To heat an LG window air conditioner, first ensure the unit is a heat pump model, which can switch between heating and cooling. Set the thermostat to "heat," adjust the temperature higher than room temperature, and verify the power is on. Clean or replace the air filter to maintain airflow. For optimal performance, position the unit securely in the window and seal gaps with weatherstripping. If the unit lacks a heating function, consider using a space heater as a temporary solution.

Reverse-cycle heat pumps in LG window units rely on refrigerant cycles to transfer heat indoors during winter. This method is 2-3 times more energy-efficient than resistive heating, according to the U.S. Department of Energy (DOE). LG models with a Seasonal Energy Efficiency Ratio (SEER) of 16 or higher achieve 16-22% better efficiency than lower-rated units. Cleaning the filter once every 1-2 months can improve airflow by 20-30%, reducing energy consumption by 10-15%, as noted in LG’s 2022 maintenance guide. Weatherstripping gaps wider than 1/4 inch waste 5-10% of heating output, per DOE research. For units without heat pumps, electric strip heaters (1,500-5,000 BTU) cost $0.15-$0.30 per hour to operate, compared to $0.08-$0.20 per hour for heat pumps, based on 2023 average electricity rates. Always prioritize using the built-in heating feature when available to maximize cost savings and longevity.