What is the SEER2 rating of the Multi MFG HHS-36HD-A?

The Multi MFG HHS-36HD-A is rated at up to 17.6 SEER2 and 10.2 EER2 for cooling and up to 9.9 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 16.0-17.6.

Is the Multi MFG HHS-36HD-A good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 36,000 BTU/h at 5°F with a COP of 1.97, so it is still 2.0 times as efficient as electric resistance heat at that temperature.

How much does the Multi MFG HHS-36HD-A cost to run per year?

At its rated efficiency it costs about $959-$2,452 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,167 in Phoenix and $2,037 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 Multi MFG HHS-36HD-A?

ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use 36MUC0-HH-A, 36HSHP-C-M-A, 36MPHP0-M-A.

What refrigerant does the Multi MFG HHS-36HD-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-ton central heat pump · HHS Series

Multi MFG HHS-36HD-A

Average cooling efficiency and very good heating efficiency for a 3-ton central heat pump, and certified for cold climates.

Ranks #127 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,037 a year to run in a mixed climate like Atlanta.

SEER2: 17.6 Cooling efficiency over a season
Average · beats 62%
HSPF2: 9.9 Heating efficiency over a season
Very good · beats 80%
EER2: 10.2 Cooling efficiency on a 95°F day
Below average · beats 15%
Heat at 5°F: 36,000 BTU/h88% of its 47°F output
Below average · beats 30%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 36,000 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 80% of central heat pumps.
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

Specifications3 ton, R-410A

General
Brand	Multi MFG
Outdoor unit model	HHS-36HD-A
Series	HHS Series
Type	Central heat pump
Nominal size	3 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	February 20, 2025
Last certified	June 9, 2026
Cooling
SEER2Seasonal efficiency, higher is better	17.6 (range 16.0-17.6)
EER2Efficiency at 95°F outdoors	10.0-10.2
Cooling capacity	36,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.2-9.9
Capacity at 47°F	36,000-40,000 BTU/h
Capacity at 17°F	28,600-32,800 BTU/h
Capacity at 5°F	33,400-36,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.81-1.97
ENERGY STAR cold climate	Yes

Heating output as it gets colder88% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 36MUC0-HH-A at the standard test temperatures, in BTU/h:

Certified matchups3 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.
36MUC0-HH-A · cold climate	17.6	10.2	9.2	33,400	212924809
36HSHP-C-M-A · cold climate	17.0	10.0	9.9	36,000	213386555
36MPHP0-M-A · cold climate	16.0	10.0	9.5	34,400	212920481

Yearly running cost in 10 large cities$959-$2,452

Phoenix, AZ$1,167/yr
Miami, FL$959/yr
Houston, TX$1,045/yr
Atlanta, GA$1,037/yr
Los Angeles, CA$1,004/yr
New York, NY$2,452/yr
Chicago, IL$1,986/yr
Denver, CO$1,647/yr
Seattle, WA$1,009/yr
Minneapolis, MN$2,037/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 Multi MFG HHS-36HD-A?: The Multi MFG HHS-36HD-A is rated at up to 17.6 SEER2 and 10.2 EER2 for cooling and up to 9.9 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 16.0-17.6.
Is the Multi MFG HHS-36HD-A good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 36,000 BTU/h at 5°F with a COP of 1.97, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
How much does the Multi MFG HHS-36HD-A cost to run per year?: At its rated efficiency it costs about $959-$2,452 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,167 in Phoenix and $2,037 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 Multi MFG HHS-36HD-A?: ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use 36MUC0-HH-A, 36HSHP-C-M-A, 36MPHP0-M-A.
What refrigerant does the Multi MFG HHS-36HD-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 $1,150/yrYou save $739/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 Multi MFG HHS-36HD-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: $1,150
Current system, per year: $1,889
You save per year: $739
Payback: 18.3 years
Net after 10 years: -$6,109

Cooling $720Heating $430Electricity used: 7,187 kWhSaved vs. a minimum-efficiency heat pump: $304

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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Innovair SHV36H2R20 · cold climate17.6 SEER2 · 10.0 HSPF2
Lennox ML16KP2-036-230A17.5 SEER2 · 8.5 HSPF2
DIYCOOL ACIQ-36-HPB · cold climate17.6 SEER2 · 10.0 HSPF2
Samsung AC036FCUPCG · cold climate17.5 SEER2 · 8.5 HSPF2
Breeze33 BZ33-INV36OUT2-J · cold climate17.6 SEER2 · 10.0 HSPF2
Capella CCB1-H36A-O · cold climate17.4 SEER2 · 10.3 HSPF2

See all 302 3 ton central heat pumps, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 9, 2026. How we use the data.