Well, heavens. You never know if these things are going to make a difference when it's -30 outside and the wind's howling, but this little heater does the trick.
We put it in our back entryway, you know, the one that's always drafty no matter what you do. It's not a big space, but it was always freezing cold. Now, it's just... comfortable. It's quiet, too! I don't even notice it's on, apart from the fact that I'm not cursing every time I come in the door.
My husband (he's handy, thank goodness) said it was no bother to install.
It just takes the chill off the air, plain and simple. Does its job, no fuss. A real good buy for us.