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Hate to be negative - but my understanding of why the AC unit does some cycling during the defrost mode is more to help the compressor from locking up and keeping it in good working order so that when you do need it in the summer - it works - I guess - years ago - drivers would go to turn on the AC on the first hot day of the summer - to find it only blowing hot air - and engineers found out that leaving the compressor off or not engaged for 6-7 months - late fall- winter- spring - caused the unit to sieze up - so that is why AC units do some cycling durnig the defrost cycle - to keep them in good working order - my understanding anyway.
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