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Size matters when choosing a central air conditioner. The system's size determines how well it will cool your square footage. You will need to work with the dealer or service contractor to choose an air conditioner size to meet the cooling demands of your home.
If you buy a central air conditioner that is too large, it will drive up the purchase cost, cycle on and off too frequently, and decrease efficiency. An undersized air conditioner will not cool adequately, especially on very hot days.
Before your new cooling system is installed, the service contractor will do a thorough analysis of the cooling capacity needs of your home. Make sure that a recognized sizing method is used to calculate your home's "cooling load capacity," and not just a hunch or estimation.