What is the SEER2 rating of the Lennox ML17XP1-024-230A?

The Lennox ML17XP1-024-230A is rated at up to 17.0 SEER2 and 14.0 EER2 for cooling and up to 8.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 469 certified matchups SEER2 ranges from 15.2-17.0.

Is the Lennox ML17XP1-024-230A good for cold climates?

It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 2-ton model.

How much does the Lennox ML17XP1-024-230A cost to run per year?

At its rated efficiency it costs about $646-$1,676 a year in electricity in large U.S. cities, depending on climate and local rates - for example $789 in Phoenix and $1,395 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Which indoor units work with the Lennox ML17XP1-024-230A?

ENERGY STAR lists 469 certified combinations for this outdoor unit. The highest-rated ones use CHX35-30B-**-*+TDR, CK40HT-30B-0*+TDR, CHX35-30A-**-*+TDR.

What refrigerant does the Lennox ML17XP1-024-230A use?

It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

2-ton central heat pump · MERIT ML17XP1 Series

Lennox ML17XP1-024-230A

Average cooling efficiency and below average heating efficiency for a 2-ton central heat pump, but not rated for cold climates.

Ranks #237 of 331 2 ton central heat pumps for cooling efficiency, and costs about $706 a year to run in a mixed climate like Atlanta.

SEER2: 17.0 Cooling efficiency over a season
Average · beats 49%
HSPF2: 8.2 Heating efficiency over a season
Below average · beats 28%
EER2: 14.0 Cooling efficiency on a 95°F day
Excellent · beats 98%
Heat at 5°F: 11,500 BTU/h48% of its 47°F output
Very good · beats 71%

A good fit if…

You want a choice of indoor units - 469 certified pairings.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
You mainly need heat - its HSPF2 is below average for central heat pumps.
You want the newest refrigerant - it uses R-410A, which is being phased down.
Comfort and noise matter - a single-stage compressor runs only full-on or off.

Calculate my running cost

Details

Specifications2 ton, R-410A

General
Brand	Lennox
Outdoor unit model	ML17XP1-024-230A
Series	MERIT ML17XP1 Series
Type	Central heat pump
Nominal size	2 ton
CompressorVariable-speed units run longer at low power	Single stage
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	February 25, 2022
Last certified	October 27, 2025
Cooling
SEER2Seasonal efficiency, higher is better	17.0 (range 15.2-17.0)
EER2Efficiency at 95°F outdoors	12.5-14.0
Cooling capacity	22,400-24,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.2
Capacity at 47°F	21,000-22,600 BTU/h
Capacity at 17°F	13,400-14,700 BTU/h
Capacity at 5°F	10,200-11,500 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.00-2.18
ENERGY STAR cold climate	No

Heating output as it gets colder48% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CHX35-30B-**-*+TDR at the standard test temperatures, in BTU/h:

Certified matchups469 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 469 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

