Sizing and Air Conditioner

Usually, the air conditioner is sized by an engineer during the design process of the home when it was constructed.  It takes into consideration the size of the home, type of materials used in the structure (wall insulation factors, attic insulation factors, etc) and outdoor temperature averages.  The engineering mechanical (blueprint) plan of your property will indicate what size air conditioner was specified.

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What you must know:

  • Each ton of air conditioning is equal to approximately 12,000 BTU's. In an example, a 4.0 TON Air conditioner will output approximately 4 x 12,000 BTU's = 48,000 BTU's
  • Air conditioners come in tonnage size including 1.5 Ton (approx 18,000 BTU's), 2.0 Ton (approx 24,000 BTU's), 2.5 Ton (approx 30,000 BTU's), 3.0 Ton (approx 36,000 BTU's), 3.5 Ton (approx 42,000 BTU's), 4.0 Ton (approx 48,000 BTU's), and 5.0 Ton (approx 60,000 BTU's).
  • A genertal public, very good average rule of thumb to know the size of equipment needed for your air-conditioned space is to multiply the square footage (S/F) by 22 Btu's. In example 1,550 S/F x 22 Btus = 34,100 BTU's needed so in this case,a 3.0 Ton unit would be appropriate.  In Some homes, specially older ones, that are not well insulated (heat infiltration is greater), then a 3.5 Ton system is appropiate in this scenario.

For existing homes the best way to get the size of your current air conditioner is to get it from your condenser model number.  Most condensers will have the size nomination amongst the model number for easy reference.  Contact us and send us your model number and we will tell you the size.


American Standard Condenser Model 4A7A4060H1000B = 60 = 5.0 TON (the number 60 means 5.0 TON because 60,000 ÷ 12,000 BTU's per Ton = 5.0 TON)

American Standard Condenser Model 4A6H5024J1000A = 24 = 2.0 TON (the number 24 means 2 0TON because 24,000 ÷ 12,000 BTU's per Ton = 2.0 TON)

American Standard Condenser Model 4A6H7036J1000B = 36 = 3.0 TON (the number 36 means 3.0 ton because 36,000 ÷ 12,000 BTU's per Ton = 3.0 TON)

American Standard Condenser Model 4A6H4042J1000A = 42 = 3.5 TON (the number 36 means 3.5 ton because 42,000 ÷ 12,000 BTU's per Ton = 3.5 TON)


The higher the SEER rating, the higher the efficiency of the unit. says about the importance of saving energy:

"Three-quarters of all homes in the United States have air conditioners. Air conditioners use about 6% of all the electricity produced in the United States, at an annual cost of about $29 billion to homeowners. As a result, roughly 117 million metric tons of carbon dioxide are released into the air each year. To learn more about air conditions, explore our Energy Saver 101 infographic on home cooling."

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Note: Most electric companies give rebates for installing heat pump units with 15 SEER, 16 SEER or Higher Efficiency - meaning extra savings in your pocket.

Link for Duke Energy: 

Link for Kissimmee Utilities Authorities:

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