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thanks for the science lesson, lol.
the mileage youre losing is minimal. do you realize that new compressors only take about 1 maybe 2 hp tops to turn? thats negligible hp loss.
also, the a/c system runs off of recirculated air - not fresh air, therefore, the temp and the humidity levels that its dealing with are also negligible.
either way, whether you believe me or not, that is the reason why the compressor comes on for defrost.
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