When your air conditioner blows hot air while your heating system functions properly, it indicates a disconnect between your thermostat and your outdoor condensing unit. While heating relies on your indoor furnace or heat strips, cooling requires the outdoor compressor and condenser fan to engage. If your heat works fine, your indoor blower fan is operational, but your outdoor unit is receiving no power (due to a tripped breaker or blown fuse), a broken control wire, or a failed outdoor compressor capacitor. Verification: Go outside to check if the outdoor fan and compressor are spinning and humming.
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