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How high are the ceilings? If they 9' or better and you are working mainly in a single area, I'd recommend something like this, http://www.morelectricheating.com/de...FYl9OgodEHYASA
It will heat you and the stuff you are working on versus heating the air (which rises) which in turn heats you. We recommend IR heaters all the time as energy measures. And the one I linked is electric, you CAN get gas, but the installation is more. Installing them overhead makes them more convenient to work around.