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Air conditioners only appear to put cold air in to a structure when, in truth, they remove the heat from the air that is pulled in to them that is already in the home before this same air is placed back in to the structure with its heat removed. What happens to the heat that is removed? It is carried by the refrigerant to the outdoor coil where it is supposed to be released to the outdoor air. The problem with your air conditioner sounds like the outdoor coil is so stopped up with dirt and other items that the heat in the refrigerant can not be removed to the outdoor air. This causes the internal refrigerant pressures to build up so high that protective devices shut the unit down to prevent it from doing any harm. The night time air temperatures outside are low enough that these refrigerant pressures do not reach this "cut out" point, which allow the air conditioner to operate normally at night. What is the cure? Clean the outdoor coil with a water hose (not a pressure washer). This will remove most of the dirt and debris that is compromising the removal of heat from the refrigerant.

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Q: Why will your window ac have cold air at night and kick on and off in the day?
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