I've noticed my new furnace uses about the same electrical power to operate as my old furnace, even though the new furnace (44k) is 1/2 the BTU of he old one (88k). Both furnaces use 1/3HP 5amp blower motors, old furnace was on high speed, new furnace was on low. New furnace uses a 1.8amp shaded pole inducer motor and is considerably larger than my previous furnace inducer. I didn't get the amp rating on the old furnace inducer, but it was a standard 'c frame' motor, most are about 1amp. Condensing furnaces do tend to use much larger inducer motors overall.

I write this post because I've noticed the increased electrical consumption with lower temperatures. Electrical efficiency isn't mentioned in furnace specs, but it appears to contribute considerably to operation costs.

Views: 92

Attachments:

Reply to This

Replies to This Discussion

Have you looked into any of the ECM motors? I hear they consume less electricity. It would probably take a couple years to pay for itself in savings, but with a new furnace, it may be worth looking into.

http://www.youtube.com/watch?v=YjoY6hRSudk

This motor looks like a good bet.

ECM could be the way to go. At $250 it does have a long payback though. The use of a 1.8A Shaded Pole inducer motor seems wasteful, a PSC would use 1/2 the power to do the same job.

RSS

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Al Heath replied to Bryan Pringle's discussion Dense packed cellulose in basement?
"My favorite was 2x4 directly on cement basement wall, with fiberglass, then plastic inside of…"
6 hours ago
John Nicholas replied to William Fisher's discussion Can tankless water heaters provide hot water even when the groundwater is fairly cold?
"Simple math will tell you.   Figure the GPM requirements for each fixture you think will run…"
7 hours ago
R Higgins replied to William Fisher's discussion Can tankless water heaters provide hot water even when the groundwater is fairly cold?
"I have that problem, 45 to 50 degree ground water, in summer, not that we have much of a…"
16 hours ago
R Higgins replied to Larry Schaffert's discussion How to correctly insulate exterior wall in a 1900 house?
"I'd suggest trying to replicate the existing conditions as much as possible in your rebuild,…"
17 hours ago
Bryan Pringle replied to Bryan Pringle's discussion Dense packed cellulose in basement?
"I am getting a lot of "bad idea" push back on this.  I fully understand that…"
yesterday
Greg Mitchell commented on Larry Ralph Jr's blog post Top 7 Worst Crawl Space Repairs
"Spray Foam should be used in crawlspaces.   To learn about closed cell foam in crawlspaces…"
yesterday
Jerry Lawrence posted events
Friday
Morgan M Audetat replied to Bryan Pringle's discussion Dense packed cellulose in basement?
"Right you are. You have to ask: what will the cellulose contribute.  Here in Minneapolis we…"
Friday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service