Indoor unit	Furnace	SEER2	EER2	HSPF2	Heat @5°F	AHRI ref.
CHX35-30B-*-+TDR	ML180UH090XE48B*	17.0	14.0	8.0	10,400	212945054
CHX35-30B-*-+TDR	EL280UH090E48B*	17.0	14.0	8.0	10,300	210040217
CHX35-30B-*-+TDR	SL280UH090V36B*	17.0	14.0	8.0	10,400	210040256
CHX35-30B-*-+TDR	EL280UH090XE48B*	17.0	14.0	8.0	10,300	210040219
CHX35-30B-*-+TDR	ML180UH090E48B*	17.0	14.0	8.0	10,400	210040233
CHX35-30B-*-+TDR	ML180UH070V36B*	17.0	14.0	8.0	10,400	210040230
CK40HT-30B-0*+TDR	SL280UH090V36B*	17.0	14.0	8.0	10,400	214623477
CK40HT-30B-0*+TDR	EL280UH090E48B*	17.0	14.0	8.0	10,300	214623454
CK40HT-30B-0*+TDR	EL280UH090XE48B*	17.0	14.0	8.0	10,300	214623455
CK40HT-30B-0*+TDR	ML180UH070V36B*	17.0	14.0	8.0	10,400	214623461
CK40HT-30B-0*+TDR	ML180UH090E48B*	17.0	14.0	8.0	10,400	214623464
CK40HT-30B-0*+TDR	ML180UH090XE48B*	17.0	14.0	8.0	10,400	214623466
CHX35-30A-*-+TDR	SL280UH060NV36A*	16.8	14.0	8.1	10,400	210040199
CK40HT-30A-0*+TDR	SL280UH060NV36A*	16.8	14.0	8.1	10,400	214623443
CHX35-30B-*-+TDR	ML180UH070XE36B*	16.8	13.5	8.0	10,400	212945053
CHX35-30B-*-+TDR	ML180UH070V48B*	16.8	14.0	8.0	10,400	210040232
CHX35-30B-*-+TDR	SL280UH080NV48B*	16.8	14.0	8.0	10,400	210040254
CHX35-30B-*-+TDR	ML180UH070E36B*	16.8	13.5	8.0	10,400	210040228
CK40HT-30B-0*+TDR	SL280UH080NV48B*	16.8	14.0	8.0	10,400	214623476
CK40HT-30B-0*+TDR	ML180UH070V48B*	16.8	14.0	8.0	10,400	214623462
CK40HT-30B-0*+TDR	ML180UH070XE36B*	16.8	13.5	8.0	10,400	214623463
CK40HT-30B-0*+TDR	ML180UH070E36B*	16.8	13.5	8.0	10,400	214623460
CHX35-30B-*-+TDR	EL297UH070XV36B*	16.8	13.5	7.8	10,400	213194426
CHX35-30B-*-+TDR	SLP99UH070XV36B*	16.8	13.5	7.8	10,400	210040265
CHX35-30B-*-+TDR	EL280UH090E36B*	16.8	13.5	7.8	10,300	210040215
CK40HT-30B-0*+TDR	SLP99UH070XV36B*	16.8	13.5	7.8	10,400	214623481
CK40HT-30B-0*+TDR	EL280UH090E36B*	16.8	13.5	7.8	10,300	214623453
CK40HT-30B-0*+TDR	EL297UH070XV36B*	16.8	13.5	7.8	10,400	214623459
CHX35-30A-*-+TDR	EL280UH045E36A*	16.6	13.5	8.1	10,400	210040181
CHX35-30A-*-+TDR	ML180UH045V36A*	16.6	13.5	8.1	10,400	210040191
CHX35-30A-*-+TDR	ML180UH070V36A*	16.6	13.5	8.1	10,400	210040195
CHX35-30A-*-+TDR	ML180UH030V36A*	16.6	13.5	8.1	10,400	210040187
CK40HT-30A-0*+TDR	EL280UH045E36A*	16.6	13.5	8.1	10,400	214623433
CK40HT-30A-0*+TDR	ML180UH045V36A*	16.6	13.5	8.1	10,400	214623438
CK40HT-30A-0*+TDR	ML180UH030V36A*	16.6	13.5	8.1	10,400	214623436
CK40HT-30A-0*+TDR	ML180UH070V36A*	16.6	13.5	8.1	10,400	214623441
C35-30B+TDR+TXV	ML180UH090XE48B*	16.6	13.5	8.0	10,400	212945050
CX35-30B+TDR	ML180UH090XE48B*	16.6	13.5	8.0	10,400	212945060
C35-30A+TDR+TXV	SL280UH060NV36A*	16.6	13.5	8.0	10,200	210039927
C35-30B+TDR+TXV	ML180UH090E48B*	16.6	13.5	8.0	10,400	210039969
CX35-30B+TDR	SL280UH090V36B*	16.6	13.5	8.0	10,400	210040506
C35-30B+TDR+TXV	SL280UH090V36B*	16.6	13.5	8.0	10,400	210039995
CX35-30B+TDR	ML180UH090E48B*	16.6	13.5	8.0	10,400	210040480
CX35-30A+TDR	SL280UH060NV36A*	16.6	13.5	8.0	10,200	210040435
CHX35-30B-*-+TDR	ML193UH070XE36B*	16.6	13.5	8.0	10,600	210040240
CK40HT-30B-0*+TDR	ML193UH070XE36B*	16.6	13.5	8.0	10,600	214623469
CK40CT-30B-0*+TDR	SL280UH090V36B*	16.6	13.5	8.0	10,400	214623605
CK40CT-30A-0*+TDR	SL280UH060NV36A*	16.6	13.5	8.0	10,200	214623571
CK40CT-30B-0*+TDR	ML180UH090E48B*	16.6	13.5	8.0	10,400	214623592
CK40CT-30B-0*+TDR	ML180UH090XE48B*	16.6	13.5	8.0	10,400	214623594
CHX35-30B-*-+TDR	EL297UH045XV36B*	16.6	13.5	7.8	10,400	213194425
CHX35-30B-*-+TDR	SL297UH040NV36B*	16.6	13.5	7.8	10,400	210040261
CHX35-30B-*-+TDR	SL297UH060NV36B*	16.6	13.5	7.8	10,400	210040263
CX35-30A+TDR	ML180UH030V36A*	16.6	13.5	7.8	10,200	210040421
C35-30A+TDR+TXV	ML180UH030V36A*	16.6	13.5	7.8	10,200	210039914
CX35-30A+TDR	ML180UH045V36A*	16.6	13.5	7.8	10,200	210040426
C35-30A+TDR+TXV	ML180UH045V36A*	16.6	13.5	7.8	10,200	210039919
C35-30B+TDR+TXV	ML180UH070V36B*	16.6	13.5	7.8	10,400	210039964
CX35-30B+TDR	ML180UH070V36B*	16.6	13.5	7.8	10,400	210040474
CK40HT-30B-0*+TDR	SL297UH040NV36B*	16.6	13.5	7.8	10,400	214623479

