How much a Lennox heat pump costs in 2026 depends on model, size, and efficiency, ranging from 5,000 to 12,000 dollars installed including outdoor unit, indoor air handler or coil, labor, refrigerant, and permit. For entry level, Lennox Merit ML14XP1 14 SEER single stage 3-ton costs 5,000 to 7,000 dollars installed, offering basic heating and cooling with single stage compressor and 10-year parts warranty when registered. For mid-range, Lennox Elite EL16XP1 17 SEER two-stage 3-ton costs 6,500 to 9,000 dollars installed, with two-stage compressor that runs at low stage most time for better humidity control and quieter operation at 70 decibels. For high efficiency, Lennox Signature XP20 20 SEER variable speed 3-ton costs 8,000 to 11,000 dollars installed, with variable speed compressor that adjusts from 35 to 100 percent capacity for ultimate comfort and 62 decibels quiet operation. For premium most efficient, Lennox XP25 23.5 SEER variable speed costs 9,500 to 13,000 dollars installed, highest efficiency in industry. Prices vary by region: California and Northeast 15 to 20 percent higher than South. Additional costs include backup electric heat strips at 300 to 600 dollars, thermostat at 200 to 500 dollars for iComfort S30, and ductwork modifications at 300 to 800 dollars. Compared to Goodman at 3,500 to 6,500 dollars, Lennox costs 40 to 70 percent more.
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