Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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AC Thermostat is set to 78 but wont cool past 79 or 80

The unit is capable if it because I can also set it to 73 and it will got to 74 or 75, but never to 73. No matter what temperture the AC is set at its always 1 or 2 degress higher than the set temp. We had the AC guy out and he quite rudely said everything is fine. All he did was raise the internal temp of the thermostate up to 78 when it was 74 to verify that it shuts off and said it isnt made to go below 78 in Arizona. So I left it at 78 and then sure enough when the house warmed up to 79 it kicked on and stayed on never going below 79 or a very stuffy 80. So what do I do now, the warranty company I don't think will come again since this is the third call on it in a few weeks, (first time low freon, second time loose wire). He also said he would have to tell the company that the unit is working just fine with a 20 degree temperture split. The unit is a Puron High Efficency unit, which its so not right now since it runs 24/7!

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If your unit is running 24/7 you are either low on charge or the unit is to small for your house.
A 20° temperature difference is about normal for the room air vs the air coming out of the ducts, but the room air and the leaving air should keep getting colder and colder.
An air conditioner should cycle approximately 3 maybe 4 times in an hour if it's properly sized.
As for the thermostat thermometer they are very cheap and are more for reference than actual temperature, so if 78° is not comfortable, then you should set it lower but not rely on thermostat being accurate or what the thermometer is saying as long as it is consistent.
The air conditioner and thermostat can also be set below 78°, there's a lot of people set them at 72° and below with no problems.
the only thing is if you have real low humidity you'll need to watch indoor coil or the suction line (the big line) on your outdoor unit and make sure it doesn't freeze up on you.

Posted on Sep 14, 2009

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Sounds like you might have a faulty tstat, or the only other possiblilty is the internal set point temperature on the tstat may be set to shut your system off when its at that one or two degree mark above your set temp. look for a manual on your model tstat or look it up online and try to get into the installer configurations and make the setpoint differential to 0 degrees

Posted on Sep 13, 2009

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We have this air conditioner in our sunroom. From


I would replace the thermostat.

First - be sure and un-plug the Air Condtiioner from the wall.

When you 'select' the temperture I am assuming you are doing this with a 'knob' of some sort. This knob will be part of the thermostat - therefore it (t-stat) should be simple to identify.

Note: On some - LED/Electronic units - it may be difficult to identify the thermostat.

If, however, you can easily ID the t-stat - then you will have to dismantle the AC unit enough to get to the thermostat; it will be installed on/in the unit with screws of some type.

When you find the thermostat -- simply take the wires off the connections (these are usually - 'female' type spades that slide over 'male' type connections on the switch.

When you remove the wires be sure you mark them in such a way you can replace them on the "correct" terminals of the new thermostat without getting them mixed up.

It will be essential that the new thermostat - (A) physically fit the slot that the old one did, i.e. you can re-install it as the old one was and - (B) that it will have the connections you need - in order to connect your wires correctly.

If you take the old thermostat to an Air Conditioning Supply house they will probably be able to sell you an exact replacement - but in any event - an appropriate replacement - that will work.

good luck!

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