You must first clearly understand what you require from your new AC unit. The simplest inquiry: How well does it chill a room? All window air conditioners are measured in British thermal units, which typically range from 5,000 to 12,000. BTUs are energy measurement that simply indicates how well a device can reduce the temperature in a specific location. https://outdoorgearreviews.org/best-12000-btu-window-air-conditioner/