A residential central air conditioner has two main parts, the condensing unit installed outside of the home and the evaporator installed inside the ductwork.  For an air conditioner to work up to specs or to work at all, these two components must be properly matched.  Each condenser works properly with only a limited number of evaporator models.  Each of the matches has a unique identifier, the ARI reference number.  Think of the ARI reference number as the marriage certificate for the components of your heat pump.  It is that simple!

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