I am in the process of doing my 1000sq ft garage now with epoxy kit from Garage Flooring LLC cost is approximately 1.10 sq ft with acid etching. I spent 8 hours etching the floor. I will prime Saturday color coat Sunday and top coat Monday.
I live in western WA state and heat a 24x24 pole building w/9ft walls, no insulation but it is sheet rocked, with a Cadet hot one heater. It is 220 volt and has a bracket to mount to wall. It does have a built in thermostat but I do not use the garage every day so I just go out and turn it on...
I have used TheToolWarehouse.net several times. While they always say the tools are on "sale" their prices are competitive and over $99 is free shipping. They have a large selection and shipping is fast.