Did an mould inspection yesterday for people with a very strong musty smell in the house, on their clothes etc, interior doors that stick, a black growth they noticed on some of the register covers among other things. This place has had an extended period of high humidity.
During the inspection I discovered the AC air coming out of the register was about 13 degrees celcius, 80-85% RH. They had a Geothermal unit installed a few years ago. Indoor unit is in a dirt crawlspace with a poor vapour barrier. There was no return and ductwork was sealed pretty good so I don’t think it’s drawing in much air from the crawl. Duct work was not insulated and had a little condensation on the outside.
This thing is basically working like a swamp cooler adding cool moist air to the house, but our summers here are very humid… not a good combination.
Would there be condensation on the inside of the ductwork adding to the problem or is the Geo Thermal unit just not woring right? It’s still under warranty so they are going to have it serviced.