Air conditioners are practically a requirement in todayâ¤™s humid weather. If you are considering purchasing an AC system, you have to choose wisely to avoid inflating your electric bill to unmanageable levels. These considerations suggested by ASHRAE will help you find the right unit, which can then be installed by a reputable Rancho Cucamonga air conditioning contractor.The standard first step in installing an air conditioner is to take measurements of the room to be cooled. Knowing the dimensions of the room can help calculate the load, which is the capacity of the AC unit needed to keep the occupants cool. Measure the area of your home accurately so that the appropriate load can be calculated; HVAC companies can help you with this once you are done measuring.