Commercial and industrial RAC consumers often waste money by not paying attention to efficiency ratings. More efficient units are often more expensive than less efficient units, but not always. Smart consumers can save money in the long run by accounting for both first cost and operating cost, and then selecting the unit with the lowest lifecycle cost. Most room air conditioners in North America are installed in windows . Basic window models are used in ordinary, double-hung windows up to 40 inches wide and can be installed by the user.
Installation usually requires removal of a window panel.
The exhaust hose vents out a window equipped with the manufacturer's sash kit. Select the right size. An undersized unit won't be able to cool a large room, while an oversized unit will cycle on and off frequently, which increases electricity consumption and decreases the unit's overall efficiency. An oversized unit may also cycle off too quickly to extract sufficient humidity from the air. Look for high energy efficiency.