is adjacent to the garage, would it be possible to vent it over to the garage instead. That is what if you bought some HVAC flex duct and took it up, then right back down. Would this not help relieve the moisture problem and provide LOTS more air space than trying to pack it into my 4x12 pitched attic? I also see an added benefit in that it could be used to heat the garage as well if I were working out there in the winter.

Would that work? Then could I get away with buying one down at the home improvement store for $265 instead of paying $550 or more?


stevedar is offline   Reply With Quote
Old 06-19-2008, 05:58 PM   #2
Join Date: Jun 2008
Posts: 16
Rewards Points: 10

I hope this isn't too obvious, but a whole house fan only works when it is cooler outside than it is inside. I find you need about a 5 degree difference for it to be somewhat effective, with a 10 degree difference it will be very effective.

Here's what I do. I have an Oregon Scientific weather station thing, which has a wireless remote sensor to put outside. These are about $40 at Target, and the better ones will show both temp and humidity inside and out. Now, if you find it is 80 degrees in the house and 72 or less outside, then a whole house fan will work for you.

If you want a cheap entry into the whole house fan, you can do something similar to what I did, which is to get two cheap box fans. My house is about 1600 sq feet, and you need two fans to really make anything happen. One does not move enough air. These are about $15 each or so. If your windows are big, you can screw the two fans together and put them in one window, obviously blowing out. These can be noisy, depending on the speed. Try to put them in windows so that they are working with the usual wind direction. If you find this system works, you might just stick with it - or you might decide it is worth the $500 for a permanently installed system.

I use the cheap method, because I know it works.


pweller is offline   Reply With Quote
Old 06-20-2008, 01:59 AM   #3
Join Date: Jul 2007
Posts: 36
Rewards Points: 25

I used to have a whole house fan when I lived in Ohio. Worked pretty well, however, those babies move a LOT of air, so I don't know if ducting would hold up. It would have to be a very large diameter, IMHO.
steve771 is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cape Cod Style House Attic/Crawl Space Insulation Help Danielg Insulation 24 05-21-2012 08:20 AM
Connecting main house to guest house... hlavine Building & Construction 31 03-28-2012 09:04 AM
200 Amp service really needed for a 830 sq ft house? overkill? alexz Electrical 7 11-16-2009 05:54 PM
Complete AC installation in Old Capitol Hill Row House jacko10 HVAC 0 09-18-2007 05:42 PM
Will my house make my kids sick??? jokrupinski General DIY Discussions 18 09-29-2006 04:05 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1