How much it costs to install a Lennox heat pump in 2026 ranges from 5,000 to 13,000 dollars installed including outdoor unit, indoor air handler or evaporator coil, labor, refrigerant, electrical, and permit, depending on model and size. For 3-ton size, entry level Lennox Merit ML14XP1 14 SEER single stage costs 5,000 to 7,000 dollars installed, including outdoor condenser, indoor coil on existing furnace, line set reuse, refrigerant charge of 6 to 12 pounds of R-410A, and labor of 1,000 to 2,000 dollars. Mid-range Lennox Elite EL16XP1 17 SEER two-stage 3-ton costs 6,500 to 9,000 dollars installed. High efficiency Lennox Signature XP20 20 SEER variable speed 3-ton costs 8,000 to 11,000 dollars installed, with variable speed compressor and communicating. Premium Lennox XP25 23.5 SEER most efficient costs 9,500 to 13,000 dollars installed. If replacing air handler as complete system, add 1,000 to 2,000 dollars. Additional costs include backup electric heat strips at 300 to 600 dollars for cold climate below 30 degrees, new thermostat iComfort S30 at 300 to 500 dollars, ductwork modifications at 300 to 800 dollars, electrical disconnect at 150 to 300 dollars, and permit at 100 to 300 dollars. Prices vary by region: California and Northeast 15 to 20 percent higher. Compared to Goodman at 3,500 to 6,500 dollars, Lennox costs 40 to 70 percent more but offers higher efficiency.
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