Ideally, your central air-conditioning compressor should be located on a shady side of your house because it has to work a little harder in full sun. Studies show that shading a compressor can shave 1 percent to 2 percent off cooling costs. However, air flow is much more important because it’s the air moving over the compressor’s coils that causes them to give up their heat, and that’s what makes the system work. It’s important to keep fences, shrubs, and anything else that might block airflow at least 24 inches away.
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