Purchased a new LG model LWHD7000HRY7 window unit air conditioner/heater in one unit.installed by contractor in new construction. This 7000 btu unit will not heat a 200 sq ft room that is windowless (the unit is installed in a special custom wall cut through sized to the unit). Room is insulated heavily with closed cell spray foam insulation (best you can do) and only has one new insulated door. Warranty service technician says that while you can't feel much heat at all at the discharge of the unit that this is the best they can do. Unit does not heat to 68 degrees room temp and never cycles off as a result. The heater portion of unit is worthless.
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