- Placed in direct sunlight: If the thermostat sits in a location where direct sunlight falls on it for long stretches during the day, the radiant heat from the sun will cause the sensor in the thermostat to register a temperature much higher than room temperature. This ghost reading will trigger the AC to come on when it shouldn’t and run for too long. The wear and tear will make it require early repairs.
- Placed close to outside drafts: When a thermostat is near to windows and doors that allow in outside air, it will also begin to pick up ghost readings, although in this case they will be lower than room temperature. This time, the AC will start “short-cycling,” turning on briefly, and then shutting off again. This strain will rapidly age the system.
- Far from the center of the house: A thermostat placed in the distant reaches of a home will not pick up representative temperatures. These outlier readings will cause the thermostat to control the AC so it provides uneven comfort. The air conditioner’s behavior will become erratic, leading to stress on its components.
Source: http://www.airconditioningexperts.net/blog/how-poor-thermostat-placement-leads-to-air-conditioning-repair/
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