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Thread: Which thermostat will work with your system?

  1. #7
    HVAC Thermostat Specialist

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    Either one would be a good thermostat for your application.





  2. #8
    Junior Member

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    Quote Originally Posted by hvactechfw View Post
    Either one would be a good thermostat for your application.
    Thanks, but this not terrible helpful. I know ecobee needs C wire. I have spare blue wire but not sure if itd actually have any voltage. Is there easy way to check?

  3. #9
    HVAC Thermostat Specialist

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    Well, with either thermostat it would be a good idea to use a C connection. And if there is an extra wire then it is likely that you would likely need to connect to the C terminal on the furnace control board. As far as testing it goes..... do you have a volt meter and know how to use it?

    Both are good thermostats. Proportionally, on your type of system, neither one would be better than the other in your application.


  4. #10
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    I'm looking for info on the proper TYPE of thermostat for my system .. I started looking at the Honeywell TH8110 (and the Trane comparable TCONT800) but am slightly confused with them. My goal is to get a programmable thermostat that won't use the aux heat as much as we are using but lowering the temp at night (we like cool sleeping) and upping it SLOWLY in the a.m. There are times when upping the temp ONE DEGREE, the aux heat comes on - because it's COLD outside ? The Honeywell (and maybe others) has the ability to start running at (example) 4am so the correct temp is available at the wakeup time (7am)

    My outdoor unit is a Goodman GSH130361AC
    I do not have any info on the 'indoor' unit - would this possibly be in the crawl space under the house ?
    The current thermostat is a RobertShaw ( and the inside cover says "Item 9520" but the website doesn't recognize this number.





    In reading info (I think the Goodman site), my unit appears to be a "1H/1C" unit - so I ordered the Trane thermostat. However, the wiring info states 1H/1C without aux heat. The PDF files for aux heat reference (multiple)H/(multiple)C systems.

    So - with this limited info, can you possibly tell me the TYPE of thermostat that I need?

  5. #11
    Junior Member

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    OK - so I did some looking and reading and now believe that I have a 3H system ... Heat Pump, Auxiliary Heat, and Emergency Heat ...

    The appropriate thermostat for this would appear to be the Honeywell TH8320 (3H/2C) with Adaptive Intelligent Recovery (that's the phrase I couldn't remember this morning.)





    My remaining question now would be - what are the TWO cooling cycles?

    edit: forgot to add the Air Handler Unit is a Goodman ARUF3642
    Last edited by gdsmith56; 01-30-2015 at 02:11 PM.

  6. #12
    Administrator

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    Quote Originally Posted by gdsmith56 View Post
    My remaining question now would be - what are the TWO cooling cycles?
    Two stage cooling = a system with two compressors or a signal compressor with a unloader. Looking at your thermostat wring and your outdoor unit wiring model number your system only has one stage cooling. You can use the Honeywell TH8320 and just not wire the Y2 terminal.

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