Question about Honeywell Programmable Thermostat Heater

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I set the Hold temperature to 78 degrees but the room temperature has now climbed to 84 degrees. Thermostat issue or air conditioning issue?

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  • 135 Answers

Is the air coming out of the vents cool? There should be roughtly a 20 degree difference between the air going into the return air vent and the air coming out of the supply vents. If this is close, then it could be a thermostat issue, but check your air filter, make sure that the return air vent is not blocked, and all supply vents are open. If you had to fix any of the above, the indoor coil might be iced up and if that is the case the air flow will be greatly reduced.
Turn off the A/C and let it set for a 24 hour period, or turn it to off and then leave the fan only on, overnight. Then try again, if it's iced again then you will problably need a tech to look at it,
But to me it sounds like an A/C issue.
If this has been helpful, please rate me, and also contact me back with any questions, that you have.
Sincerely,
Paul Gibson

Posted on May 03, 2010

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What does -AC on honeywell chronotherm III thermostat mean?


AC means "air conditioning." If the AC icon is showing on your thermostat it means that your air conditioning is activated and should come on when the temperature threshold you've set on the thermostat is reached.

For example, if you've set the temperature level to 78 degrees, when the house temperature goes above 78, usually by about two degrees, the air conditioner should cycle on to cool it back down to 78 degrees at which point it will then turn off.


This information should be in your air conditioning/heating system or thermostat owners manual. If you don't have the manual, you should contact your air conditioning dealer or your builder to secure a replacement. The manual is essential for proper operation and maintenance of your system.

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Your question is phrased a little odd.

1) If when you say 'thermostat' - you are actually talking about a 'temperature reading' on your thermostat - then I would tell you to just get another temp measuring device and double-check the temp.

2) if howerver you are talking about the set-point of your thermostat - for example - you might have it set on 70 degrees and the room temperature is 78 - then I would say that the AC is not big enough to pull the temp down to 70 in the room, or, you have a problem with the AC that does not allow the unit to pull the temp down.

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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.

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What setting you use depends on your personal taste of temperatures and the temperature inside vs outside. If you set the thermostat to 72 degrees and it is more than that outside then I would use the exhaust setting. If you set it to 72 degrees, and it is 68 outside but 84 inside then I would set it onto intake to cool the inside air.

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Your filter is clogged. Not the one at the bottom of the unit.The one above the unit. It is like a raditor coils, kind of a bear to get to. We have cats and dogs the filter gets most of the hair but not all.Usualy about 6 bolts to take out.The proublem will be at the bottom of the top filter.

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