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  1. Replies
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    heat pump: electric backup vs gas backup

    When a heat pump starts defrosting, it will activate auxiliary heat.

    If you have electric backup, the electric elements will start producing heat almost immediately.

    But how long does it take...
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    2,090

    How long is the defrost running? If the defrost...

    How long is the defrost running? If the defrost thermostat was stuck, the defrost would run for 10 minutes at a time.
  3. Replies
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    610

    I think it's the other way around. If you look...

    I think it's the other way around. If you look at the spec's for a heat pump, the COP varies with the air handler (combinations with high efficieny ECM blowers have higher COP). And you're assuming...
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    Re: Oh the Humanity!

    But what about all those R-22 condensers out there reaching end of life. The R-22 in those condensers will be reclaimed/recycled. There will be more than enough for the remaining R-22 units to limp...
  5. In my mind efficiency is a bigger issue. At...

    In my mind efficiency is a bigger issue. At 110F ambient temperature which is probably easily reached on roof-tops, there's about a 7% difference in efficiency. And keep in mind that the R410a in...
  6. I don't think you can draw that conclusion. ...

    I don't think you can draw that conclusion. We'll just have to wait for someone to do a similar study for heating with heat pumps.
  7. R410a isn't ineffective above 90 degrees. But...

    R410a isn't ineffective above 90 degrees. But R410a loses both capacity and efficiency faster than R22 as the temperature rises. According to this study, R410a is better at lower temperatures and...
  8. Replies
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    I'll repeat again. The quote was in reference to...

    I'll repeat again. The quote was in reference to DIY'ers. I guess I should have said it explicitly: "a DIY'er is no friend to HVAC contractors".
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    Hold on. You're misunderstanding me. My first...

    Hold on. You're misunderstanding me. My first comment about "HVAC contractor not being your friend" was in reference to DIY'er. HVAC contractors generally don't like DIY'ers. That was my...
  10. Replies
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    I'm talking about cutting corners in the...

    I'm talking about cutting corners in the installation. Something which in the small sample of contractors I talked to was common. I know (believe) there are a lot of good guys out there. But how...
  11. Replies
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    2,505

    I'm a homeowner who successfully went the "ebay"...

    I'm a homeowner who successfully went the "ebay" route. But the key to success is doing your homework. I probably spent close to $200 on books and software and hundreds of hours doing research. If...
  12. Replies
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    Wow, that's a lot. I've got a 4-ton heat pump...

    Wow, that's a lot. I've got a 4-ton heat pump with electric backup heating a 2800sqft house. Since Oct.1, I've used 6935 KWH over 130 days or about 53 KWH/day or 1600 KWH/month. Over that time my...
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    summer = 75F winter = 73F

    summer = 75F
    winter = 73F
  14. If your air handler is providing 1200 cfm in...

    If your air handler is providing 1200 cfm in emergency mode, then with a 15kw heat strip, you should be getting

    (15kw * 3412btu/kw) / (1200cfm * 1.08) = 39.5F

    If you are getting only 20F...
  15. Replies
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    I grew up in the Washington D.C. area, but I'm...

    I grew up in the Washington D.C. area, but I'm now in Washington state near Seattle. My winters are mild but still colder than yours.

    No dual-fuel here - just heat pump with heat strip backup. ...
  16. Replies
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    As a homeowner with the Goodman heat pump...

    As a homeowner with the Goodman heat pump (CPLT48) and variable speed air handler (AEPT60), I think you're making the right choice. My neighbor paid a lot more for his Trane model (though not an...
  17. Replies
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    That thermostat has it's own demudification...

    That thermostat has it's own demudification feature and won't take advantage of the dehumidication feature of the AEPT.

    What that thermometer does is when the humidity is high, it will run the AC...
  18. A bunch of phrases come to mind. - Pot calling...

    A bunch of phrases come to mind.

    - Pot calling the kettle black.

    - Only smart people know how dumb they are.

    - It is better to keep your mouth closed and let people think you are a fool than...
  19. I have a similar sized home (7 year old 2800...

    I have a similar sized home (7 year old 2800 sqft) in the Seattle area. When I did the load calculations on my home last year before replacing my furnace, the number I got was in the upper 30's...
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    If you don't have humidity concerns in your area...

    If you don't have humidity concerns in your area during the summers, then sizing based on heat loss may be more appropriate.
  21. Replies
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    Weekly: ...

    Weekly:

    http://tonto.eia.doe.gov/oog/info/ngw/ngupdate.asp

    Monthly:

    http://www.eia.doe.gov/emeu/steo/pub/contents.html
  22. Replies
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    Boy you really like using lots of significant...

    Boy you really like using lots of significant digits.

    PSE's gas rate will be $1.12858/therm to be exact.

    Dividing HSPF by 3.412 to get COP is one of those standard formulas. But using it to...
  23. Replies
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    I'm nearby in Snohomish County and I would...

    I'm nearby in Snohomish County and I would strongly recommend getting a heat pump with electric backup and forget about the gas furnace altogether.

    My house is about 2800 sq ft, but otherwise...
  24. Replies
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    Heat pump with electric backup is most likely to...

    Heat pump with electric backup is most likely to be the cheapest. It depends on your utility rate.

    http://hvac-talk.com/vbb/showthread.php?threadid=84373
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    Here are average residential propane prices by...

    Here are average residential propane prices by region.

    http://www.eia.doe.gov/emeu/steo/pub/5dtab.html

    Even if you bought during the summer, propane is isn't competitive unless the electric...
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