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As for size look at the outdoor unit model #, in it will be a 2 digit # that is divisble by 6 (for 1/2 ton sizes). That # is the cooling capacity of the unit in 1000`s of btu. A ton of refrigeraton equals 12,000 btu, so by taking that 2 digit # and dividing it by 12 you get your tonnage.Example: a 24 in the model# would be 2 tons, a 30 would be 2.5 tons etc up to 5 tons(60). Age is noted in the serial #, though you may need to get a copy of Tranes serial # nomenclature or code to decipher it. But chances are if there are 2 digits that resemble a year around which the unit was built that is probably it.

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