360
approx. 172.5 square feet
20ft long by 11ft wide
18 feet x 11 feet = 198 square feet.
5500 to 7000 BTU unit is fine
To convert feet to square meters, you need to multiply by 0.0929. In this case, a 10ft x 11ft room would be 110 square feet. Multiplying 110 square feet by 0.0929 gives you approximately 10.22 square meters in a 10ft x 11ft room.
360
approx. 172.5 square feet
10x12 room
13ft * 11ft = 143 Sq feet.143 square foot = 13.28513472 square meter
5ft by 6ft
110 sq ft
6 x 6 = 36 square feet.
20ft long by 11ft wide
Approximately 126.39 square feet.
121ft² = 11.2m²
18 feet x 11 feet = 198 square feet.