Yearly running cost in 10 large cities$646-$1,676

Phoenix, AZ$789/yr
Miami, FL$646/yr
Houston, TX$707/yr
Atlanta, GA$706/yr
Los Angeles, CA$685/yr
New York, NY$1,676/yr
Chicago, IL$1,359/yr
Denver, CO$1,128/yr
Seattle, WA$692/yr
Minneapolis, MN$1,395/yr

At each state's average electricity price and the city's typical heating and cooling hours.

Questions5

What is the SEER2 rating of the Lennox ML17XP1-024-230A?: The Lennox ML17XP1-024-230A is rated at up to 17.0 SEER2 and 14.0 EER2 for cooling and up to 8.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 469 certified matchups SEER2 ranges from 15.2-17.0.
Is the Lennox ML17XP1-024-230A good for cold climates?: It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 2-ton model.
How much does the Lennox ML17XP1-024-230A cost to run per year?: At its rated efficiency it costs about $646-$1,676 a year in electricity in large U.S. cities, depending on climate and local rates - for example $789 in Phoenix and $1,395 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Which indoor units work with the Lennox ML17XP1-024-230A?: ENERGY STAR lists 469 certified combinations for this outdoor unit. The highest-rated ones use CHX35-30B-**-*+TDR, CK40HT-30B-0*+TDR, CHX35-30A-**-*+TDR.
What refrigerant does the Lennox ML17XP1-024-230A use?: It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

Running cost and savings

Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

Heat pump $780/yrYou save $398/yrSee details ↓

1. Where you live

StateCityElectricity ¢ per kWh

Adjust heating and cooling hours

Filled in from your city's climate. Change them if you run the system much more or less than usual.

Cooling hours full-load hours per yearHeating hours full-load hours per year

2. The heat pump Lennox ML17XP1-024-230A

Find a model (fills in the ratings below)

SEER2 cooling efficiencyHSPF2 heating efficiencyCooling capacity BTU/hHeating capacity BTU/h

3. What it replaces

Current heatingFurnace efficiency (AFUE %)Gas price, $/thermCurrent coolingOld AC rating SEER2 (10 ≈ 15+ years old)

4. Price replace the example with your quote

Installed price, $Rebates and incentives, $ utility, state

Heat pump, per year: $780
Current system, per year: $1,177
You save per year: $398
Payback: 22.6 years
Net after 10 years: -$5,024

Cooling $485Heating $295Electricity used: 4,872 kWhSaved vs. a minimum-efficiency heat pump: $119

Estimates use the unit's rated SEER2 and HSPF2, full-load hours derived from NOAA 1991-2020 degree days, average residential electricity prices from the U.S. EIA (12 months to July 2026) and fuel prices from EIA (2025 for natural gas, week of 2026-10-05 for propane and heating oil). Very cold days that need backup heat are not modelled. Federal minimum for comparison: 14.3 SEER2 / 7.5 HSPF2.

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Concord 4HP17L24P-**A17.0 SEER2 · 8.2 HSPF2
MRCOOL MHP17024A-**A17.0 SEER2 · 8.0 HSPF2
Comfort-Aire HRG1524S1R-**A17.0 SEER2 · 8.2 HSPF2
WeatherMaker PH7TAN424**AA17.0 SEER2 · 7.8 HSPF2
Blueridge BHP17L24P-**A17.0 SEER2 · 8.2 HSPF2

See all 331 2 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of October 27, 2025. How we use the data.