When buying an air conditioner, you’ll match up the unit’s BTUs with how much square footage is in your room. More on that below. Consumer Reports recommends 20 BTUs per square foot of the ...

For a small bedroom, home office, or guest room, ranging from 100 to 250 square feet ... (in British thermal units (Btu) per hour) to the power input (in watts). The higher the EER rating, the more ...