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We serve MA, NH, CT, RI, ME, VT, NJ, PA, and TX
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Premium
Ultimate efficiency meets whisper-quiet premium comfort
The Lennox XP25 is a premium variable-capacity heat pump with the highest SEER2 in our lineup at 20.5. Paired with Lennox's iComfort smart thermostat, it delivers precise temperature and humidity control. The XP25 isn't cold-climate rated but excels in moderate climates.
HSPF2
11
SEER2
20.5
Min Temp
-10°F
Noise
51 dB
Installed
$6,000–$13,500
HSPF2 (Heating Efficiency)
11
Excellent — federal minimum is 7.5 HSPF2
SEER2 (Cooling Efficiency)
20.5
Best in class — federal minimum is 14.3 SEER2
Min Operating Temperature
-10°F
Cold-climate capable for most of New England
Noise Level
51 dB
Very quiet — comparable to a refrigerator hum
Compressor Warranty
10 Years
5-year parts warranty — register within 90 days of install
Installed Price Range
$6,000–$13,500
Includes equipment, labor, and permits — varies by size and complexity
Heating capacity, cooling capacity, and COP at standard AHRI test temperatures
| Size | Heating @ 47°F | Heating @ 17°F | Heating @ 5°F | Heating @ -5°F | Cooling @ 95°F | COP @ 47°F | COP @ 17°F | COP @ 5°F | COP @ -5°F | Est. Price |
|---|---|---|---|---|---|---|---|---|---|---|
| 2 Ton | 24,000 BTU/h | 17,400 BTU/h | 14,400 BTU/h | 12,000 BTU/h | 24,000 BTU/h | 3.8 | 2.5 | 2 | 1.6 | $6,000 |
| 3 Ton | 36,000 BTU/h | 26,100 BTU/h | 21,600 BTU/h | 18,000 BTU/h | 36,000 BTU/h | 3.7 | 2.4 | 1.9 | 1.5 | $8,500 |
| 4 Ton | 48,000 BTU/h | 34,800 BTU/h | 28,800 BTU/h | 24,000 BTU/h | 48,000 BTU/h | 3.6 | 2.3 | 1.8 | 1.4 | $11,000 |
| 5 Ton | 60,000 BTU/h | 43,500 BTU/h | 36,000 BTU/h | 30,000 BTU/h | 60,000 BTU/h | 3.5 | 2.2 | 1.7 | 1.3 | $13,500 |
Capacity and COP values based on manufacturer-published data at AHRI standard conditions. Installed prices are estimates and may vary.
“The XP25 pairs exclusively with Lennox air handlers for full variable-capacity operation. Our team typically installs the iComfort S30 thermostat at the same time. The unit is larger than some competitors, so we confirm clearance during the site survey. Expect 1–2 day install.”
— NuWatt Energy Install Team
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The Lennox XP25 costs between $6,000 and $13,500 fully installed by NuWatt Energy. The final price depends on your home’s size, the tonnage you need, and installation complexity. Note that the federal 25C heat pump tax credit expired at the end of 2025, so there is no federal credit available in 2026. However, state rebates and utility incentives may still apply.
The Lennox XP25 is available in 4 sizes from 2 to 5 ton. A general guideline is 1 ton per 500–600 square feet, but proper sizing depends on your home’s insulation, climate zone, and layout. NuWatt performs a Manual J load calculation during your free consultation to determine the exact size.
The Lennox XP25 operates down to -10°F, which covers many areas of southern New England (CT, RI, coastal MA). For northern NH, VT, or ME where temps regularly dip below 0°F, we recommend a cold-climate rated model like the Mitsubishi Hyper-Heat or Carrier Greenspeed instead.
The Lennox XP25 comes with a 10-year compressor warranty and a 5-year parts warranty. NuWatt also provides our own workmanship warranty covering installation labor. Be sure to register your product with Lennox within 90 days of installation to activate the full warranty.
The Lennox XP25 has an HSPF2 of 11 (heating) and SEER2 of 20.5 (cooling). For context, the minimum federal standard is 7.5 HSPF2 and 14.3 SEER2, so this unit is 47% more efficient for heating and 43% more efficient for cooling than the baseline. Higher efficiency means lower monthly energy bills.
The outdoor unit operates at 51 dB, which is quieter than a normal conversation (about 60 dB) and comparable to a quiet office. For comparison, the quietest unit in our lineup is 49 dB (Fujitsu Halcyon) and the loudest is 60 dB (Goodman GSZC18).
