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Hi, I recently had a new rheem 14 Seer 2.5 ton ac unit installed in my home. After a few days, i started smell a chemical like odor indoors and system wasnt cooling properly. The AC guy checked it and found that a valve to indoor unit wasnt tight causing freon to seep out. More freon was aadded. Howver, the smell still comes and go. The ac is warm during day and cools at night and in the mornings. What could it be?