What is the SEER2 rating of the Lennox ML17XP1-030-230A?

The Lennox ML17XP1-030-230A is rated at up to 16.2 SEER2 and 13.5 EER2 for cooling and up to 8.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 503 certified matchups SEER2 ranges from 15.2-16.2.

Is the Lennox ML17XP1-030-230A 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 2.5-ton model.

How much does the Lennox ML17XP1-030-230A cost to run per year?

At its rated efficiency it costs about $844-$2,097 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,019 in Phoenix and $1,734 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 ML17XP1-030-230A?

ENERGY STAR lists 503 certified combinations for this outdoor unit. The highest-rated ones use CRX35-42B-**-*+TDR, CK40DT-42B-0*+TDR, C35-36B+TDR+TXV.

What refrigerant does the Lennox ML17XP1-030-230A 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.

2.5-ton central heat pump · MERIT ML17XP1 Series

Lennox ML17XP1-030-230A

Below average cooling efficiency and average heating efficiency for a 2.5-ton central heat pump, but not rated for cold climates.

Ranks #120 of 199 2.5 ton central heat pumps for cooling efficiency, and costs about $893 a year to run in a mixed climate like Atlanta.

SEER2: 16.2 Cooling efficiency over a season
Below average · beats 36%
HSPF2: 8.6 Heating efficiency over a season
Average · beats 45%
EER2: 13.5 Cooling efficiency on a 95°F day
Excellent · beats 95%
Heat at 5°F: 15,400 BTU/h49% of its 47°F output
Excellent · beats 94%

A good fit if…

You want a choice of indoor units - 503 certified pairings.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
Cooling cost matters most - its SEER2 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

Specifications2.5 ton, R-410A

General
Brand	Lennox
Outdoor unit model	ML17XP1-030-230A
Series	MERIT ML17XP1 Series
Type	Central heat pump
Nominal size	2.5 ton
CompressorVariable-speed units run longer at low power	Single stage
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	January 6, 2022
Last certified	October 27, 2025
Cooling
SEER2Seasonal efficiency, higher is better	16.2 (range 15.2-16.2)
EER2Efficiency at 95°F outdoors	12.2-13.5
Cooling capacity	28,200-30,600 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.6
Capacity at 47°F	26,600-30,000 BTU/h
Capacity at 17°F	17,200-19,600 BTU/h
Capacity at 5°F	13,200-15,400 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.96-2.38
ENERGY STAR cold climate	No

Heating output as it gets colder49% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CRX35-42B-**-*+TDR at the standard test temperatures, in BTU/h:

