What is the SEER2 rating of the MRCOOL MDPH180604?

The MRCOOL MDPH180604 is rated at up to 17.0 SEER2 and 10.6 EER2 for cooling and up to 8.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the MRCOOL MDPH180604 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 45,000 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.

How much does the MRCOOL MDPH180604 cost to run per year?

At its rated efficiency it costs about $1,550-$4,300 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,933 in Phoenix and $3,609 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the MRCOOL MDPH180604 the same as the AC Pro AK-H05TC/NAA-T(U)?

Yes, as far as the certified ratings go. ENERGY STAR lists 4 model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.

What refrigerant does the MRCOOL MDPH180604 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.

5-ton packaged heat pump · Universal Series Inverter Packaged Heat Pump

MRCOOL MDPH180604

Very good cooling efficiency and average heating efficiency for a 5-ton packaged heat pump, and certified for cold climates.

Ranks #10 of 29 5 ton packaged heat pumps for cooling efficiency, and costs about $1,784 a year to run in a mixed climate like Atlanta.

SEER2: 17.0 Cooling efficiency over a season
Very good · beats 76%
HSPF2: 8.3 Heating efficiency over a season
Average · beats 67%
EER2: 10.6 Cooling efficiency on a 95°F day
Below average · beats 10%
Heat at 5°F: 45,000 BTU/h79% of its 47°F output
Below average · beats 33%

A good fit if…

You want low cooling bills - its SEER2 beats 76% of packaged heat pumps.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 45,000 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications5 ton, R-410A

General
Brand	MRCOOL
Also sold as	AC Pro, Wells, Willis
Outdoor unit model	MDPH180604
Series	Universal Series Inverter Packaged Heat Pump
Type	Packaged heat pump
Nominal size	5 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	February 22, 2024
Last certified	June 29, 2026
Cooling
SEER2Seasonal efficiency, higher is better	17.0 (range 17.0)
EER2Efficiency at 95°F outdoors	10.6
Cooling capacity	56,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.3
Capacity at 47°F	57,000 BTU/h
Capacity at 17°F	37,000 BTU/h
Capacity at 5°F	45,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80
ENERGY STAR cold climate	Yes

Heating output as it gets colder79% kept at 5°F

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

Certified matchups1 indoor units

The same outdoor unit scores differently with each indoor unit. Ask your installer for the AHRI reference number of the exact system you are quoted.

Indoor unit	SEER2	EER2	HSPF2	Heat @5°F	AHRI ref.
- · cold climate	17.0	10.6	8.3	45,000	214097891

Same unit, other model numbers3

These model numbers have exactly the same certified ratings and matchups as the MRCOOL MDPH180604: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

AC Pro AK-H05TC/NAA-T(U)
Wells WRPA-60HDM/TC
Willis PRT60KUH

Yearly running cost in 10 large cities$1,550-$4,300

Phoenix, AZ$1,933/yr
Miami, FL$1,550/yr
Houston, TX$1,733/yr
Atlanta, GA$1,784/yr
Los Angeles, CA$1,742/yr
New York, NY$4,300/yr
Chicago, IL$3,498/yr
Denver, CO$2,914/yr
Seattle, WA$1,795/yr
Minneapolis, MN$3,609/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 MDPH180604?: The MRCOOL MDPH180604 is rated at up to 17.0 SEER2 and 10.6 EER2 for cooling and up to 8.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the MRCOOL MDPH180604 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 45,000 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
How much does the MRCOOL MDPH180604 cost to run per year?: At its rated efficiency it costs about $1,550-$4,300 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,933 in Phoenix and $3,609 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the MRCOOL MDPH180604 the same as the AC Pro AK-H05TC/NAA-T(U)?: Yes, as far as the certified ratings go. ENERGY STAR lists 4 model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
What refrigerant does the MRCOOL MDPH180604 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 $1,929/yrYou save $975/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 MDPH180604

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: $1,929
Current system, per year: $2,904
You save per year: $975
Payback: 21.5 years
Net after 10 years: -$11,248

Cooling $1,160Heating $769Electricity used: 12,054 kWhSaved vs. a minimum-efficiency heat pump: $301

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 29 5 ton packaged heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 29, 2026. How we use the data.