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Through-the-Wall Cooling Air Conditioner with Electronic Controls, 3 Cool/3 Fan Speeds & 260 CFM Air Circulation, LG's Through-the-Wall models offer versatile, energy efficient... more...solutions for residential and light commercial applications. Some of LG's Through-the-Wall models are ENERGY STAR qualified, an important feature for energy conscious customers. All feature Gold Fin Technology which protects the unit from the corrosive effects of the salt air and extend the operating life. BTU sizes range from 8,000 - 14,000, and both cooling only and heat/cool models are offered. Also, the standard size chassis fits into any competitive wall sleeve, allowing for an easy upgrade for an existing system. How to Choose a Room Air Conditioner Compared to large capacity central units, room air conditioners have several advantages. The initial cost of a room air conditioning unit is significantly lower than the cost of central air. Because room air conditioners are designed for cooling small spaces, operating costs are reduced. And, room air conditioners can provide personalized temperature and humidity controls that central systems cannot. Calculating Cooling Capacity Cooling capacity is the critical factor in properly selecting a room air conditioner. Cooling capacity is measured in British Thermal Units (BTUs) and typical models will range in capacity from 5,000 BTUs to 28,500 BTUs. Choosing an undersized unit will overwork the unit and it will not cool properly. Choosing an over-sized unit will cost more to buy and operate and it will not dehumidify properly. We can help you to calculate capacity. Be prepared to provide specific information on: Room Dimensions A simple floor plan to show the location of doors and north-facing windows The number of people it will serve Sources of heat such as lamps, TV and appliances An explanation of what's above the intended room and Your insulation provisions.