ESB stands for extra special bitter. This style is known for its balance and the interplay between malt and hop bitterness. ESB stands for extra special bitter.
I have a large room with a valted ceiling 23ft.X20ft. with southern exsposure that gets lots of sun on two sides of the room. We are having 90* to 100* days for several months I needed the largest AC window unit I could find that runs on 120V. This Friidaire 15,100-BTU was the largest I could find and it works great. I can set the timer to come on three to four hours before I get home and the room is very cool when I get home. Unit runs fairly quit and works great to cool the room down as cool as you want it or can stand it.
The simple number we would like is a number of btu's per hour per square foot of window. Then you multiply by the total square feet of windows and you know how many btu's per hour are coming in, and therefore how many btu's per hour your air conditioner must have to remove that heat. Of course your air conditioner must also remove heat that conducts through the walls, etc.