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Dehumidifier or AC?5/25
For a relatively small-size kiln, what do you think is better, a dehumidifier, or an AC that pulls moisture when it runs too? TIA!
Dehumidifier because it adds heat.
Never heard of using an AC. Would you blow the cold air outside? Definitely use a dehumidifier, but be aware that cheap consumer models can have issues with the acidic moisture coming from wood like oak.
Definitely a dehumidifier, like John said, it adds heat, and an AC doesn't have a purpose for kiln in the slightest, never heard of this, but maybe I'm mistaken. I'd normally recommend commercial-style cause these are considerably more reliable in their build and handle massive excess moisture with no issue, but since you say it's a small kiln, it's pointless to overspend, you could do with smaller. But beware of its ratings and stats, make sure it does well under harsher conditions, so don't cheap out.
I used a cheap DH in my 275 bf capacity kiln for 20 years w/o problems, but I only put air dried wood in the kiln so problems with acidic woods was not a concern. It was a 30 ppd unit which was far larger than needed but what I had. With AD wood you only need a very small DH. That 30 ppd unit could easily handle 1000 bf starting at 14 - 18% MC.
A DH is the same as an A/C from an energy point of view if you put the entire A/C unit in the. Kiln. Both have a compressor, both have a small fan, both have hot coils and cold coils. The A/C, when installed in a home or wherever, extracts moisture from the air and then dumps the heat to the outside, while the DH dumps the heat back into the room after condensing moisture. Both are called heat pumps.
In my experience years ago some dehumidifiers will shut off at higher temps because of higher Freon pressure.