I have a octagon shaped window in my bathroom that condensation builds up on the inside when the outside temperature gets below 35 degrees. When the outside temps get below 30 degrees, the inside of the window actually gets about 2 inches of ice all around the outer edge. The inside wood trim is stained from water and getting black. Pella says it is too much humidity in the house. I recently returned from a10 day trip where the furnace was not on and the temps got into the 30's overnights a few nights to find condensation on the inside... read full review »