After living in our new Philadelphia suburb home for a two months, I see that I'm going to need a dehumidification in the basement, downstairs bedroom, and the upstairs laundry area for the spring and fall. These areas have the most mildew / mold spots on the paint. My first thought was to get a whole house dehumidifier and connect it to the downstairs HVAC system. I cannot do this because the main supply in not accessible because it is in the slab and the AC coils are right on top of the slab. I've also read that the dehumidifier hookup needs to be about a foot or more from the AC coils. The home is 2900 sq ft, has an furnace and AC unit for each floor place in the basement which is on the 1st floor. The 1st floor shares space with the basement.
So my other thought was to have the dehumidifier such as the Santa Fe Classic placed in the basement with the return drawing air from the downstairs bedroom or from the upstairs hallway and have the supply send the air to the downstairs bedroom, the basement, and to the 2nd floor laundry room. The longest run would be about 25 feet. My think the return that far away we would have some negative pressure going on, but I don't think that would be an issue.
The Santa Fe Classic has a 275 CFM blower, and does 3 L/kWh sized for 2500 sq ft at 110 pint / day and a MERV 11 filter. I might change it for a cheaper Aprilaire 1770, but it ins't as efficient.
What are your thoughts? This unit would run primarily in the spring and fall with the AC units doing the work in the summer. I attached the drawing on the unit placement with the ducts and a picture of the home.
Thank you - Jeff