Six years ago we replaced both the outside unit and air handler with a major brand's equipment. The copper coil in the air handler had a 5 year warranty and failed a few months after the warranty expired. The replacement coil is aluminum (supposedly more resistant to pinholes), but only would have a 1 year warranty. Needless to say we are not pleased, especially given the cost of replacement.
I'm inclined to replace the air handler altogether, but am disinclined to use the same vendor's equipment.
As a rule, can you mix inside and outside units from different manufacturers? If so, are there specific combinations that are incompatible?
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