Portable Air Conditioning Sizing Chart

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Please use this handy sizing chart to help guide you in choosing the best unit to fit your needs. The sizing of air conditioners can be a bit tedious and confusing, it is done nowadays with computers and software. This chart is meant to be a guide only, as many factors affect the cooling load of any space. When in doubt please call and we will try to help you choose the unit that may best fit your needs
800.345.7529 / info@rileysales.com / fax 610.279.2509


Cooling Capacity Selector

*Air conditioners are sized by cooling capacity in BTU's per hour. To estimate the optimum capacity for any room, first calculate the size of the area to be conditioned by multiplying its width times its legnth, measured in feet.
*Then select the cooling capacity needed using the table below, The BTU's associated with the square footage will give an approximate optimum for the space.
*Cooling capacities are based on rooms occupied by two people and having average insulation, number of windows, and sun exposure. To adapt the table for varying conditions, modify the capacity figures with the data shown to the right ->


Cooling Capacity Selector
*Reduce capacity by 10% if area is heavily shaded.

*Increase capacity by 10% for very sunny areas.


*Add 600 btu/hr for each additional person if area is occupied routinely by more than two people.

*Add 4000 btu/hr if area to be cooled is an average size kitchen.

*Add 1000 btu/hr for every 15 sq/ft of glass exposed to sun.

*Add 3414 btu/hr for every 1000 watts of electronic equipment.
Room Area
Square Feet
Cooling Capacity (BTU range)
10X15
150
up to 5200
10X20
200
6000
15X20
300
7500
17X20
340
8000
18X25
450
10000
22X25
550
12000
25X28
700
14000
25X32
800
15000
25X34
850
16000
25X40
1000
18000
27.5X40
1100
20000
35X40
1400
24000
37.5X40
1500
28000
40X40
1600
32000