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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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    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.
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    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".
  9. Replies
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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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    2,659

    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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    2,659

    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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    1,359

    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
  25. Replies
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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...
  26. Replies
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    Just to reiterate something I mentioned earlier -...

    Just to reiterate something I mentioned earlier - even if propane is cheaper than electric resistance heating, propane backup is most likely still way more expensive than electric backup.

    The...
  27. Replies
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    Compare the heat content of propane with...

    Compare the heat content of propane with electricity.

    A gallon of propane has 91,330 BTU.
    The formula to calculate cost of propane heat is:

    cost per 100K BTU = propane_cost / (0.9133 *...
  28. Thread: new home

    by go_redskins
    Replies
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    1,697

    Try this to see if your heat pump is consuming an...

    Try this to see if your heat pump is consuming an excessive amount of electricity to run:

    http://hvac-talk.com/vbb/showthread.php?threadid=83019

    A properly running 12-SEER 3-ton heat pump...
  29. Replies
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    Re: RH of heat pump

    No, I said heat pump supply air would have higher relative humidity because the temperature is lower.

    Objects/people that are close to the supply register get more dried out with higher...
  30. Replies
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    1,596

    Whatever moisture content that exists in fossil...

    Whatever moisture content that exists in fossil fuel should be going straight outside unless there's a crack in the furnace heat exchanger. If it was entering the home, it definitely wouldn't be a...
  31. Threads like this make me want to avoid R410a...

    Threads like this make me want to avoid R410a (Puron) systems if at all possible. There's no current advantage to using R410a over R22 and you're potentially buying a lot more trouble if anything...
  32. Replies
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    Right. You can use your electric bill to figure...

    Right. You can use your electric bill to figure out roughly how much total electricity you're using for AC. But that doesn't tell you anything about how well your AC is operating. Your AC may be...
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    Someone correct me if I'm wrong, but I believe...

    Someone correct me if I'm wrong, but I believe the SEER rating takes into account the electricity used by the indoor blower motor. That would have to be added to the electricity used by the...
  34. Replies
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    No, but I did say "Of course you have to make...

    No, but I did say "Of course you have to make sure no other electric appliance is going on/off between the two measurements" in the original post. :)
  35. Replies
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    You can, but most homeowners don't have a...

    You can, but most homeowners don't have a ammeter. I posted on another thread that I measured the condenser electric usage using an ammeter and got about 2.94 KW. The electric meter method gave me...
  36. Replies
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    Here's a full picture of the meter. Do you...

    Here's a full picture of the meter. Do you really not have a horizontal spinning disk in the center of your meter?

    http://mysite.verizon.net/res0mwpm/meter_dials.jpg

    [Yea, yea, I'm intermixing...
  37. Replies
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    That's why I emphasized (bolded) the word...

    That's why I emphasized (bolded) the word "approximate". I'm trying to provide a simple way for homeowners to have some idea of how well their system is running.

    This exercise won't "prove" that...
  38. Replies
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    I think this is something every homeowner should...

    I think this is something every homeowner should check. Some people end up paying thousands of dollar more for higher SEER systems. But how do they know if their system is actually delivering the...
  39. Replies
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    You can easily measure how much electricity your...

    You can easily measure how much electricity your AC uses per hour by looking at the spinning disk on your electric meter.

    First you need to find the Kh factor on your meter. Here's an example...
  40. I went from natural gas heat to a heat pump with...

    I went from natural gas heat to a heat pump with electric backup and love it. I keep the house at 73F 24hours/day during the winter and my heating bill was reduced by more than half. With natural...
  41. Replies
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    I've got a little boy. He's only 3. Too short...

    I've got a little boy. He's only 3.

    Too short to pee into the toilet standing up, he sits on the toilet seat and uses both arms to brace himself while he pees so he doesn't fall into the toilet....
  42. Replies
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    My low point in recent years was about 1450 KWH...

    My low point in recent years was about 1450 KWH for a 2 month billing cycle. So that's not really that different.

    Unless you've got some other big electrical appliance that you only use during...
  43. Replies
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    1,693

    What a difference expectations make. I'm in the...

    What a difference expectations make. I'm in the Seattle area where the summers I believe are similar to Toronto's. I have a 4 ton heat pump. My 62 day electric bill ending Jul 26 totaled 1809 KWH...
  44. I'll second cembsee's comment. All of the...

    I'll second cembsee's comment. All of the reading I've done specifically recommended against laying the radiant barrier on top of the ceiling insulation because dust will accumulate and greatly...
  45. Replies
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    Looks like I found my next home improvement...

    Looks like I found my next home improvement project. As soon as I finish converting my vented crawlspace to a sealed insulated crawlspace, I'm putting a radiant barrier in my attic.
    ...
  46. Replies
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    Useful link: ...

    Useful link:

    http://www.overgrow.com/tools/rhumidity.php

    37%RH at 94 degrees = 70%RH at 75 degrees.
  47. Replies
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    Uh oh, I'm in trouble now. I've got no training...

    Uh oh, I'm in trouble now. I've got no training so I probably didn't give the standard answer. But it sounded good to me. I'm just a homeowner in the Seattle area who found the subject interesting...
  48. Replies
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    The way I see it... 1. compressor - increase...

    The way I see it...

    1. compressor - increase refrigerant temperature
    2. condenser - release heat
    3. expansion device - decrease refrigerant temperature
    4. evaporator - absorb heat

    The change...
  49. Replies
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    The one purpose of the compressor is to increase...

    The one purpose of the compressor is to increase the temperature of the vapor.
  50. An approximation of how much power your unit...

    An approximation of how much power your unit should use would be to take the total capacity of your unit in BTU's and divide by the SEER rating.

    For a PHKJ036, it would be:

    36000 BTU/12 SEER...
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