heat to rear of unit.
Some wall t-stats will let you run your furnace as well as the fan portion of your a/c. By running the fan on your air conditioner this will recirculate air through out the unit, it will not bring outside in just recirculate air with in unit thus heating entire unit. Make sure to leave all interior doors open if possible this will help as well. So if t-stat has a auto/on switch for fan put it on "on" and at low speed and this should help. Good luck
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