Low humidity? You must mean the several day out of the year it doesn't rain...
Go along the lines of what Gary (Grateful1) said. Radiant heaters heat the obejcts around/below. I used to use a patio heater before I moved indoors with my smoking. You will also then have the option to use it outside on a chilly day as well as long as the wind is not too strong.
Definitely don't go electric space heater. too inefficient
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