### BTU & Room Size

Bigger isn’t always better! Maximize your unit’s performance with these tips from Energy Star to enjoy a room that’s cool, dry & comfortable. Portable options (think window units & rolling models) are best-suited for single-area use. #### Calculate room square footage:

• Square & rectangular rooms: Multiply length by width.
(e.g., L. 12 ft. x  W. 10 ft. = 120 sq. ft.)
• Triangular rooms: Multiply the longest length by the longest width & divide by two.
( e.g. L. 13 ft. x W. 15 ft. = 195 sq. ft. ÷ 2 = 97.5 sq. ft.
• Complex shapes: Subdivide into squares/rectangles & triangles, then use above formulas to calculate total square footage.

#### Use square footage to choose an A/C unit with the BTU capacity needed to cool that area:

 AREA to be cooled (in square feet) CHOOSE: An A/C unit with correct BTU 100 – 150 sq. ft. 5000 BTU 150 – 250 sq. ft. 6000 BTU 250 – 300 sq. ft. 7000 BTU 300 – 350 sq. ft. 7000 BTU 350 – 400 sq. ft. 8000 BTU 400 – 450 sq. ft. 9000 BTU 450 – 550 sq. ft. 10,000 BTU 550 – 700 sq. ft. 12,000 BTU 700 – 1000 sq. ft. 14,000 BTU 1000 – 1200 sq. ft. 18,000 BTU 1200 – 1400 sq. ft. 21,000 BTU 1400 – 1500 sq. ft. 23,000 BTU 1500 – 2000 sq. ft. 24,000 BTU 2000 – 2500 sq. ft. 30,000 BTU

#### Then adjust BTUs with the following considerations:

• Reduce BTU capacity by 10% for heavily shaded rooms

• Increase BTU capacity by 10% for very sunny rooms

• Add 600 BTUs for every person who regularly occupies the room
(beyond two)

• Add 4000 BTUs if unit will be used in a kitchen