Did you read any of the stuff that I posted above (wind-sun)? Those guys are talking about 9000 BTUh units running at 300 watts.
Of course, at 300w, they aren't making 9000 BTUh.. Maybe 1/4 to 1/3 of the full 9k.
These inverter units only go as fast as they need to.
Right now, my home is being heated by a 24,000 BTUh Sanyo (rated at 36,000 BTUh in heating mode).
It's switching off and on, using about 15w in standby and about 480 watts when pumping heat. (making around 4k to 6k BTUh).
http://i46.photobucket.com/albums/f1...r/NCL/F160.jpg
It's 53F (w/ light rain) outdoors right now and 72F in here.
If it were down around 20F, then it would use around 600w when heating.
If these are really the kind of temperatures you get up there, (Typically above freezing)?
http://travel.usnews.com/images/dest...rature_f_2.jpg
http://travel.usnews.com/images/dest...ature_c_60.jpg
Then you should use a mini-split ASHP (Inverter type).
Mine are old models and they work down to about 8F..
At 5F, I start thinking about backup heat.