How old is that electric heater? We keep a space heater a) in my room, which tends to be cold when closed off, as at night, and b) in the garage, since the cat likes to hang out in there at night and when the weather's bad. We replaced the one in my room last year, and the garage heater back in the fall when the nights first got chilly, and with newer appliances, we're not seeing such a huge spike in the electric bill -- stuff really is made to be more efficient these days! And these aren't expensive heaters at all, just Walmart $15 jobs.
Andria
They are actually two 1500 watt heaters with fans, probably very similar to the Walmart jobs you have, which I've modified to be more reliable in the nasty, for them, workshop I have in the garage. I keep them working properly by doing regular maintenance on them. I could have put a good natural gas heater in there, but I don't use the space often enough to make it worth the cost of doing that.
The biggest issue for me is the cost of electricity, for sure. Ontario is pretty lousy in that regard. OTOH, I could heat the space a lot more efficiently with natural gas, but I don't use the space enough to make it worth my while to make the investment to do that.