What is the SEER2 rating of the Lennox ML17XP1-048-230A?

The Lennox ML17XP1-048-230A is rated at up to 15.8 SEER2 and 13.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 303 certified matchups SEER2 ranges from 15.2-15.8.

Is the Lennox ML17XP1-048-230A 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 4-ton model.

How much does the Lennox ML17XP1-048-230A cost to run per year?

At its rated efficiency it costs about $1,412-$3,465 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,706 in Phoenix and $2,859 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 ML17XP1-048-230A?

ENERGY STAR lists 303 certified combinations for this outdoor unit. The highest-rated ones use CX35-60C+TDR, C35-60C+TDR+TXV, CK40CT-60C-0*+TDR.

What refrigerant does the Lennox ML17XP1-048-230A 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.

4-ton central heat pump · MERIT ML17XP1 Series

Lennox ML17XP1-048-230A

Below average cooling and heating efficiency for a 4-ton central heat pump, but not rated for cold climates.

Ranks #262 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,483 a year to run in a mixed climate like Atlanta.

SEER2: 15.8 Cooling efficiency over a season
Below average · beats 18%
HSPF2: 8.5 Heating efficiency over a season
Below average · beats 38%
EER2: 13.0 Cooling efficiency on a 95°F day
Very good · beats 89%
Heat at 5°F: 26,000 BTU/h54% of its 47°F output
Excellent · beats 94%

A good fit if…

You want a choice of indoor units - 303 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 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.

Calculate my running cost

Details

Specifications4 ton, R-410A

General
Brand	Lennox
Outdoor unit model	ML17XP1-048-230A
Series	MERIT ML17XP1 Series
Type	Central heat pump
Nominal size	4 ton
CompressorVariable-speed units run longer at low power	Single stage
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	October 1, 2022
Last certified	October 27, 2025
Cooling
SEER2Seasonal efficiency, higher is better	15.8 (range 15.2-15.8)
EER2Efficiency at 95°F outdoors	12.0-13.0
Cooling capacity	46,000-48,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.0-8.5
Capacity at 47°F	44,500-47,000 BTU/h
Capacity at 17°F	30,000-31,800 BTU/h
Capacity at 5°F	24,200-26,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.16-2.38
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 CX35-60C+TDR at the standard test temperatures, in BTU/h:

