Attic Ventilation? - Building & Construction - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction


Thread Tools
Display Modes
Old 07-04-2012, 12:54 PM   #1
Join Date: Jul 2012
Posts: 3
Rewards Points: 10

attic ventilation?

First a bit of background...

2 years ago this fall I had a new HVAC system put in my house. Since I had put it installed in the fall, I didn't get much of a chance to use the AC.

The next spring I installed new shingles on the roof. There was an existing powered attic fan that was no longer working. I decided to pull it out and install a continuous ridge vent instead.

Then as the heat of the summer started, I was under whelmed with my new AC's ability to cool the house. I feel the old AC when it was functional, did a quicker/better job of getting the house cooled down.

The company came out to do an assessment to see what could be done to improve my AC. The owner of the company mentioned that a powered attic fan was equivalent to 0.5 tons of cooling. (Although their sizing calcs did not include a powered attic vent.)

Anyways, I have been thinking about re-installing a powered attic fan. What do you guys think? Will an attic fan help?

Will the ridge vents pose a problem (intaking air from the ridge instead of soffits)? I read a product review on an attic fan and the guy said that was a problem (at least with that model...although I doubt it would matter which model). At the same time, heat rises I have to figure it doesn't matter where the air comes from as much as just getting the hot air out of the roof peak.

Any suggestions on a model?

Are the solar attic fans any good? I already have power there, so its not a big deal one way or the other, but I am all for saving a few $$ on the energy bill.
jimsflies is offline   Reply With Quote
Sponsored Links
Old 07-04-2012, 02:11 PM   #2
Residential Designer
AndyGump's Avatar
Join Date: Sep 2010
Location: Orange County CA.
Posts: 1,479
Rewards Points: 874
Send a message via Skype™ to AndyGump

My opinion is for you to save money on not buying a useless attic fan and instead spend the money on sealing the air leaks from the ceilings to the attic space and install more insulation.

Of course this is all very generic advice form someone that does not know where you live and has not made a study of your house energy needs.

Residential Drafter/Designer
AndyGump is online now   Reply With Quote
Sponsored Links
Old 07-04-2012, 05:34 PM   #3
Join Date: Dec 2008
Location: Fairbanks, AK
Posts: 1,933
Rewards Points: 1,172

Powered attic fans create a negative pressure in the attic, encouraging conditioned air to leak in and bring water vapor with it. I suspect that is why Andy suggested not using one. Do you have soffit vents as well? Yes, air seal and insulate w/ cellulose.
jklingel is offline   Reply With Quote
The Following User Says Thank You to jklingel For This Useful Post:
AndyGump (07-04-2012)
Sponsored Links
Old 07-04-2012, 06:18 PM   #4
Join Date: Nov 2011
Location: Hartfield VA
Posts: 36,401
Rewards Points: 17,940

Agreed but if there is not enough soffit vents or there blocked with insulation no amount of venting will work correctly.
joecaption is offline   Reply With Quote
Sponsored Links

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
Attic ventilation tmaher HVAC 5 06-09-2011 10:54 PM
Improve attic ventilation? Greenmaze Roofing/Siding 28 07-22-2010 02:16 AM
Attic Ventilation. Just double checking before I start ... :) matjam68 Roofing/Siding 11 03-16-2010 08:38 PM
Powered Attic Fan question spup345 Roofing/Siding 9 06-30-2008 08:10 PM
Proper Attic Ventilation kmhill35 Roofing/Siding 2 04-01-2005 08:11 PM

Top of Page | View New Posts