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- Cools, circulates, filters and dehumidifies the air.
- Ranges in size from small units with a cooling capacity of 5,000 BTUs (enough to cool a small room) to capacities as high as 12,500 BTUs.
- It is important that you choose the right size of air conditioner. An oversize unit will cool but leave a damp and clammy feeling because of high relative humidity. An undersized unit will not operate effectively on very hot days.
- Select by BTU rating, not horsepower. BTU is the actual cooling capacity of the unit.
- Determine the efficiency of the unit by dividing the watt rating into the BTU output. The unit must have an energy efficiency rating (EER) of at least 9.7 for models under 8,000 BTU/hr and 9.8 for larger models. The most efficient models have an EER of 11 and higher. Each model should have its EER clearly marked.
- Most models should include window-mounting kits. Kits include sill brackets for extra support of the unit and side vents to ensure an airtight fit in the window.
- Make sure the unit is designed for the type of window you have. Most are designed for double-hung windows, but some are made or casement windows or for in-wall installation.
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