Forced air heat is by far the best to have in a rainy locale like the Pacific Northwest, as it helps prevent mold and moisture problems.

Your letters most likely will not penetrate the owners, especially having them clicking on a we buy house website.  

I think $400-500 installed would cover it.Windows with moisture between the panes could be about $150 each.Hope that helps a little.

I just called a mold removal company and they said they could penetrate walls to treat mold.

Generally a moisture barrier is laid on top of the slab and the laminate boards interlock together on top of the barrier.

It's just a matter of how much.Dehumidifier will definitely help out and suck alot of the moisture out of the air.chris

I've seen leaky pipes, moisture coming through the foundation walls, moisture coming up through the foundation floor, and improperly vented rooms.

I have read mixed reviews from northerners about teh plank not sticking to the concrete in the basement due to moisture in the slab.

Given an average of a few inches of rain hitting the ground even in a pretty big rainstorm, it is unlikely that the moisture in the basement is from the rain water that hit within the couple of feet next to your foundation.

If not, perhaps steam/moisture from the shower is causing a short-Check all the other connections on the circuit while you're at it-Is there a leak behind the wall coming from the bathroom and getting to the GFCI wiring?