How much a new furnace costs for a 2000 sq ft house in 2026 is 3,500 to 7,500 dollars installed including furnace, labor, permit, and removal, with size typically 60,000 to 80,000 BTU for average insulation. For 2000 sq ft, you need about 60,000 to 80,000 BTU input depending on climate and insulation: cold climate like Minnesota needs 60 to 70 BTU per sq ft, so 120,000 BTU for old poorly insulated, but for well-insulated new home needs 30 to 40 BTU per sq ft, so 60,000 to 80,000 BTU. Costs: budget single stage 80 to 96 percent AFUE like Goodman GMSS96 80,000 BTU costs 3,500 to 5,000 dollars installed. Mid-range two-stage 96 percent AFUE like Trane S9X2 or Lennox EL296V 80,000 BTU costs 4,500 to 6,500 dollars installed, offering better comfort with two-stage that runs low most time. Premium modulating 97 to 99 percent AFUE like Lennox SLP99V or Trane XC95m 80,000 BTU costs 5,500 to 8,500 dollars installed, with modulating gas valve for ultimate even heating within 0.5 degrees and quiet at 60 decibels. Additional costs include thermostat at 200 to 500 dollars, ductwork modifications at 300 to 800 dollars, and permit at 100 to 300 dollars. Prices vary by region: California and Northeast 15 to 20 percent higher. Always get Manual J calculation for exact size, as 2000 sq ft well-insulated may only need 60,000 BTU.
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