Cold outside, but warm inside. The first good test of my new split system and it has warmed the place up beautifully.
I've just been having a look at the power use over the last week since I got them, and I'm using about 1/3 the power. Part of that is that it has not been as cold, but it's looking like I can be warmer than I was and use a lot less power I was over winter/summer. Yesterday I used a lot (including heating, using the full oven & roasting coffee) and the usage is still less than the lowest use day last week.