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1. Turn off the 240-volt power at the appliance shutoff box. It’s usually outside within sight of the outdoor unit. Some shutoffs simply pull out; others have a handle to pull down or a fuse to remove. If there isn’t one, turn off the power at the circuit breaker at the main panel that controls the outdoor unit.
Tip
Schedule the pros early—don’t wait for the first heat wave, when they’re superbusy repairing breakdowns and installing new units!