Since it can only go down to 2200BTU/h, when the heat load is lower than that, it will cycle on/off repeatedly, which is bad for efficiency and maybe equipment durability over the long run. It isn't ideal, however it will work and is certainly much more energy efficient than using electric space heaters.
Do you leave bedroom doors open? This simple change makes a world of difference for us. We do close them sometimes, of course, but we try to not do it for too long when the weather is extreme, and when everyone finally goes to bed for the night, we make sure all doors are open while we sleep.
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