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It can handle five tons, or a 60000 btu ac. Tonnage is a measurment for the ac, 1 ton-12000 btus. The ac dose the cooling. the furnace simply blows the air, so if its a good furnace, and sized right, no need to replace it. Simply add the split system to the existing furnace. If you want the tonnage of the ac size, let me know your homes squarefootage, age, condition. Do NOT include the basement in the sq. ft.
Look for your model number on your condensor, outdoor unit. Your tonnage will be towards the end of it and divisable by 6. I.E. 36=3tons or 42=3.5tons. Ac units are messured by the half ton. If you have a split system I.E. heater inside and ac outside your system will be 1 - 5 tons. If this doesn't help post your model and serial number. I can then give you tonnage, age, so forth.
This is a 3 and 1/2 ton unit. The 042 in the model number is the tonnage of your carrier unit. AC tonnage is based on 12,000 btu per ton. 12,000.....1 ton 18,000.....1 and 1/2 ton 24,000.....2 ton 30,000.....2 and 1/2 ton 36,000.....3 ton 42,000.....3 and 1/2 ton 48,000.....4 ton 60,000.....5 ton. There is no 4 and 1/2 ton unit.