I have one on my Alpenlite. I do like it, but use it rarely. I do live in a cold weather region, but most heat pumps don't run much below about 40 degrees. Basically it uses a heating coil to heat air through the A/C unit, so it makes the same sound as running the A/C, and has a high energy draw like the A/C, so you either have to have hookups or a generator to run it. It heats the RV faster that the furnace. I like it, but my wife hates it because it is also louder than the furnace. If they all have it it's worth it.