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Thread: HP OR A/C

  1. #1
    Join Date
    Oct 2005
    Posts
    14

    Question

    I am thinking about switching out my outdoor a/c unit to a
    hp. I have a furnace upstairs. I know I need to duel fuel
    tstat what else would I need to install? All Carrier equipment.

  2. #2
    Join Date
    Jun 2003
    Location
    Florida
    Posts
    9,548
    a licensed contractor.
    If everything was always done "by the book"....the book would never change.

  3. #3
    Join Date
    Oct 2005
    Posts
    14

    Wink

    not any easier I just didn't want it to get confusing.

  4. #4
    Join Date
    Jul 2004
    Location
    Southern Alabama
    Posts
    448
    Smokin said it simply and correctly....

    There are too many things that have to be looked at.

    Heat pumps are more than glorified A/C units. They must be properly chosen for the application.

    A load calculation should be performed to determine the proper heating and cooling capacity needed.

    The duct work needs to be looked at to determine if it is sized properly to handle the increased airflow that the heat pump needs compared to fossile fuel furnace.

    Also, the indoor air handler probably needs to be replaced because the indoor coil should be matched with the outdoor unit.

    A dual fuel t'stat is the least of the concerns. I would call a Carrier dealer and see what could be done with what you have.

  5. #5
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Originally posted by serv it
    I am thinking about switching out my outdoor a/c unit to a
    hp. I have a furnace upstairs. I know I need to duel fuel
    tstat what else would I need to install? All Carrier equipment.
    What model numbers do you currently have??

  6. #6
    Join Date
    Sep 2005
    Location
    Ontario
    Posts
    19
    posted by on call
    Heat pumps are more than glorified A/C units ...
    A load calculation should be performed to determine the proper heating and cooling capacity needed ...

    The duct work needs to be looked at to determine if it is sized properly to handle the increased airflow that the heat pump needs compared to fossile fuel furnace.
    I am in the same AC versus HP selection process.

    Why the increase in air-flow for a HP? How much more than the typical 350-400 cfm/ton for AC?

    I suspect that most buyers select HP as an energy efficient addon to their AC purchase. Hence not as interested in up-sizing for the HP requirements.
    The balance point for switching over to gas is whereever it ends up so long as its within the HP operating range.

    In my particular case the hvac-calc heat loss matches the 3ton output at 28F for my house.

  7. #7
    Join Date
    Feb 2005
    Location
    Dothan, Al
    Posts
    3,453

    serv it

    You have to have a heat pump indoor coil to be a heat pump - to go with the heat pump outdoor unit.

    Hope this helps,
    Richard

  8. #8
    Join Date
    Aug 2002
    Location
    Office and warehouse in both Crystal River & New Port Richey ,FL
    Posts
    18,836
    Typically the air flow needed for cooling will be the same required for the heat pump,the furnace may well require more Cfms(air flow).



    Many Carrier coils work for both cooling and heat pump,but have them check for sure.

  9. #9
    Join Date
    Oct 2005
    Location
    Tempe, Az
    Posts
    7
    Why are u guys so scared of heat pumps? Phx Az this is in 80% of the houses. We do gas furnaces as well. The onl;y thing funny about the heat pump is that it only puts out 95- 100 dgree air. Your body temp is 98 degrees, so it feels like cool air, but in essence is doing just what it was supposed to do.

  10. #10
    Join Date
    Jul 2004
    Location
    Southern Alabama
    Posts
    448
    I don't see where anyone is scared of heatpumps here. In fact, I absolutely love them.

    It is just that I see way too many applied or installed improperly. Whenever I talk to someone who hates HPs, I can trace the root-cause of their dissatisfaction back to the two reasons given.

    The thread starter talked about wanting a HP system and talked about changing the OD unit. For a PROPER HP application and installation the person(s) doing this must have experience with them.




  11. #11
    Join Date
    Oct 2005
    Posts
    14

    THANKS A BUNCH.

    Thanks for the info. I did check on the cooling coil with
    Carrier and my co-workers. One of our suppliers suggested the right tstat to go along with the outdoor thermistat.
    all included within the box. Thanks for a the great info.
    I got alittle concerned when someone discussed ductwork,
    I didn't want anyone to think that this was a diy. I work in the field, but have limited knowledge. I am definately
    going with a professional. Hell when you want your teeth fixed you go to a dentist right. Thanks for the help.

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