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Re: air handler in crawlspace
Least you forget, air handlers, unlike ducts, are opened for servicing.
Wrapping a duct in insulation which is never intended to be disturbed is one thing, wrapping an air handler in insulation which is going to be repeatedly cut open and never sealed back up tight is a totally different animal.
IF the insulation inside the air handler is adequate (as designed) then you should not have all that condensation on the outside.
However, once an air handler overflows inside the unit, the insulation gets wet and become like all wet insulation - useless.
Likewise, once the insulation has been cut and taped and cut and tape and cut and taped, you know it will be leaking air around those cuts and tape.
Heck, ever seen one re-taped after the first cut? Not often.
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