Inside the supply plenum: mold at the coil, and streaking all the way up the stack. That happens when outside air is constantly being drawn in from from a leaky envelope and an oversized unit that short-cycles. Fix = seal the envelope/returns, right size equipment, control humidity, and clean/replace contaminated parts (including the ductwork) before you pressurize the problem again. Plan your mechanicals first so you aren’t paying to rebuild them later. Looking for someone to come check your ho
Inside the supply plenum: mold at the coil, and streaking all the way …
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