Proper care of your air conditioner can keep it working efficiently and save you money over time. We recommend having a helper for installation. Some other tips:

Check the electricity. Before you install an air conditioner, be sure the electrical circuit to the room can handle the electrical load of the unit. Read the owner's manual; larger models typically need a dedicated circuit. Never use an extension cord with an air conditioner.

Secure the unit. Always use the manufacturer's safety hardware, such as sash locks and mounting brackets. Unless the manufacturer's directions say otherwise, the U.S. Department of Energy recommends that an air conditioner be level when in­stalled so that the drainage system works efficiently. Seal around the perimeter of the unit with new weatherstripping, if necessary. If possible, place the air conditioner in a shady spot to keep it away from the sun's heat.

Vacuum the debris. Unless your unit is brand new, vacuum dust and debris from inside it before installation. For most models, you’ll have to remove the screws on the outer panel to do this. Models with a slide-out chassis make it easier, since you must remove the exterior panel before installation. Vacuum the indoor and outdoor fins with an upholstery brush attachment before each cooling season.

Clean the filter. Vacuum and wash the filter in warm, soapy water, rinse well, then reinstall when dry. Clean the filter monthly or as needed. Replace deteriorated filters.