4 ms·
Some do, but it's inefficient on a couple of levels. First, the damper to divert air to the attic will never seal perfectly (or at least it won't a short while
by djrogers 8y ago
Some do, but it's inefficient on a couple of levels. First, the damper to divert air to the attic will never seal perfectly (or at least it won't a short while after it's lived in your attic) so you'll always be losing some cooling to your attic when your AC runs. Secondly, the volume of air an AC system is set up to move does not come close to comparing with the amount of air a properly sized while-house fan will move. The blowers are just designed for 2 different roles...
- joezydeco 8y agoYeah, I realize the HVAC blower is smaller than an attic fan. It just seems like having a controlled diverter (blow air to the house /or/ blow air outside) could help draw in outside air when needed. In my part of the country it cools off at night, but the wind typically stalls. At least drawing in some of that air could let me skip running the A/C compressor overnight.
- djrogers 8y agoYes, but that doesn’t change the inefficiencies I mentioned, which are why it isn’t often done. It is done sometimes - I had a home with such a setup - but you’re much better off dropping a few hundred $$ on a proper whole house fan.