Hello all, I've been lurking around here since last October. First off: I've had a Quad 1200 since Nov. heating my 2500 sqr foot house. I'm in line to save approx $1000 in propane costs this year. If propane stays at or above current rates and pellets stay at current rates, the unit should pay for itself in about 3 more seasons. I fully vacuum the unit, wash the heat exchanger plates, clean the tubes weekly, and have checked the vent on occasion to assure proper function. As winter SLOWLY relinquishes its grip on the northeast, my thoughts are to shut down procedures. I'm thinking I want to get all possible combustion byproduct out of the unit. Does it make sense to "damp" clean it (damp towel), or just use a dry cloth to wipe down all interior components? I'm worried that summer humidity will cause some oder in the house. Also, should I "treat" the heat exchanger plates with a light oil or re-paint them to prevent and surface rust? The unit is direct vented, should I cover the vent cap to prevent "critter" from nesting in the vent?