Yes, you can replace just your outdoor AC unit and keep your existing indoor furnace, but HVAC professionals strongly advise against it unless your furnace is very new and fully compatible. Mismatching an old indoor evaporator coil with a brand-new outdoor condenser can severely reduce system energy efficiency, cause incorrect refrigerant pressures, lead to premature compressor failure, and void manufacturer warranties. For optimal performance, energy savings, and system longevity, both indoor and outdoor components should be replaced together.
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