I know its a pain but I will usually top off my bt65 after about 12 shots. not as nice as my guppy tank but it only takes about 60 pumps but it still stinks. like today its 94 and feels like 200% HUMIDITY. I took it out yest to go after a chuck no good scope instantly fogged and crazy condensation on gun. later my wife said just open and shoot out the window next time. I would have but I figured she would give the LOOK.