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I have a 1600 sq ft home. The wellmate sprung a leak last Sat and soaked the basement. Im running fans down there and just got a 40 pint dehumidifier per the service guy. What setting should I set it. I have central air. I don't want basement to mold. I had it at 50 just put it on 45.

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Humidity levels between 40-50% are what most people prefer in a house. So, I'd say that setting is fine. If you live in a humid region, you may want to keep the dehumidifier running down there all the time (and set it up to drain via a hose rather than having to constantly empty the bucket)

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Just keep in mind, if you drain a dehumidifier via a drain line it could potentially run continuously. You'd be surprised how much electricity a dehumidifier can suck up. – Tester101 Jun 29 '12 at 11:54
True, though I come from the land of humidity where it's normal to have a dehumidifier running continuously in basements. – DA01 Jun 29 '12 at 14:35

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