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Furnace Sizing Calculator






Air Conditioning Square Footage Range
by Climate Zone

ZONE 1  ZONE 2 ZONE 3 ZONE 4 ZONE 5
1.5 Tons 600 - 900 sf 600 - 950 sf 600 - 1000 sf 700 - 1050 sf 700 - 1100 sf
2 Tons 901-1200 sf 951 - 1250 sf 1001 - 1300 sf 1051 - 1350 sf 1101 - 1400 sf
2.5 Tons 1201 - 1500 sf 1251 - 1550 sf 1301 - 1600 sf 1351 - 1600 sf 1401 - 1650 sf
3 Tons 1501 - 1800 sf 1501 - 1850 sf 1601 - 1900 sf 1601 - 2000 sf 1651 - 2100 sf
3.5 Tons 1801 - 2100 sf 1851 - 2150 sf 1901 - 2200 sf 2001 - 2250 sf 2101 - 2300 sf
4 Tons 2101 - 2400 sf 2151 - 2500 sf 2201 - 2600 sf 2251 - 2700 sf 2301 - 2700 sf
5 Tons 2401 - 3000 sf 2501 - 3100 sf 2601 - 3200 sf 2751 - 3300 sf 2701 - 3300 sf

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