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A: In case your unit is 7 years previous or older, requires frequent repairs or stops working, fails to warmth or cool areas of your property, runs excessively or always turns on and off, or produces high utility bills, it might be more economical to replace your existing system than attempt to restore it. Open your windows at evening if the air exterior is cooler than inside, and shut them - along with blinds and shades - before the sun hits your home within the morning.