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Find the model number. Within this string of letters and numerals, you should find an even, two-digit number. The possibilities on residential units range from 18 to 60. Divide the number by 12 (which represents 12,000 Btu/hr, or one ton of cooling capacity) to get your AC unit’s tonnage.Click to see full answer. Keeping this in consideration, how many square feet will a 3 ton AC cool? METHOD 2: Go by square feet + climate HVAC System Sizing Blue Green 2.5 tons 1401-1650 sf 1351-1600 sf 3 tons 1651-2100 sf 1601-2000 sf 3.5 tons 2101-2300 sf 2001-2250 sf Similarly, how do I know the BTU of my air conditioner? The digits you need The 3 digits in the model number tell you the nominal capacity in thousands of BTU/hr. Since each 12,000 BTU/hr is equivalent to 1 ton of air conditioner capacity, it’s easy to figure out how many tons of nominal capacity your AC has. In this regard, how do you read AC Labels? How to Find the Tons on an A/C Unit Find the label on your air condenser unit and look for the BTU rating and the tonnage rating. The air condenser in a split system air conditioning apparatus is the unit located outside your house. Divide the BTUs on the label by 12,000. Find the model number on your label. How many tons do I need for AC?Understand here that the standard practice among HVAC contractors sizing air conditioners for new homes is to use a rule of thumb. It’s often in the neighborhood of 1 ton of air conditioning capacity for each 600 square feet of conditioned floor area, usually abbreviated 600 sf/ton.

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