Frequently Asked Questions about AC Systems

(Q) Why is my air conditioning unit humming, but the fan and the compressor are not running?

(A) The breaker has tripped or the contactor is bad. Call AC Repair for help.

(Q) The fan motor inside the AC unit is spinning but there is no cooling. What’s happening?

(A) The air conditioning compressor is not starting. Turn the unit off and contact AC Repair for help.

(Q) Why is the AC system not cooling, although both the compressor and the fan motor are turning?

(A) Possible causes include a dirty filter, a bad indoor fan motor, leaking freon, a frozen evaporator, or a compressor not pumping adequately. Turn the unit off and contact AC Repair for help.

(Q) Why is the outside air conditioning unit humming, but the fan motor is not turning?

(A) The fan motor is bad or not starting. Turn the unit off and have AC Repair check the unit.

(Q) Why is the outside air conditioning unit is running, even though the thermostat is set to off?

(A) The contactor is bad. Turn the breaker off and contact AC Repair for help.

(Q) Why is there is a shrieking sound in the furnace and the pipe outside is frozen?

(A) The blower wheel might be broken. Turn the unit off and contact AC Repair for help.

(Q) How often do I need to replace my AC filter?

(A) It is time to replace it as soon as a layer of dust can be seen on the filter.

(Q) Aren’t the pleated AC filters suppose to last 3 months?

(A) Not really. If it looks dirty, it’s time to replace it.

(Q) Why do I have to add Freon in my air conditioning unit every year? Does Freon get used up?

(A) No, Freon does not get used up. Your air conditioning system has a leak that needs to be repaired. Contact AC Repair to locate and repair the leak and you won’t have to add Freon every year.

(Q) Why is water dripping from the overhang of my house? Does my AC unit have anything to do with this?

(A) Yes, the evaporator’s drain pan of the air conditioning system is either clogged or corroded. Please contact AC Repair as soon as possible.

(Q) Why do I have water dripping through my ceiling? Could the air conditioning system have anything to do with that?

(A)Yes, if the dripping increases when the AC system is running. Otherwise, it may be the water heater if it is in the attic, or a leaky pipe.