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PTAC systems may be adapted to provide heating in cold weather, either directly by using an electric strip, gas, or other heater, or by reversing the refrigerant flow to heat the interior and draw heat from the exterior air, converting the air conditioner into a heat pump While room air conditioning provides maximum flexibility, when used to cool many rooms at a time it is generally more expensive than central air conditioning. With our extensive range of air conditioning units, including room air conditioners, single and multi-split systems, Multi VTM systems for high-rise buildings, and heat recovery ventilation systems that filter air and create healthier space for your clients and colleagues, LG air conditioners give you the ability to create a comfortable environment year in and year out.