Its not the most economical thing, but as soon as you can afford, I highly suggest a Venmar air exchanger. Dehumidifies, brings in fresh air, expells stale old air, and exchanges it so you aren't losing hot air out the side of your house and having to reheat cold air coming in. They are about $750 plus install, but again, worth every dime. Our place stays at a constant 40% humidity and I evap about 2" of water out of my 100g sump a day. (although that might be some overskimming too)
