Given how damp and musty the whole house is, I bought a dehumidifier. After reading a bunch of reviews, I picked the SoleusAir Energy Star 45 Pint Dehumidifier, #DP1-45-03 I'm trying to buy efficient appliances and fixtures for the house when ever I can - although I'm sure that at some point I'll come up against a place where I can't get the function I want at a price I can afford. It actually had pretty-mixed reviews, but that seems to be par for the course for dehumidifiers at this point. Which is rather disappointing, because I'm pretty sure the dehumidifier I bought 20 years ago is still drying out my neighbor's basement. It did lose a wheel from our rolling it back and forth across the street depending on whose basement was flooded (until I got the problem taken care of - her basement was hopeless, it had literally been built with a small creek running through it so people would have somewhere to keep their milk cool.)
Anyway, after a couple weeks of dehumidifying, my house smells significantly less musty and is staying drier. Living there actually seems like a reasonable idea (which is a good thing, since I need to move out of my apartment in a week.) I still need to get a hose so it won't stop when the pan fills (and the drain pan is really small), but it's been such an improvement just running to full once a day. Of course, once the house isn't sitting on the ground and I get the sump pump fixed, things will be even better!
(Disclaimer: If you actually follow the links and buy something, I get affiliate commission from Amazon - I'm not holding my breath.)