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Steps one and Two: Determine How Many BTU Needed For Size of Room
BTU stands for British Thermal Unit. It is the amount of heat needed to raise the temperature of one pound of water by 1°F. For air conditioners, BTU rating relates to the amount of heat that can be removed from the air. The more BTU an air conditioner is rated for, the more heat can be removed from the air. It is important to select the right BTU air conditioner for the size of the room to be cooled.
Why is BTU size important?
BTU SIZE TOO LARGE:  An air conditioner that has a higher BTU rating than the room size requires will tend to cycle off too quickly. The unit will not properly remove the moisture from the air.
BTU SIZE TOO SMALL:  An air conditioner that has a lower BTU rating than the room size requires will run continuously. The unit will not adequately cool the room.
The figures to the left are estimates based on average room conditions. Some exceptions are:
Kitchen
 ... Add 4,000 BTU cooling capacity to the recommended size.
High Ceilings/Unusual Floor Plans
... Increase BTU recommendation by 10%.
Warmer Climates
 ... May require 10-20% additional BTUs per room over amount listed.
Masonry, uninsulated vs. wood stud
... May require 25-30% additional BTUs.
Steps Three and Four: Make Sure Window Size and Electrical Outlet Match Correct BTU Air Conditioner
Room Area Recommended BTU for room Available Chassis and Dimensions Chassis Plug Type(s) and Electrical Requirements
10' x 15'
150 sq. ft. 		up to 5,100 Btu. For specific model numbers
click here 		X Chassis models– fits between 19" to 36" width by 12 3/4" minimum height window opening
V Chassis Models- fits Slider type windows with 15 1/2" minimum width by 21" minimum height
Plug Type A

125 Volt
15 AMP
10' x 20'
 200 sq. ft. 		6,000 Btu. For specific model numbers
click here 		X Chassis models– fits between 19" to 36" width by 12 3/4" minimum height window opening
Plug Type A

125 Volt
15 AMP
15' x 20'
 240 sq. ft. 		7,000 Btu. For specific model numbers
click here 		X Chassis models– fits between 19" to 36" width by 12 3/4" minimum height window opening
Plug Type A  
125 Volt
15 AMP
16' - 17' x 20'
 300 - 340
sq. ft 		7,500 - 8,000 Btu. For specific model numbers
click here 		X Chassis models– fits between 19" to 36" width by 12 3/4" minimum height window opening


Q Chassis models-fits between 20 1/4" to 39" width by 13" minimum height window opening
Plug Type A 

125 Volt
15 AMP
18' x 25'
 450 sq. ft. 		10,000 Btu. For specific model numbers
click here 		Q Chassis models- fits between 20 1/4" to 39" width by 13" minimum height window opening


Y Chassis models- fits between 23 7/8" to 42" width by 15 5/8" minimum height window opening
Plug Type A 

125 Volt
15 AMP
22' x 25'
 550 sq. ft. 		12,000 Btu. For specific model numbers
click here 		Y Chassis models- fits between 23 7/8" to 42" width by 15 5/8" minimum height window opening


Plug Type A

125 Volt
15 AMP

Plug Type B 

250 Volt
15 AMP

Plug Type C  
250 Volt
20 AMP
25' x 30'
 750 sq. ft. 		14,500 Btu. For specific model numbers
click here 		Y Chassis models- fits between 23 7/8" to 42" width by 15 5/8" minimum height window opening Plug Type A

125 Volt
15 AMP
25' x 40'
 1000 sq. ft. 		18,000 Btu. For specific model numbers
click here 		Y Chassis models- fits between 23 7/8" to 42" width by 15 5/8" minimum height window opening


D Chassis models- fits between 26 3/4"to 40" width by 18 5/8" minimum height window opening		 Plug Type A

125 Volt
15 AMP

Plug Type B 

250 Volt
15 AMP

Plug Type C
 
250 Volt
20 AMP

Plug Type D
 
250 Volt
30 AMP
35' x 40'
 1400 sq. ft. 		24,000 Btu. For specific model numbers
click here 		D Chassis models- fits between 26 3/4"to 40" width by 18 5/8" minimum height window opening
Plug Type C
 
250 Volt
20 AMP

Plug Type D
 
250 Volt
30 AMP
40' x 40'
 1600 sq. ft. 		32,000 Btu. For specific model numbers
click here 		K Chassis models- fits between 27 1/4"to 40" width by 21" minimum height window opening Plug Type D
 
250 Volt
30 AMP
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Fedders Corporation of Liberty Corner, N.J., provides air conditioning and other air treatment products for commercial and residential applications to markets worldwide. Product lines include residential central air conditioning systems, including condensing units, air handlers, gas furnaces, air cleaners, and humidifiers, as well as rooftop, vertical and horizontal packaged air conditioners and heat pumps for commercial, residential and telecommunications applications and also, appliance air treatment products.