Certified matchups503 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 503 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.
CRX35-42B-*-+TDR	ML180DF090E48B*	16.2	13.5	8.6	14,800	213257997
CK40DT-42B-0*+TDR	ML180DF090E48B*	16.2	13.5	8.6	14,800	214623711
C35-36B+TDR+TXV	ML180UH070V36B*	16.2	13.0	8.1	14,500	210046884
C35-36B+TDR+TXV	ML180UH090E48B*	16.2	13.0	8.1	14,100	210046887
C35-36B+TDR+TXV	EL280UH090XE48B*	16.2	13.0	8.1	14,100	210046875
CX35-36B+TDR	ML180UH070V48B*	16.2	13.0	8.1	14,400	210047251
CX35-36B+TDR	EL280UH090E36B*	16.2	13.0	8.1	14,300	210047242
C35-36B+TDR+TXV	EL280UH090E48B*	16.2	13.0	8.1	14,100	210046873
C35-36B+TDR+TXV	SL280UH090V36B*	16.2	13.0	8.1	14,500	210046906
C35-36B+TDR+TXV	EL280UH090E36B*	16.2	13.0	8.1	14,300	210046872
CX35-36B+TDR	SL280UH080NV48B*	16.2	13.0	8.1	14,500	210047266
CX35-36B+TDR	ML180UH090E48B*	16.2	13.0	8.1	14,100	210047252
CX35-36A+TDR	SL280UH060NV36A*	16.2	13.0	8.1	14,500	210047232
CX35-36B+TDR	EL280UH090E48B*	16.2	13.0	8.1	14,100	210047243
C35-36A+TDR+TXV	SL280UH060NV36A*	16.2	13.0	8.1	14,500	210046851
CX35-36B+TDR	EL280UH090XE48B*	16.2	13.0	8.1	14,100	210047244
C35-36B+TDR+TXV	SL280UH080NV48B*	16.2	13.0	8.1	14,500	210046905
CX35-36B+TDR	ML180UH070V36B*	16.2	13.0	8.1	14,500	210047250
C35-36B+TDR+TXV	ML180UH070V48B*	16.2	13.0	8.1	14,400	210046886
CX35-36B+TDR	SL280UH090V36B*	16.2	13.0	8.1	14,500	210047267
CX35-36B+TDR	ML180UH090XE48B*	16.2	13.0	8.1	14,100	212945077
C35-36B+TDR+TXV	ML180UH090XE48B*	16.2	13.0	8.1	14,100	212945069
CK40CT-36A-0*+TDR	SL280UH060NV36A*	16.2	13.0	8.1	14,500	214623784
CK40CT-36B-0*+TDR	EL280UH090E36B*	16.2	13.0	8.1	14,300	214623794
CK40CT-36B-0*+TDR	EL280UH090E48B*	16.2	13.0	8.1	14,100	214623795
CK40CT-36B-0*+TDR	EL280UH090XE48B*	16.2	13.0	8.1	14,100	214623796
CK40CT-36B-0*+TDR	ML180UH070V36B*	16.2	13.0	8.1	14,500	214623802
CK40CT-36B-0*+TDR	ML180UH070V48B*	16.2	13.0	8.1	14,400	214623803
CK40CT-36B-0*+TDR	ML180UH090XE48B*	16.2	13.0	8.1	14,100	214623807
CK40CT-36B-0*+TDR	ML180UH090E48B*	16.2	13.0	8.1	14,100	214623805
CK40CT-36B-0*+TDR	SL280UH080NV48B*	16.2	13.0	8.1	14,500	214623817
CK40CT-36B-0*+TDR	SL280UH090V36B*	16.2	13.0	8.1	14,500	214623818
CHX35-30B-*-+TDR	EL280UH090E36B*	16.2	13.0	8.0	13,500	210869855
CHX35-30B-*-+TDR	ML180UH070V48B*	16.2	13.0	8.0	13,700	210869864
CHX35-30B-*-+TDR	ML180UH070V36B*	16.2	13.0	8.0	13,700	210869863
CHX35-30B-*-+TDR	SL280UH080NV48B*	16.2	13.0	8.0	13,800	210869876
CHX35-30B-*-+TDR	SL280UH090V36B*	16.2	13.0	8.0	13,800	210869877
CK40HT-30B-0*+TDR	EL280UH090E36B*	16.2	13.0	8.0	13,500	214623632
CK40HT-30B-0*+TDR	ML180UH070V36B*	16.2	13.0	8.0	13,700	214623640
CK40HT-30B-0*+TDR	ML180UH070V48B*	16.2	13.0	8.0	13,700	214623641
CK40HT-30B-0*+TDR	SL280UH080NV48B*	16.2	13.0	8.0	13,800	214623655
CK40HT-30B-0*+TDR	SL280UH090V36B*	16.2	13.0	8.0	13,800	214623656
CHX35-30B-*-+TDR	EL280UH090E48B*	16.2	13.0	7.8	13,400	210869856
CHX35-30B-*-+TDR	EL280UH090XE48B*	16.2	13.0	7.8	13,400	210869857
CHX35-30B-*-+TDR	ML180UH070E36B*	16.2	13.0	7.8	13,400	210869862
CHX35-30B-*-+TDR	ML180UH090E48B*	16.2	13.0	7.8	13,400	210869865
CHX35-30B-*-+TDR	ML180UH090XE48B*	16.2	13.0	7.8	13,400	212945113
CHX35-30B-*-+TDR	ML180UH070XE36B*	16.2	13.0	7.8	13,400	212945112
CK40HT-30B-0*+TDR	EL280UH090XE48B*	16.2	13.0	7.8	13,400	214623634
CK40HT-30B-0*+TDR	EL280UH090E48B*	16.2	13.0	7.8	13,400	214623633
CK40HT-30B-0*+TDR	ML180UH070E36B*	16.2	13.0	7.8	13,400	214623639
CK40HT-30B-0*+TDR	ML180UH070XE36B*	16.2	13.0	7.8	13,400	214623642
CK40HT-30B-0*+TDR	ML180UH090E48B*	16.2	13.0	7.8	13,400	214623643
CK40HT-30B-0*+TDR	ML180UH090XE48B*	16.2	13.0	7.8	13,400	214623645
CBA38MV-030-230*+TDR	-	16.0	13.0	8.5	15,000	210046918
CBK45UHET-036-230-0	-	16.0	12.5	8.5	13,200	214861285
CX35-36A+TDR	ML180UH045V36A*	16.0	13.0	8.1	14,400	210047227
C35-30A+TDR+TXV	SL280UH060NV36A*	16.0	13.0	8.1	14,300	210046754
C35-30B+TDR+TXV	SL280UH090V36B*	16.0	13.0	8.1	14,300	210046814
CX35-36A+TDR	ML180UH070XE36A*	16.0	13.0	8.1	14,400	210047231

