I can't comment on how much savings it will be over an older dehumidifier though.

-jasper

fwiw..;
I have three portable dehumidifiers, Maytag and Fedders, all 3 were made by the exact same china man. 45pt and 65pt units.

They all match that chart at energystar ... i checked each of them for Liters per kWh with the help of a little kill-a-watt meter.
What I discovered is they all greatly lose efficiency below 60%/80F. Even so the larger ones are much more efficient at L/kWh removed than the smaller one at lower RH settings.

I forget exactly but my units are all rated prox 1.7L/Kwh @60%rh/80F .. and thats exactly correct from my tests.
But lower the setting to 50% and the 65pint units were around 1.4L/Kwh and the 45pt unit is 1L/KWh.
Lower the air temp below 80F and they drop in efficiency below that.

So this means exactly what? I have an old 40 pint/24 hours dehumidifer that draws 7.2 amps. Similar amperage ratings are found on the new "Energy Efficient Models" Ahh, to me electric usage is usage in a 24 hour period. Calculating how much moisture the unit removes in comparison to Kw/h is useless and dependent on the % of humidity, and ambient temperature or some other unknown. If your RH is 85% sure it may remove a liter in a Kw/H, but so might a block of ice with a fan blowing over it. However as you have stated as the RH drops so does the efficiency. The truth is you MIGHT save yourself $30 a year on operating costs because of design changes and higher efficiency coils, compressors, and refrigerate. More typically you can expect to add $15 to $20 month in electric operating costs in a typical setting, relative to your location, climate, and local rates. IMHO some of this energy star stuff is nothing more than a marketing gimmick to increase sales. With the shortened longevity of all of these newer products, you never recoup the cost in the form of energy savings over there life. Instead your repurchasing the product sooner and spending more money than you would have otherwise spent in energy usage. It's good for the corporate bottom line and keeps those offshore imports rolling right in.