3.5 Ton Air Handlers

Replacing an air handler with the outdoor unit

When you replace an outdoor unit, the air handler usually needs to change too — especially now that new equipment uses low-GWP R-454B or R-32 rather than the older R-410A. Reusing an old air handler with a new condenser mismatches refrigerant and capacity, dropping efficiency and voiding warranties. Replace them together.

• Replace as a set — new condenser, new matched air handler.
• Refrigerant change — R-454B/R-32 vs older R-410A.
• Efficiency — a matched new pair hits current SEER2.
• Airflow — confirm the blower suits your ducts.

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