78
The Auto button will turn on the AC then set your desired temperature.
the ac in the car cools, the fact you have set a higher temperature than the ambient tempereature means that the car's heater is working and so is the ac, if you wish to heat up your car, turn the ac off.
Simple, you ac does not blow cold air even though you have it turned on and the temperature set to cold.
The ac will turn on when the HVAC is in defrost mode, no matter what the temp is set at.
One way to tell if you're low on coolant on a central AC unit is to feel the air coming out of the vents. If the air is warm or room temperature, it is a sign that you are low on coolant.
Check the superheat in the system.
Some a/c compressors cycle on and off to maintain a set temperature.
as close to the air temperature outside. then no cooling or heating of air has to take place
Trane brand
Anywhere from 15-20 degrees F below ambient (return) temperature. Take a temperature reading at a cold air register and at the air return. Registers farther away from the blower will be slightly warmer than those closer. So, if it's 85 degrees in your house when you get home, and you fire up the AC, don't expect air any colder than about 70 right away. As the AC pulls the air temp in the house down, the air from the registers should become cooler. Also, don't expect a central AC unit to cool a house much below 20 degrees cooler than the outside temperature. If it's 100 degrees outside, 80 degrees inside is about the best you can expect from a central AC.
Central air conditioning systems use lots of electricity, comprising 30% of a monthly electric bill. Portable AC units can be a great way to save money, and help the environment. A central AC unit provides a uniform temperature throughout the home. Since most homeowners spend the majority of their time in one or two rooms, cooling all rooms in a home can be inefficient. During the summer, set the thermostat on a central AC unit to 78 degrees F. Use a portable AC unit to cool other rooms to the desired temperature. This will help reduce a high power bill, while helping the environment.
Low refrigerant charge? Temperature contro set to HOT position?