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On a sunny day, check to make sure that the sun does not shine on the wall thermostat or anywhere near it. Check it several times throughout the day and each month because the vertical position of the sun changes throughout the year. If the sun does shine on the thermostat or near it, it can trick your thermostat into sensing that your house is warmer than it really is. This makes the central air-conditioner run more and pushes up your electric bills.
There are several ways to block the sun. One method is to just close a shade or curtains. This will also help reduce heat buildup in your house. Place a tall floor plant near it to shade it. In one home, Install some removable, reusable static cling window film on that window. It will also reduce fading of the curtains and carpeting.