What is the SEER2 rating of the Lennox ML17XP1-036-230A?

The Lennox ML17XP1-036-230A is rated at up to 16.8 SEER2 and 13.5 EER2 for cooling and up to 8.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 757 certified matchups SEER2 ranges from 15.2-16.8.

Is the Lennox ML17XP1-036-230A 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 3-ton model.

How much does the Lennox ML17XP1-036-230A cost to run per year?

At its rated efficiency it costs about $1,004-$2,488 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,210 in Phoenix and $2,058 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 ML17XP1-036-230A?

ENERGY STAR lists 757 certified combinations for this outdoor unit. The highest-rated ones use CHX35-42C-**-*+TDR, C35-48C+TDR+TXV, CX35-48C+TDR.

What refrigerant does the Lennox ML17XP1-036-230A 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.

3-ton central heat pump · MERIT ML17XP1 Series

Lennox ML17XP1-036-230A

Average cooling and heating efficiency for a 3-ton central heat pump, but not rated for cold climates.

Ranks #181 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,060 a year to run in a mixed climate like Atlanta.

SEER2: 16.8 Cooling efficiency over a season
Average · beats 45%
HSPF2: 8.7 Heating efficiency over a season
Average · beats 47%
EER2: 13.5 Cooling efficiency on a 95°F day
Excellent · beats 95%
Heat at 5°F: 19,300 BTU/h54% of its 47°F output
Excellent · beats 93%

A good fit if…

You want a choice of indoor units - 757 certified pairings.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
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

Specifications3 ton, R-410A

General
Brand	Lennox
Outdoor unit model	ML17XP1-036-230A
Series	MERIT ML17XP1 Series
Type	Central heat pump
Nominal size	3 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	16.8 (range 15.2-16.8)
EER2Efficiency at 95°F outdoors	12.2-14.0
Cooling capacity	34,800-36,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	7.8-8.7
Capacity at 47°F	32,400-36,000 BTU/h
Capacity at 17°F	21,400-24,000 BTU/h
Capacity at 5°F	16,800-19,300 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.06-2.36
ENERGY STAR cold climate	No

Heating output as it gets colder54% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CHX35-42C-**-*+TDR at the standard test temperatures, in BTU/h:

