[yedrow]

I bought an old electric furnace and stuck it in my studio, and it works great. I got a thermostat for 20 bucks at a hardware store to control it.

[Isculpt]

An electric oil-filled heater as Mark suggested is the ticket. I have a pricey electric heat pump for my house, but the little $50 oil-filled heater in my 350 square foot studio (with two huge windows and three half-glass doors) keeps that studio almost as warm as my house. It has 3 heat settings, and I leave it on low when I'm not in the studio. On a 45 degree day followed by a 25 degree night, the studio will be around 60 degrees the next morning. If I leave it on medium, the studio is around 65 degrees. I have a wall-mounted heater/air conditioner that I almost never turn on, and I rarely need to turn the oil-filled heater to high, even though I'm very cold-natured and keep my house at 70-72 degrees. Given that the heaters are very efficient, mobile, inexpensive and have a small footprint, I can't praise these little guys highly enough.
Jayne