AC thermostat ??

Discussion in 'HVAC Heating & Cooling' started by rayh78, Jul 17, 2011.

  1. rayh78

    rayh78 New Member

    Messages:
    78
    Location:
    Virginia
    Have a rental property been working on that now vacant. Janitrol 2 ton heat pump about 6 years old.
    Noticed I would temp at 84 when I left at night. Following morning I get there and the actaul temp reads 77. Look like a cheap no name thermstat so replaced with a used Honeywell that worked good before. Had stored in my shed because switch to a programable one in my own home.
    This seemed to work fine for days. When there working during the day I turn down to about 77 and then back up when I leave to about 84. Then a few times found the place at 77 the next morning. According to the display and verified with a laser therm I have.
    Called my AC guy. He saids it has to be the termostat.
    So buy a new honeywell thermostat and install. A few days later its doing the same.
    Either something wrong my AC guy does not know about. Or at night when I leave its able to hold the 77 temp without the ac cutting on for 12 hours with the thermstat turned up to 84.
    It does seem to turn on and off like it should during the day when working there.
    Does this make any sense?
    thanks
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,890
    Location:
    NW Ontario, Canada
    I don't know what overnight temps are like there but it is possible that it is simply holding the temp. You could of course disconnect the thermostat or flip off the breaker when you leave to see. Some smart theormostats will keep stats on usage so installing a smart stat could tell you if it's running at night. You could also leave some tissue paper on the air registers and see if the fan blows them off.
  3. DonL

    DonL Out of the Trades

    Messages:
    3,892
    Location:
    Houston, TX
    If it is a smart thermostat.

    Once you set the temperature you have to hit the "Hold Temp" , or it will revert to "Run Program"
    Last edited: Jul 17, 2011
  4. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,890
    Location:
    NW Ontario, Canada
    I can see nothing in the OP that would suggest he has a smart programmable thermostat.
  5. DonL

    DonL Out of the Trades

    Messages:
    3,892
    Location:
    Houston, TX
    I guess that I assumed it was.

    Sorry, Bad Me...
  6. rayh78

    rayh78 New Member

    Messages:
    78
    Location:
    Virginia
    Yes, just NON programable
Similar Threads: thermostat
Forum Title Date
HVAC Heating & Cooling Looking for simple programable one day thermostat Apr 10, 2014
HVAC Heating & Cooling Thermostat Wiring question Feb 14, 2014
HVAC Heating & Cooling Connecting the "Fan "Only" on Thermostat Dec 11, 2013
HVAC Heating & Cooling How to wire a new thermostat Nov 3, 2013
HVAC Heating & Cooling Thermostat for outdoor boiler Oct 20, 2013

Share This Page