Good point DBoon, Like yourself, I assumed smaller units would be more efficient. I thought I could get away with a 40 pint unit and initially searched for units in this class to conserve a little energy. After doing some reading, as you mentioned, the larger units generally remove more moisture with a given amount of power. With that knowledge in hand, I ended up going with the Soleus Air DP1-70, which is the 70 pint unit in my initial post. The energy star site (I think it was that site anyway) had a listing of models and their efficiency, it does suggest bigger generally equals more efficient. The larger units do consume more power while operating, but they more than makes up for it by removing even more moisture while doing so. So far I'm very happy with the DH I purchased. It does make a little noise (fan noise mostly), but it can't be heard upstairs and it's not really bothersome downstairs. I'm glad I bought the larger unit. Given the amount of time my 70 pint unit is working, I don't think the 40 pint unit I initial was interested in would have done the job. Feeding the DH directing in the Little Giant condensate pump has been working excellent as well... it beats the hell out of emptying the DH every day like I was doing last year.