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Heat pump

Discussion in 'Residential' started by pintofstout, Oct 27, 2017.

  1. pintofstout

    pintofstout New Member

    Messages:
    1,538
    Location:
    Olean, NY
    I know bullox about resi, I've got some basic questions. My brother is building a house and I'm getting him equipment. He's getting a 120,000 btu gas furnace and a 5 ton heat pump.

    Actually- why does it seem like heat pumps are always partnered with electric furnaces? Is that like, a thing?. I'm getting gas....

    So the supply house started quoting me a straight AC and then i explained what a heat pump was, they had never heard of such a thing and were shocked to see they had one.....

    Anyway, they switched the condensing unit on the quote but not the case coil. I said i think there's a different coil, there's gotta be a bypass.

    The guy in the office, manager or whatever, he'd heard of heat pumps. Knew all about heat pumps. He came to talk to me. He said it's the same coil. The system shows that is the right coil (i didn't see him check the system at all).

    I said what about a bypass, he said i guess you'd have to add that.

    So- could someone please counsel me?

    Also, the equipment is made by airquest... Do they have a good track record?




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  2. knave

    knave Undeterred

    Messages:
    8,121
    Location:
    Out for a rip
    Don’t know about Airquest.

    Some txv bodies have a bypass built in.
     
    jpb2 likes this.
  3. flange

    flange Act like you care and do SOMETHING!!

    Messages:
    12,839
    Location:
    IMT--in my truck
    never heard of air quest. the area where I live has heat pumps all over. I had a hard time finding a home with boiler and separate dx cooling systems.

    at any rate there are tx valves with built in check valve and bypass. these are bidirectional tx valves used for heatpumps. as to your question, if you plan to use the heatpump as first stage heat then switch to fossil fuel, you will need a special thermostat or dual fuel kit to make controlling it simple. typically they are changed over at your calculated balance point, but some folks just pick an arbitrary number like 40 degrees.
     
    mike1020 likes this.
  4. NZ All Blacks Fan

    NZ All Blacks Fan Just Another swinging Dick

    Messages:
    9,384
    Location:
    West Coast - Canada
    I found me balance point the hard way - had a 3 ton hp with an a coil on top of my oil furnace. I put in a 1/2 hp belt drive fan motor - hp always heated the house even when -15 outside ( ran all the time though)
    change to 410A air handler - and new 3 ton cond unit rework the ducting (improved) and now at +1 hp can't keep up add a 4.8 kw elect heat kit and all better . I also added after the fact about 20 inches of insulation on top of 10 inches of insulation in the attic - so hopefully balance point drops a little. next yr new windows should fix all
     
  5. NZ All Blacks Fan

    NZ All Blacks Fan Just Another swinging Dick

    Messages:
    9,384
    Location:
    West Coast - Canada
    MAKE SURE THE FURNACE HAS A 5TON blower capacity - they can come shipped for different tonnages

    Id also guess trhe furnace 3 inch PVC CPVC vent piping
     
  6. Texas-Tech

    Texas-Tech Official Geezer*

    Messages:
    17,598
    Location:
    duhh
    Why 120,000btu gas heater with a heat pump? Gas is cheaper than electricity, at least here it is. If he is building the house it should be pretty well built, gas heat would be more effecient.
     
  7. knave

    knave Undeterred

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    Location:
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    NG is cheaper here as well.
     
  8. pintofstout

    pintofstout New Member

    Messages:
    1,538
    Location:
    Olean, NY
    I always thought heat pumps were cheaper. I had a boss who used to go on and on about how it's crazy that people don't use them when they so much cheaper. That was Northern Virginia/DC area, maybe that's why


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    Rather B Riding likes this.
  9. Rather B Riding

    Rather B Riding Behind bars

    Messages:
    552
    Why the 120k furnace is what I want to know??? Do they still make a 5 ton drive at 120k. 80%??
    The old way of changing over from HP to fossil fuel was an outdoor tstat. Now you can get a indoor stat with outdoor sensor its all you need.
    Make sure the TXV say with internal bypass or for HP.
     
  10. pintofstout

    pintofstout New Member

    Messages:
    1,538
    Location:
    Olean, NY
    So no heat pump, that's easy

    thanks guys

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  11. Rather B Riding

    Rather B Riding Behind bars

    Messages:
    552
     
  12. pecmsg

    pecmsg Junior my ASS

    Messages:
    20,878
    Location:
    Eastern LI
    No
    No
    No

    Get the heat pump.
    The cost difference is minimal, down the road cost of fuel changes.
     
    jpb2, newtech and Anita sannich like this.
  13. Chuck

    Chuck SSP

    Messages:
    7,829
    Location:
    LAX
    I would get the heat pump too.
     
  14. doc havoc

    doc havoc A cunning linguist

    Messages:
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    Location:
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    X3
     
  15. flange

    flange Act like you care and do SOMETHING!!

    Messages:
    12,839
    Location:
    IMT--in my truck
    depending on your fuel and electric costs they can make sense, especially if used in mild weather then you switch to fossil instead of running toasters for backup. you need to compare prices of kwh and nattie gas. nattie gas wins today but for how long
     
    Rather B Riding likes this.
  16. pintofstout

    pintofstout New Member

    Messages:
    1,538
    Location:
    Olean, NY
    Ooh....ok then. Heat pump it is.

    Thanks for talking me out of the heat pump and into a nice heat pump....

    Lol thanks you guys rule


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  17. Chuck

    Chuck SSP

    Messages:
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    Location:
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    And yes, most coils come with txvs that have internal bypass and won't meter refrigerant in heat mode. Or pistons which allow full flow in reverse
     
  18. knave

    knave Undeterred

    Messages:
    8,121
    Location:
    Out for a rip
    Idk... yeah I get it. But I’ve changed more compressors in heat pumps than in ac. Maybe because it doesn’t get hot here.
     
  19. Chuck

    Chuck SSP

    Messages:
    7,829
    Location:
    LAX
    The way it was there, a heat pump was promised to cut gas usage to nothing so balance points were set extremely low. Those things ran 9 months in heat and 2 months in cooling as opposed to 2 months total for a/c. You're right, the first major repair and all the energy savings were out the window
     
  20. Zman

    Zman Hanging by a Thread

    Messages:
    909
    Location:
    The "I know a Guy" State
    For a few extra Hundred, it's a good backup to have for emergencys,even if Nat Gas is the Primary.
     
    Texas-Tech likes this.