We built our home two years ago. Had trouble with the air conditioner, but a new company created zones and now the temps in each room are all withing 3 degrees of each other. However, we are fighting humidity in two of the rooms. Our den has one window and one french door which leads out to our deck. Attic is above it, bathroom, family room/fireplace next to it, guest bedroom below it. Our bedroom has double french doors that lead out to our front porch. The bedroom is over basement storage space with a dehumidifier which runs continuously. Has bathroom, hallway and foyer on the other sides. No leaks have been found. If we turn off the dehumidifier so it doesn't keep me awake, it is humid and smells musty the next morning. Same thing in the den. That dehumidifier must be running all of the time or it smells musty and feel icky. Any suggestions?
Two Humid rooms
humidity
Best Answer
to me it sounds like your moisture problem is from the basement. You may not see leaks but to moisture concrete can be permeable. To find out if this is the source of moisture tape a trash bag to the floor for 24 hours. When you pull the bag the next day if you have moisture on the bag or this area of the slab looks wet you have found the source of the moisture. I have had this same issue and found an epoxy floor coating drastically reduced the moisture. We still used a dehumidifier but it was only collecting a small amount of moisture compared to untreated slab. If you go this route you may have to wait until late summer so the ground water is less and the epoxy will bond. Or find one that will seal with moisture in the slab. I have done this on a full basement and a daylight basement and had great results on my own homes.