We have 3 separate sections of our downstairs, 2/3 of it is a MIL apt that is being rented so her door is always closed. 1/3 is a foyer, laundry room, and bathroom- this is outside the MIL. And finally through the foyer yet another door is an office and hallway that lead upstairs. Can I put one dehumidifier in the middle of this crazy downstairs which would be the closed foyer (but there are doors leading to the office/upstairs and the MIL) or would it better to have 3 dehumidifiers- one for each separate section? I know this sounds like a crazy question and I'd just get 3 if they weren't so expensive! Just wondering basically if they work through doors..