Tip & How-To about Heating & Cooling

Temp cut off/cut in

Any thermostat, it's calibrating to cut off at the end of 2nd beginning and cut in 2nd ending of temp.
Ex: In heat mode, If you set @ 68 degree, it will cut off 70 degree beginning and cut in at the end of 66 degree.
In cool mode, if you set at 68 C degree it will cut off at the end of 66 and cut in will be at the beginning of 70 degree.

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I turned my thermostat down this morning to 68 degrees. I came back about 2 hours later to increase the temp to 70 degrees but when I push the ^ arrow instead of showing the increase to 70 it just flashes the letters HP. I have no owners manual for this thermostat and no idea what this means, other than heat pump. Is something wrong??


Since it's within 2 degrees of your setting it could be one of two things. Most furnaces run longer (pass your setting) to maintain the setting you made. Which really not a problem. However, your thermostat may need calibrating. To test this theory, place a regular wall thermometer next to your furnace's thermostat and see if the two temps match when the furnace cuts on and then when it cuts off.
If the temps are both the same, the furnace thermostat is fine.

If you're turning it down to 68, because no one will be at home during the day, just set it 2 degrees cooler than 68 degrees. You will then wind up with 68 degrees.

Feb 09, 2011 | Heating & Cooling

1 Answer

DT92E room stat appears to be very inacurate with its room tempreture, our normal room temp is about 22c we have to set the stat at 25c to get heat and the stat cuts out after a temp rise of 1c


All thermostat is calibrated @ difference of 2 degree.to cut in and cut off.
In heat mode, if you keep 25 and your room temp 23. it will start at the end of 24 or beginning of 25 degree.Cut off also @27 degree beginning. Please check Tips & how to do's in Fixya

Jan 11, 2011 | Honeywell Heating & Cooling

1 Answer

I just got a new heating unit installed. However it runs constantly. If the target temp is 68 degrees it will hit 68 degrees and just keep running. It does the same at 63 degrees. Is this normal?


Dear friend! Any thermostat, it's calibrating to cut off at the end of 2nd beginning and cut in 2nd ending of temp.
Ex: In heat mode, If you set @ 68 degree, it will cut off 70 degree beginning and cut in at the end of 66 degree.
Hope it's helpful to you?

Jan 10, 2011 | Intertherm Heating & Cooling

1 Answer

why is there such a big temperature gap between on-off. room temperature is either hot or cold. thermostat tried in different rooms and varying temperature settings


Normally all thermostat calibrated at the end or beginning of -2 or +2 degree difference.

I fyou set 24 degree for cool, it will cut off at the end of 22 and cut in at the beginning of 26degree

Jan 04, 2011 | Heating & Cooling

1 Answer

My Trane thermostat (TCONT600AF11MAA) is supposed to have 1.5 degrees of heat pump "rest" above the desired setting before turning on the heat pump. The thermometer reading does not change yet the heat pump cycles on and off in mere minutes. Very expense to operate. Thermostat installed 9-2-2009 as part of the Trane heat pump (4WCC3060A100AA0) package. I live in remote part of SE AZ and the Trane dealer is quite small and may not know as much as he thinks he does. Help!


Friend! All thermostat is calibrated to cut in and cut off at the end of - or + 1 degree end.
Example: If you set 23 degree, it will cut off in 21 degree and cut in @25 degree. So accordingly you set the temp.
Secondly, don't set temp near to your room temp.Minimum difference should be 3 degree. If your room temp 12 degree, set at least 15 degree for heat and if room temp 28, set at least 25 degree for cool.
Hope it's helpful?

Jan 02, 2011 | Heating & Cooling

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