![]() If the condenser is older and has had years of direct sun exposure, the numbers may be faded away, like in the photo below. Here’s a rundown of the range you will encounter: 18 = 1.5 tons, 24 = 2 tons, 30 - 2.5 tons, 36 = 3 tons, 42 = 3.5 tons, 48 = 4 tons, and 60 = 5 tons. A ton of air conditioning equals 12,000 BTU, and 48 divided by 12 equals 4, so the data plate below indicates the system is 4 tons. It will be a number divisible by 6 or 12, and represents the nominal BTU of the system in thousands. Look for the 7th and 8th digits, or maybe 8th and 9th digits, of the model number. ![]() You can determine the size in tons of your Carrier HVAC system by examining the model number on the data sticker at the side of the a/c condenser (outdoor unit).
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