It's a small 3BR 1956 ranch, with an add-on den (that's hard to heat)
and we are heating almost the whole house. (abt 1200 sq ft)
The smallest bedroom is un-used about 70% of the time.
Which means we keep the door closed a lot. It does get chilly in there.
The attic insulation isn't what most would call great, but it's way better
than most on this street. The wall insulation is poor, but we did leave
the old wooden shingles on (w/ a 1/2" fiber padding underneath),
when we added the vinyl siding (w/ 1/2" foam insulation underneath).
The windows are double pane replacement type, medium quality
and the doors leak cold air.. They need work..
My guess is, the insulation would be pretty good, if this house was in VA or NC..
IMHO, These two Sanyos are very efficient, and work well in a house this size..
The published heating spec says during a day like today, one of these
24k BTUh units could put out 36k BTUh. That's 72k BTUh (of heat) total.
But, these things rarely run more than a few minutes at high power.
They just peak (3kw /w both at max) when the setpoint is increased,
then they mellow out running about 900w (450w each).