Certified matchups757 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 757 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.
CHX35-42C-*-+TDR	EL280UH110E48C*	16.8	13.5	8.0	17,600	211001913
C35-48C+TDR+TXV	EL280UH110E48C*	16.8	14.0	8.0	16,800	213804906
C35-48C+TDR+TXV	EL280UH110E60C*	16.8	14.0	8.0	17,000	213804907
C35-48C+TDR+TXV	EL280UH110XE60C*	16.8	14.0	8.0	17,000	213804908
C35-48C+TDR+TXV	ML180UH110V60C*	16.8	13.5	8.0	17,000	213804919
CX35-48C+TDR	EL280UH110E48C*	16.8	14.0	8.0	16,800	213804947
CX35-48C+TDR	EL280UH110E60C*	16.8	14.0	8.0	17,000	213804948
CX35-48C+TDR	EL280UH110XE60C*	16.8	14.0	8.0	17,000	213804949
CX35-48C+TDR	ML180UH110V60C*	16.8	13.5	8.0	17,000	213804960
CK40HT-42C-0*+TDR	EL280UH110E48C*	16.8	13.5	8.0	17,600	214623862
CK40CT-48C-0*+TDR	ML180UH110V60C*	16.8	13.5	8.0	17,000	214624091
CK40CT-48C-0*+TDR	EL280UH110E48C*	16.8	14.0	8.0	16,800	214624078
CK40CT-48C-0*+TDR	EL280UH110XE60C*	16.8	14.0	8.0	17,000	214624080
CK40CT-48C-0*+TDR	EL280UH110E60C*	16.8	14.0	8.0	17,000	214624079
C35-48C+TDR+TXV	ML180UH090E60C*	16.8	13.5	7.8	16,800	213804917
C35-48C+TDR+TXV	ML296UH110XV60C*	16.8	13.5	7.8	16,800	213804929
CX35-48C+TDR	ML180UH090E60C*	16.8	13.5	7.8	16,800	213804958
CX35-48C+TDR	ML296UH110XV60C*	16.8	13.5	7.8	16,800	213804970
CK40CT-48C-0*+TDR	ML180UH090E60C*	16.8	13.5	7.8	16,800	214624089
CK40CT-48C-0*+TDR	ML296UH110XV60C*	16.8	13.5	7.8	16,800	214624101
CRX35-48C-*-+TDR	ML180DF110E60C*	16.6	13.0	8.7	18,800	213258036
CK40DT-48C-0*+TDR	ML180DF110E60C*	16.6	13.0	8.7	18,800	214624011
CHX35-42C-*-+TDR	EL280UH110XE60C*	16.6	13.5	8.1	18,100	211001915
CHX35-42C-*-+TDR	ML180UH110V60C*	16.6	13.5	8.1	18,200	211001925
CHX35-42C-*-+TDR	EL280UH110E60C*	16.6	13.5	8.1	18,100	211001914
CHX35-42C-*-+TDR	SL280UH100NV60C*	16.6	13.5	8.1	18,400	211001939
CHX35-42C-*-+TDR	ML296UH110XV60C*	16.6	13.5	8.1	18,100	211001935
CHX35-42C-*-+TDR	SL280UH080NV60C*	16.6	13.5	8.1	18,000	211001936
CHX35-51/61C-*-+TDR	EL280UH110XE60C*	16.6	13.5	8.1	17,500	210049013
CHX35-51/61C-*-+TDR	SL280UH080NV60C*	16.6	13.5	8.1	17,700	210049076
CHX35-51/61C-*-+TDR	ML180UH110V60C*	16.6	13.5	8.1	17,700	210049042
CHX35-51/61C-*-+TDR	EL280UH110E60C*	16.6	13.5	8.1	17,500	210049009
CK40HT-42C-0*+TDR	EL280UH110E60C*	16.6	13.5	8.1	18,100	214623863
CK40HT-42C-0*+TDR	EL280UH110XE60C*	16.6	13.5	8.1	18,100	214623864
CK40HT-51/61C-0*+TDR	EL280UH110E60C*	16.6	13.5	8.1	17,500	214623939
CK40HT-51/61C-0*+TDR	EL280UH110XE60C*	16.6	13.5	8.1	17,500	214623940
CK40HT-51/61C-0*+TDR	ML180UH110V60C*	16.6	13.5	8.1	17,700	214623950
CK40HT-51/61C-0*+TDR	SL280UH080NV60C*	16.6	13.5	8.1	17,700	214623962
CK40HT-42C-0*+TDR	ML180UH110V60C*	16.6	13.5	8.1	18,200	214623874
CK40HT-42C-0*+TDR	ML296UH110XV60C*	16.6	13.5	8.1	18,100	214623885
CK40HT-42C-0*+TDR	SL280UH080NV60C*	16.6	13.5	8.1	18,000	214623886
CK40HT-42C-0*+TDR	SL280UH100NV60C*	16.6	13.5	8.1	18,400	214623889
CHX35-51/61C-*-+TDR	EL280UH110E48C*	16.6	13.5	8.0	17,100	210049005
CHX35-51/61C-*-+TDR	ML180UH090E60C*	16.6	13.5	8.0	17,400	210049036
CHX35-51/61C-*-+TDR	ML296UH110XV60C*	16.6	13.0	8.0	17,500	210049074
CHX35-42C-*-+TDR	EL196UH110XE60C*	16.6	13.5	8.0	17,800	211001912
CHX35-42C-*-+TDR	ML193UH110XE48C*	16.6	13.5	8.0	17,900	211001928
CHX35-42C-*-+TDR	ML196UH110XE60C*	16.6	13.5	8.0	17,800	211001933
C35-48C+TDR+TXV	ML180UH110E60C*	16.6	13.5	8.0	17,000	213804918
C35-48C+TDR+TXV	SL280UH090V60C*	16.6	13.5	8.0	17,100	213804931
C35-48C+TDR+TXV	SL280UH090XV60C*	16.6	13.5	8.0	17,000	213804932
C35-48C+TDR+TXV	SL280UH100NV60C*	16.6	13.5	8.0	17,100	213804933
CX35-48C+TDR	ML180UH110E60C*	16.6	13.5	8.0	17,000	213804959
CX35-48C+TDR	SL280UH090V60C*	16.6	13.5	8.0	17,100	213804972
CX35-48C+TDR	SL280UH090XV60C*	16.6	13.5	8.0	17,000	213804973
CX35-48C+TDR	SL280UH100NV60C*	16.6	13.5	8.0	17,100	213804974
CK40HT-42C-0*+TDR	EL196UH110XE60C*	16.6	13.5	8.0	17,800	214623861
CK40HT-51/61C-0*+TDR	EL280UH110E48C*	16.6	13.5	8.0	17,100	214623938
CK40HT-51/61C-0*+TDR	ML180UH090E60C*	16.6	13.5	8.0	17,400	214623948
CK40HT-51/61C-0*+TDR	ML296UH110XV60C*	16.6	13.0	8.0	17,500	214623961

Yearly running cost in 10 large cities$1,004-$2,488

Phoenix, AZ$1,210/yr
Miami, FL$1,004/yr
Houston, TX$1,084/yr
Atlanta, GA$1,060/yr
Los Angeles, CA$1,023/yr
New York, NY$2,488/yr
Chicago, IL$2,011/yr
Denver, CO$1,665/yr
Seattle, WA$1,018/yr
Minneapolis, MN$2,058/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 ML17XP1-036-230A?: The Lennox ML17XP1-036-230A is rated at up to 16.8 SEER2 and 13.5 EER2 for cooling and up to 8.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 757 certified matchups SEER2 ranges from 15.2-16.8.
Is the Lennox ML17XP1-036-230A 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 3-ton model.
How much does the Lennox ML17XP1-036-230A cost to run per year?: At its rated efficiency it costs about $1,004-$2,488 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,210 in Phoenix and $2,058 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 ML17XP1-036-230A?: ENERGY STAR lists 757 certified combinations for this outdoor unit. The highest-rated ones use CHX35-42C-**-*+TDR, C35-48C+TDR+TXV, CX35-48C+TDR.
What refrigerant does the Lennox ML17XP1-036-230A 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 $1,187/yrYou save $630/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 ML17XP1-036-230A

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: $1,187
Current system, per year: $1,817
You save per year: $630
Payback: 21.4 years
Net after 10 years: -$7,199

Cooling $754Heating $433Electricity used: 7,418 kWhSaved vs. a minimum-efficiency heat pump: $201

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 3 ton models

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Day & Night D5CURAH36AAK · cold climate16.7 SEER2 · 9.3 HSPF2
Concord 4HP17L36P-**A16.8 SEER2 · 8.7 HSPF2
DuraSTAR DRU1U36S2A · cold climate16.7 SEER2 · 9.3 HSPF2
Comfort-Aire HRG1536S1R-**A16.8 SEER2 · 8.7 HSPF2
Elios ESHEA36R2AN1 · cold climate16.7 SEER2 · 9.3 HSPF2
Blueridge BHP17L36P-**A16.8 SEER2 · 8.7 HSPF2

See all 302 3 ton central heat pumps, ranked

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