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Turn it down. If your unit has a thermostat, set it to 78 degrees F.
Fan only. At night, use your air conditioner's fan-only mode.
Use the recirculate option instead of constantly cooling hot air from outdoors.
Turn the air conditioner off when you're out.
Clean the filter often, (biweekly or as needed), and where possible, hose down the back of the unit to remove debris that can clog cooling coils.
Seal leaks. Make sure window models are installed as tightly as possible to prevent hot air from seeping in around the unit's edges.
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