went over to visit my daughter last night and as soon as i walked in the door at their house the high humidity hit me. their a/c unit is a hp, about 5 years old, right now i don't have any details as far as sizing, etc. because my first concern was the crawl space under their house.
we live in central oklahoma, crawl spaces are very, very rare here. nearly all houses are on slab. their house is older, probably 40 - 45 years i would guess and small, maybe 1000 -1100 sq ft.
anyway, back to the crawl space. i told her i'd take a look under there....it is uncovered earth, there are about 6 vents around the perimeter.
i found first, one of the 5" supply ducts from the hp hanging loose and completely open, cooling the unsealed crawl space quite nicely. it should have been connected to a supply register for their utility room but there was never a transition piece made and the round insulated duct was just left open under the house. wrapped the end and sealed with duct tape for now...
next stop, the dryer vent. the dryer is venting out into the crawl space. there was a dryer vent cover on the side of their house...about 20 feet away from where the dryer is dumping copious amounts of lint under the house.
i'm dealing with that tomorrow.
i'm going to have them call the company that replaced the hp when they bought the house and just do a complete checkup, make sure all pressures, airflow and temps are correct to have that end covered.
i'll run a 4" round duct for the dryer vent and get it out of the crawl space.
what i'm not sure of is the crawl space vents. open or closed? the earth inside was damp only at the entrance where the cover was in poor condition and over by the dryer vent. there was no pooling or standing water, just dark and slightly moist feeling. because of the cost of sealing the space, it would not be an option for them. so, as it sets, uncovered earth, the open supply duct sealed for now and to be reconnected later, and the dryer dump resolved, should those vent dampers be open or closed? what determines whether they should be opened or closed? i've never lived in a house with a crawl space so i don't know.