Couple of reasons. First make sure the filters are not blocking the air flow. (Yes when they are too dirty they can actually do that.) Next may be that the blower is out. That you may want to contact...
Your air compressor is dead or the refrigerant has leaked out. Wait!!! Don't give up yet. This very same situation happened to me. I had air blowing(not cold at all) but the outside A/C compressor...
Your air handler is working but the compressor outside isn't. The air handler is responsible for pumping the cooled air through the vents and into your house. It may be located in the attic,...
Here is a short list of the most common causes: air filter is plugged low on refrigerant breaker is tripped batteries in thermostat need to be replaced furnace or air handler blower door is off or...