Maintaining an air conditioner with the help of periodic air conditioning service is as important as choosing the air conditioner while purchasing it. There is often utter confusion regarding the size of the air conditioning unit to be bought as it involves complex calculations.

The simple way to test an air conditioning system to determine if it is functional is to wait for a 24 hour period when the exterior temperature is above 65 F degrees. Testing air conditioning units when it is much cooler out can either burn out the compressor as it tries to compress liquid refrigerant or yield a false result. If it cools out you can either require the owner to place money in escrow in case the unit does not work when you try it in the summer or you can hire an air conditioning hire company to come out and test the equipment. They can connect pressure gauges to the equipment to determine if it is operational or not.