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Does that unit have a low temperature monitor built in? Maybe that is what is making the noise when your temps dip to -10 degrees. Actually, that is great because the lower the temps the longer you can keep food in the freezer so I would not be overly concerned about that aspect. BTW, have you tried to isolate the source of the humming noise?
Air conditioners will cool 16-20 degrees. So if the house is 80 degrees, 63 degrees is a good output. If the house is 72, the air will be colder. The higher the humidity, the lower the temperature drop will be because the A/C has 2 jobs, to cool and de-humidify. So if the house is humid, the drop will be lower.
Heat pumps are the same as an A/C unit only it works in reverse. Instead of blowing cold air inside and hot air outside it blows hot air inside and cold air outside. The heat being blown inside is extracted form the cold air outside. Its called Latent heat Latin for hidden. Believe it or not even though its 20 degrees outside there is still heat in the air. Example if you want to drop the temperature of a freezer from 20 to 10 degrees you have to remove heat .I know your getting unusal weather and that is the problem. Heat pumps can only work no lower then around 20 degrees outside.Heat pumps are never used above the freeze line. With your unusal temperatures thats basically where you are now. Ride it out. When your temps rise a little your be fine. Im in Chicago.
The snowflake appears when the outside temperature drops to 40 degrees or below, it then changes to red when it is 32 degrees and below. It seems the manufacturer thinks this will assist you with your driving habits on frozen roadways.
On a hot day (80+) check the temperature difference between the indoor coil's inlet and outlet, it should be 20 degrees lower under normal circumstances, if the air temperature is lower than that you may need to clean the indoor coil fins.
Next check the same thing at the outdoor coil; there should be about a 30 degree rise in temperature when the air exits the coil. If the temperature is higher you may need to clean the outdoor (condenser) coil.
the outside temperature sensor on vehicles takes the temperature of the air about 2-3 inches off the ground, that close to the ground it might be a couple degrees colder than the temperature on the thermometer you have mounted in the window of your house.
Where are you measuring the indoor temperature?
To compare it to the thermostat temperature you have to measure both temperatures at thermostat.
The thermostat will only control the temperature at the thermostat, not any where else in the room.
The room temperature depending on insulation in walls and ceiling and distance from outside wall and outside temperature, can be as high as 10° difference from outside wall to inside wall of house.
The lower the outside temperature, the greater the room difference in heating. The higher the outside temperature the greater the room difference in cooling.
sounds like a faulty outside temp sensor. This is located behind the lower front grill on the rad support. This sensor is likely causing your both issues as the voltage drop or resistance is not in the range the ecu expects. You can check http://forums.fourtitude.com/zeromain they will help to clairfy swapping the sesnor if you feel like getting your hands dirty.
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