Just a quick data point for this thread... We recently moved into our new off grid home in Maine (often somewhat humid), and purchased the LG Washtower - a full size (7.4 cu ft dryer), stacked, ventless heat pump dryer over a front load washer, with the controls for each combined in the middle of the stack. Uses a typical 240V, 30 amp feed for the dryer and a separate 120V, 15 amp feed for the washer.
We really like it. Dryer uses about 400-500 watts and takes about one hour to dry most normal loads (our old dryer in the previous house usually took about 35 minutes but used 4000-5000 watts while running).
There are settings for things like bedding that look like they'll run for three hours or more but we haven't had to use them (maybe when we wash and dry a big comforter?). For regular blankets and sheets, towels, and normal clothes, the "normal" setting works fine. We did bump up the dryness level to one setting above normal so that clothes feel dry, but once we did that there's no damp feeling at all. The clothes are warm but not hot when we remove them, but somehow feel softer than with our old dryer in the previous house.
Re: energy use, we have about 250 watts of continuous background loads in the house. Over the weekend we did a lot of laundry while it was sunny and I watched the energy use closely over four loads. With both the washer and dryer AND the 50 gallon heat pump water heater running, we were using only between 1400-1600 watts for the entire house, including those background loads. Hope that info helps someone.