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Originally Posted by wendybeth
We have very big house that cools downstairs wonderfully but rarely achieves the target temp upstairs, in winter or summer. .
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We had the same issue, until one day I happened to notice a warm breeze coming from the kids bathroom. It turned out the exaust fan was installed directly to the outside with no protective flap so hot air was just flooding into the top floor. Once I fixed that it was MUCH better. You might want to go around with the candle test and see if you have any air leaks. Don't forget to look at outlets for leaks also.