Certified matchups303 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 303 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.
CX35-60C+TDR	SL280UH080NV60C*	15.8	13.0	8.3	25,200	210051377
C35-60C+TDR+TXV	SL280UH080NV60C*	15.8	13.0	8.3	25,200	210051023
CK40CT-60C-0*+TDR	SL280UH080NV60C*	15.8	13.0	8.3	25,200	214624806
CHX35-51/61C-*-+TDR	SL280UH080NV60C*	15.6	12.5	8.3	25,400	210051186
C35-60C+TDR+TXV	EL280UH110XE60C*	15.6	13.0	8.3	25,200	210051004
CX35-60C+TDR	EL280UH110E48C*	15.6	13.0	8.3	25,200	210051356
CX35-60C+TDR	EL280UH110XE60C*	15.6	13.0	8.3	25,200	210051358
CHX35-51/61C-*-+TDR	ML180UH090E60C*	15.6	12.5	8.3	25,200	210051176
C35-60C+TDR+TXV	ML180UH110V60C*	15.6	13.0	8.3	25,400	210051014
CH35-51C+TDR+TXV	SL280UH080NV60C*	15.6	12.5	8.3	25,400	210051105
CX35-60C+TDR	SL280UH100NV60C*	15.6	13.0	8.3	25,400	210051380
CX35-60C+TDR	EL280UH110E60C*	15.6	13.0	8.3	25,200	210051357
C35-60C+TDR+TXV	SL280UH100NV60C*	15.6	13.0	8.3	25,400	210051026
C35-60C+TDR+TXV	EL280UH110E60C*	15.6	13.0	8.3	25,200	210051003
C35-60C+TDR+TXV	EL280UH110E48C*	15.6	13.0	8.3	25,200	210051002
CX35-60C+TDR	ML180UH110V60C*	15.6	13.0	8.3	25,400	210051368
CK40HT-51/61C-0*+TDR	ML180UH090E60C*	15.6	12.5	8.3	25,200	214624501
CK40HT-51/61C-0*+TDR	SL280UH080NV60C*	15.6	12.5	8.3	25,400	214624518
CK40CT-60C-0*+TDR	EL280UH110E48C*	15.6	13.0	8.3	25,200	214624771
CK40CT-60C-0*+TDR	EL280UH110E60C*	15.6	13.0	8.3	25,200	214624773
CK40CT-60C-0*+TDR	EL280UH110XE60C*	15.6	13.0	8.3	25,200	214624774
CK40CT-60C-0*+TDR	ML180UH110V60C*	15.6	13.0	8.3	25,400	214624790
CK40CT-60C-0*+TDR	SL280UH100NV60C*	15.6	13.0	8.3	25,400	214624810
CX35-48C+TDR	EL280UH110E60C*	15.6	12.5	8.1	24,200	210051249
C35-48C+TDR+TXV	EL280UH110XE60C*	15.6	12.5	8.1	24,200	210050898
CX35-48C+TDR	EL280UH110XE60C*	15.6	12.5	8.1	24,200	210051250
C35-48C+TDR+TXV	EL280UH110E60C*	15.6	12.5	8.1	24,200	210050897
C35-49C+TDR+TXV	ML180UH090E60C*	15.6	13.0	8.1	25,000	210050943
C35-49C+TDR+TXV	SL280UH080NV60C*	15.6	13.0	8.1	25,400	210050954
C35-60C+TDR+TXV	ML180UH090E60C*	15.6	13.0	8.1	25,200	210051012
CX35-49C+TDR	ML180UH090E60C*	15.6	13.0	8.1	25,000	210051295
CX35-60C+TDR	ML180UH090E60C*	15.6	13.0	8.1	25,200	210051366
CX35-49C+TDR	SL280UH080NV60C*	15.6	13.0	8.1	25,400	210051306
CK40CT-48C-0*+TDR	EL280UH110E60C*	15.6	12.5	8.1	24,200	214624599
CK40CT-48C-0*+TDR	EL280UH110XE60C*	15.6	12.5	8.1	24,200	214624601
CK40CT-49C-0*+TDR	ML180UH090E60C*	15.6	13.0	8.1	25,000	214624672
CK40CT-49C-0*+TDR	SL280UH080NV60C*	15.6	13.0	8.1	25,400	214624691
CK40CT-60C-0*+TDR	ML180UH090E60C*	15.6	13.0	8.1	25,200	214624787
CBA27UHE-048-230*+TDR	-	15.4	12.5	8.5	24,400	210051036
CBA27UHE-048-460*+TDR	-	15.4	12.5	8.5	24,400	213369569
CHX35-51/61C-*-+TDR	ML193UH110XE48C*	15.4	12.5	8.3	25,600	210051180
C35-60C+TDR+TXV	SL280UH090XV60C*	15.4	12.5	8.3	25,600	210051025
C35-60C+TDR+TXV	SL280UH110V60C*	15.4	12.5	8.3	25,400	210051027
CHX35-51/61C-*-+TDR	ML180UH110V60C*	15.4	12.5	8.3	25,600	210051178
CX35-60C+TDR	ML193UH110XE60C*	15.4	12.5	8.3	25,400	210051371
CHX35-51/61C-*-+TDR	EL280UH110E60C*	15.4	12.5	8.3	25,400	210051169
C35-60C+TDR+TXV	SL280UH110XV60C*	15.4	12.5	8.3	25,400	210051028
CHX35-51/61C-*-+TDR	EL280UH110E48C*	15.4	12.5	8.3	25,600	210051168
CHX35-51/61C-*-+TDR	EL280UH110XE60C*	15.4	12.5	8.3	25,400	210051170
CX35-60C+TDR	SL280UH090XV60C*	15.4	12.5	8.3	25,600	210051379
CHX35-51/61C-*-+TDR	SL280UH100NV60C*	15.4	12.5	8.3	25,600	210051189
C35-60C+TDR+TXV	ML180UH110E60C*	15.4	12.5	8.3	25,400	210051013
C35-60C+TDR+TXV	ML296UH110XV60C*	15.4	12.5	8.3	25,600	210051022
CX35-60C+TDR	SL280UH110V60C*	15.4	12.5	8.3	25,400	210051381
CX35-60C+TDR	SL280UH110XV60C*	15.4	12.5	8.3	25,400	210051382
C35-60C+TDR+TXV	ML193UH110XE60C*	15.4	12.5	8.3	25,400	210051017
CX35-60C+TDR	ML296UH110XV60C*	15.4	12.5	8.3	25,600	210051376
CHX35-51/61C-*-+TDR	ML196UH110XE60C*	15.4	12.5	8.3	25,400	210051183
CX35-60C+TDR	SL280UH090V60C*	15.4	12.5	8.3	25,600	210051378
CHX35-51/61C-*-+TDR	EL196UH110XE60C*	15.4	12.5	8.3	25,400	210051167

Yearly running cost in 10 large cities$1,412-$3,465

Phoenix, AZ$1,706/yr
Miami, FL$1,422/yr
Houston, TX$1,528/yr
Atlanta, GA$1,483/yr
Los Angeles, CA$1,428/yr
New York, NY$3,465/yr
Chicago, IL$2,798/yr
Denver, CO$2,314/yr
Seattle, WA$1,412/yr
Minneapolis, MN$2,859/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 ML17XP1-048-230A?: The Lennox ML17XP1-048-230A is rated at up to 15.8 SEER2 and 13.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 303 certified matchups SEER2 ranges from 15.2-15.8.
Is the Lennox ML17XP1-048-230A 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 4-ton model.
How much does the Lennox ML17XP1-048-230A cost to run per year?: At its rated efficiency it costs about $1,412-$3,465 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,706 in Phoenix and $2,859 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 ML17XP1-048-230A?: ENERGY STAR lists 303 certified combinations for this outdoor unit. The highest-rated ones use CX35-60C+TDR, C35-60C+TDR+TXV, CK40CT-60C-0*+TDR.
What refrigerant does the Lennox ML17XP1-048-230A 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 $1,669/yrYou save $765/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 ML17XP1-048-230A

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: $1,669
Current system, per year: $2,434
You save per year: $765
Payback: 23.5 years
Net after 10 years: -$10,348

Cooling $1,069Heating $600Electricity used: 10,431 kWhSaved vs. a minimum-efficiency heat pump: $192

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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See all 319 4 ton central heat pumps, ranked

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