We were trying to find an inexpensive option and went with the Lasko Oscillating Ceramic Tower- it works well. Definitely better for small spaces, but we sometimes put it on the 3 car garage and you can definitely feel the warmth it puts out
I used a Eheat Envi 120v Plug-in Electric Panel Wall Heater - 3rd Generation (LE5012P) for a Sun Room that did not have previous heat. I liked that it was more of a consistent heat than some other space heaters.