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AC control thermostats main programming may have the low cooling setting programmed that way and may need reprogramming to your use needs.
The thermostat also, when programming and setting, the heat setting would need to be set to the lowest minimum setting value. Example: heating minimum setting is set for a minimum of 65*, the cooling cannot be set lower than the heating, include 2-3* margin between the two main settings for cooling and heating settings ranges.
Bottom line: set the heat setting to fifty, then set your cool setting.
gettting it lower would only give problemes like dripping water all over your floors and walls from condensing water on the casing and other parts as they are not insulated for that purpose it could also lead to burning the compressor for having liquid freon entering the compression chamber as liquid doesnt compress, in short its just inst build for those kind of temperatures..
You have a heat pump.
Once the outdoor temperature falls below 36 degrees, heat pumps will sharply lose their ability to heat.
If you are getting a 72 degree indoor temperature when the outdoor temperature is 28-30 degrees, the heat pump is performing up to spec.
On heat pumps, the air coming out of the nearest air vent to the unit should be heated approximately 40 degrees warmer than the air entering the unit.
If you have a 70 degree indoor air temperature, the heat pump should be supplying 110 degree air at the closest air vent to the indoor unit.
Gas heat is a much better heating source where outside temperatures are commonly below 36 degrees.
Even electric furnaces perform better than heat pumps under these conditions.
You may be hearing the fan run. Normally the fan will run 30-90 seconds after the unit has reached temperature to give you the air that you just paid to condition.
If it is actually the a/c running, that is because the thermostat internally reads in tenths of a degree. So when you set it to say 70 degrees, it is really set to 70.0 degrees. The thermostat will show 70 degrees when it reaches 70.5 degrees and continue to run all the way to 70.0 degrees Welcome To the Best HVAC
For beginners, 16 degrees cannot possibly be the temperature you are setting your A/C unit to... and anything below 70 degrees F you are risking freezing up your unit! Sounds like it might be a good time to invest in a new unit?
If this is a newer system there will be a freeze sensor. It may be low on refrigerant. I would check the obvious things first. Are the filters and coils free of debris? Finally only set the temperature to your comfortable temp not lower as this can cause freezing too (generally not below 70 degrees)
If it's not some sort of built in economizing feature, someone else isn't getting up and changing the temperature while you are asleep and the air conditioner fairy is playing tricks, then the control PCB is in need of repair and will have to be repaired through a sears authorized repair center.
I am a bit surprised that it will allow you to set the temperature to a low 70 degrees as this is pushing the limits of an air conditioner. They tend to freeze the coils at around that temperature.