Amazons add for this unit said it heats and cools a room. Thats what I needed for some equipment stabalization in a lab. what was sent to me only cools. The manual that was in the box was for a WA-1220M; WA-1220H and WA-1220E. Not the WA-7500M. After reading the the enclosed translated manual for the wrong product I inferred that the M designation stands for "mechanical" control and does not heat but only cools.I don't have time to dig the box out of the dumpster and try to return this thing. total loss.