Coming from boating world,,, for us running a de-humidifier was far more important than heating. If one does not control condensation in humid environment,,, you'll have water dripping from vents and AC coils. Combine one with a small spaceheater (size depending on severity of your winter, ie latitude altitude). On my farm we use small portable ceramic heaters that kick-in at 40 F to keep things from freezing.
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