Yearly running cost in 10 large cities$844-$2,097

Phoenix, AZ$1,019/yr
Miami, FL$844/yr
Houston, TX$912/yr
Atlanta, GA$893/yr
Los Angeles, CA$862/yr
New York, NY$2,097/yr
Chicago, IL$1,695/yr
Denver, CO$1,403/yr
Seattle, WA$858/yr
Minneapolis, MN$1,734/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 ML17XP1-030-230A?: The Lennox ML17XP1-030-230A is rated at up to 16.2 SEER2 and 13.5 EER2 for cooling and up to 8.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 503 certified matchups SEER2 ranges from 15.2-16.2.
Is the Lennox ML17XP1-030-230A 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 2.5-ton model.
How much does the Lennox ML17XP1-030-230A cost to run per year?: At its rated efficiency it costs about $844-$2,097 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,019 in Phoenix and $1,734 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 ML17XP1-030-230A?: ENERGY STAR lists 503 certified combinations for this outdoor unit. The highest-rated ones use CRX35-42B-**-*+TDR, CK40DT-42B-0*+TDR, C35-36B+TDR+TXV.
What refrigerant does the Lennox ML17XP1-030-230A 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 $999/yrYou save $487/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 ML17XP1-030-230A

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: $999
Current system, per year: $1,486
You save per year: $487
Payback: 22.6 years
Net after 10 years: -$6,131

Cooling $634Heating $365Electricity used: 6,245 kWhSaved vs. a minimum-efficiency heat pump: $138

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.

Similar 2.5 ton models

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GE NS17H30SA4-**A16.2 SEER2 · 8.6 HSPF2
MRCOOL MVP-30-HP-C-230A00-O16.2 SEER2 · 8.4 HSPF2
Concord 4HP17L30P-**A16.2 SEER2 · 8.6 HSPF2
MRCOOL MHP17030A-**A16.2 SEER2 · 8.1 HSPF2
Comfort-Aire HRG1530S1R-**A16.2 SEER2 · 8.6 HSPF2
Bosch BOVA-36HDN1-M15G · cold climate16.1 SEER2 · 9.0 HSPF2
Blueridge BHP17L30P-**A16.2 SEER2 · 8.6 HSPF2

See all 199 2.5 ton central heat pumps, ranked

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