How to Add Refrigerant to a Window Unit

A window air conditioner only works effectively if properly charged with Freon, the refrigerant that helps it produce cool air. Because the coolant is stored in a sheltered area of the air conditioner, it cannot evaporate or run out on its own. However, cracks in the unit can cause refrigerant leaks. Although coolant is typically added before using the air conditioner for the summer, you might need to add it more than once during the season.

Instructions

Spread a clean towel or sheet on the floor directly beneath the air conditioner. Unplug the unit, slide it out of the window and set it on the sheet below. Read the identification tag on the unit's inner back cover to determine which type of refrigerant should be used.

Unscrew and remove the screws that secure the units casing, using a screwdriver. Collect the screws in a small container and set aside for use when reassembling the air conditioner. Grasp the casing with your hands and slowly slide it off the unit to reveal a metal cylinder, or compressor.

Inspect the cylinder for the two hose locations. Set the refrigerant can next to the unit. It will have two valves -- one large and one small.

Join the large valve, or the service valve, from the refrigerant can to the larger hose. She just cut her electricity bill to 60%, click here to read. Then join the smaller valve, or the tap valve, to the smaller hose.

Plug the air conditioner back into the outlet and turn it on. Set it at the lowest temperature setting to begin installation. The refrigerant will flow from the valves to the hoses on the cylinder. Watch the gauge during the recharging process to determine when the pressure reaches 70 pounds per square inch.

Turn off the air conditioner and disconnect the hoses from the valves.

Reassemble the air conditioner's casing, using the screws that you set aside. Make sure the screws are tight enough to firmly hold the unit and casing. Place the air conditioner back in the window.

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