What is the SEER2 rating of the MRCOOL MHP17L42P-**A?

The MRCOOL MHP17L42P-**A is rated at up to 15.6 SEER2 and 13.0 EER2 for cooling and up to 8.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 15.2-15.6.

Is the MRCOOL MHP17L42P-**A 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 3.5-ton model.

How much does the MRCOOL MHP17L42P-**A cost to run per year?

At its rated efficiency it costs about $1,234-$3,217 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,510 in Phoenix and $2,679 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 MRCOOL MHP17L42P-**A?

ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated one uses MCDP0048CNPB+TDR.

What refrigerant does the MRCOOL MHP17L42P-**A 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.

3.5-ton central heat pump · MHP17L Series

MRCOOL MHP17L42P-**A

Below average cooling and heating efficiency for a 3.5-ton central heat pump, but not rated for cold climates.

Ranks #95 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,354 a year to run in a mixed climate like Atlanta.

SEER2: 15.6 Cooling efficiency over a season
Below average · beats 17%
HSPF2: 8.3 Heating efficiency over a season
Below average · beats 30%
EER2: 13.0 Cooling efficiency on a 95°F day
Very good · beats 89%
Heat at 5°F: 22,000 BTU/h52% of its 47°F output
Average · beats 65%

A good fit if…

You want a certified 3.5-ton central heat pump at a typical efficiency level.

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

Specifications3.5 ton, R-410A

General
Brand	MRCOOL
Outdoor unit model	MHP17L42P-**A
Series	MHP17L Series
Type	Central heat pump
Nominal size	3.5 ton
CompressorVariable-speed units run longer at low power	Single stage
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	August 25, 2023
Last certified	October 27, 2025
Cooling
SEER2Seasonal efficiency, higher is better	15.6 (range 15.2-15.6)
EER2Efficiency at 95°F outdoors	13.0
Cooling capacity	40,000-41,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.2-8.3
Capacity at 47°F	41,500-42,000 BTU/h
Capacity at 17°F	27,600 BTU/h
Capacity at 5°F	21,800-22,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.12
ENERGY STAR cold climate	No

Heating output as it gets colder52% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MCDP0048CNPB+TDR at the standard test temperatures, in BTU/h:

Certified matchups2 indoor units

The same outdoor unit scores differently with each indoor unit and furnace. 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.
MCDP0048CNPB+TDR	MGD80SE110C5A	15.6	13.0	8.3	21,800	213265550
MCDP0048CNPB+TDR	MGD96SE110C5XA	15.2	13.0	8.2	22,000	213265551

Yearly running cost in 10 large cities$1,234-$3,217

Phoenix, AZ$1,510/yr
Miami, FL$1,234/yr
Houston, TX$1,353/yr
Atlanta, GA$1,354/yr
Los Angeles, CA$1,314/yr
New York, NY$3,217/yr
Chicago, IL$2,608/yr
Denver, CO$2,165/yr
Seattle, WA$1,328/yr
Minneapolis, MN$2,679/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 MRCOOL MHP17L42P-**A?: The MRCOOL MHP17L42P-**A is rated at up to 15.6 SEER2 and 13.0 EER2 for cooling and up to 8.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 15.2-15.6.
Is the MRCOOL MHP17L42P-**A 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 3.5-ton model.
How much does the MRCOOL MHP17L42P-**A cost to run per year?: At its rated efficiency it costs about $1,234-$3,217 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,510 in Phoenix and $2,679 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 MRCOOL MHP17L42P-**A?: ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated one uses MCDP0048CNPB+TDR.
What refrigerant does the MRCOOL MHP17L42P-**A 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 $1,492/yrYou save $639/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 MRCOOL MHP17L42P-**A

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: $1,492
Current system, per year: $2,130
You save per year: $639
Payback: 24.3 years
Net after 10 years: -$9,115

Cooling $925Heating $567Electricity used: 9,324 kWhSaved vs. a minimum-efficiency heat pump: $145

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 3.5 ton models

Lennox ML17XP1-042-230A15.6 SEER2 · 8.3 HSPF2
Hisense AUWR-48U3SP · cold climate15.6 SEER2 · 8.6 HSPF2
Lennox EL17XP1-042-230A15.6 SEER2 · 8.3 HSPF2
AIREASE A7HP14F42P-**A15.5 SEER2 · 8.2 HSPF2
GE NS17H42SA4-**A15.6 SEER2 · 8.3 HSPF2
Concord 7HP14F42P-**A15.5 SEER2 · 8.2 HSPF2
Ducane 4HP17L42P-**A15.6 SEER2 · 8.3 HSPF2
GE NS16H42SA5-**A15.5 SEER2 · 8.2 HSPF2

See all 138 3.5 ton central heat pumps, ranked

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