When outdoor summer temperatures climb to 90 degrees Fahrenheit, your air conditioner is generally designed to maintain an indoor temperature about 15 to 20 degrees cooler than the outside air, making an indoor target of 72 to 75 degrees Fahrenheit comfortable and realistic for standard systems. Attempting to force an AC to reach extreme lows like 65 degrees when it is 90 outside will cause the system to run continuously without shutting off, risking frozen coils and compressor burnout. Verification: Measure the temperature difference between outdoor air and indoor supply vents to ensure proper cooling.
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