Not very well, I lived in an apartment with one of those in the hallway, had to set up a fan to blow warm air to the living room or bedrooms or it got way too c

Not very well, I lived in an apartment with one of those in the hallway, had to set up a fan to blow warm air to the living room or bedrooms or it got way too cold on cold nights. (which fortunately, were rare where I lived). It'd definitely be better than nothing in an extended power failure, but forced air heat is more comfortable