Natural gas is less expensive to heat with than electricity. Don't take my word for it, just google gas versus electric heat cost and see what you get. However, the initial installation cost can be much more for gas. In my situation the electric service and gas service shared a trench so it wasn't a big deal to run the pipe. I installed a single 75K BTU gas heater. The electric unit heater CJ linked above claims 17K BTU, it would take 4 or 5 of those to equal the output of the single gas unit. Having said all that I did install an electric radiant heater in the small office area. It was very inexpensive to install, got it from a neighbor for free because some of the paint was peeling and he got a new one for free. But it does run all the time to heat the room and it was definitely reflected in the last billing cycle. The type I used is slow to heat things up so turning it on when you go out is not an option. I think I'll replace it with exactly what CJ used. That way I can flip it on and heat the relatively small space quickly then shut it down.