Where do you think the moisture goes? It goes into the air. Venting your dryer into the house is downright dangerous if it is a gas dryer. If it is electric, it will make the air very damp and can cause mold to grow on the walls.
Usually if the clothes are taking longer to dry it usually is lint clogging the exhaust piping somewhere. Also, you should never vent the dyer into the house or attic. You are pumping warm humid air into the house.
Clean the vents first; if you want your clothes to dry faster simply put in a large thick dry cotton towel with them; it absorbs the water faster! (And cuts down on utility bills!)
My dryer started taking longer to dry clothes, but it was still getting hot (I could reach in and I'd have damp, hot clothes). I had my husband get a brush-thing to use on the dryer, then he got a brush/auger to use on the vent that goes out the house. Here is a link to what we got, but I think he got ours from Home Depot or Lowe's.
http://www.amazon.com/Gardus-RLE202 ... e=UTF8&qid=1285622478&sr=8-1
My machine was fine. But I had a massive, damp clog of lint in my vent. He said it was so damp, he couldn't imagine it ever catching on fire, but I know that clogged vents can be big fire hazards. After he removed the lint clog, the dryer performance went back to normal.
I don't know how you'd heat your house with the clothes dryer. Maybe instead of venting it out, you just have it blowing into the house? But you'd get lint everywhere, and that can't be good. I don't know how it would adversely affect your machine. If the machine still seems to heat up, maybe head to the hardware store and pick up one of the brushes to clean out your dryer. Other than that, I don't know.
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