What is the SEER2 rating of the Lennox MPC009S4S-1P?

The Lennox MPC009S4S-1P is rated at up to 26.5 SEER2 and 15.8 EER2 for cooling and up to 13.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 12 certified matchups SEER2 ranges from 19.2-26.5.

Is the Lennox MPC009S4S-1P good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 8,000 BTU/h at 5°F with a COP of 2.17, so it is still 2.2 times as efficient as electric resistance heat at that temperature.

How much does the Lennox MPC009S4S-1P cost to run per year?

At its rated efficiency it costs about $160-$457 a year in electricity in large U.S. cities, depending on climate and local rates - for example $201 in Phoenix and $385 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 MPC009S4S-1P?

ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use LENNOX MWMC006S4-*P, LENNOX MWMC006S4-2P, LENNOX MWMC009S4-1P.

What refrigerant does the Lennox MPC009S4S-1P 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.

9,000 BTU mini-split heat pump · M series

Lennox MPC009S4S-1P

Excellent cooling and heating efficiency for a 9,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #96 of 395 9,000 BTU mini-splits for cooling efficiency, and costs about $188 a year to run in a mixed climate like Atlanta.

SEER2: 26.5 Cooling efficiency over a season
Excellent · beats 93%
HSPF2: 13.6 Heating efficiency over a season
Excellent · beats 97%
EER2: 15.8 Cooling efficiency on a 95°F day
Excellent · beats 95%
Heat at 5°F: 8,000 BTU/h107% of its 47°F output
Very good · beats 75%

A good fit if…

You want low cooling bills - its SEER2 beats 93% of mini-splits.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 8,000 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 97% of mini-splits.
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

Specifications9,000 BTU, R-410A

General
Brand	Lennox
Outdoor unit model	MPC009S4S-1P
Series	M series
Type	Mini-split heat pump
Nominal size	9,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	December 18, 2019
Last certified	May 6, 2026
Cooling
SEER2Seasonal efficiency, higher is better	26.5 (range 19.2-26.5)
EER2Efficiency at 95°F outdoors	12.5-15.8
Cooling capacity	6,000-9,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0-13.6
Capacity at 47°F	7,000-10,000 BTU/h
Capacity at 17°F	7,500-8,500 BTU/h
Capacity at 5°F	7,400-8,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.90-2.17
ENERGY STAR cold climate	Yes

Heating output as it gets colder107% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MWMC006S4-*P at the standard test temperatures, in BTU/h:

Certified matchups12 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.
MWMC006S4-*P LENNOX · cold climate	26.5	15.8	13.6	7,500	213257710
MWMC006S4-2P LENNOX · cold climate	26.5	15.8	13.6	7,500	213199199
MWMC009S4-1P LENNOX · cold climate	25.5	15.0	12.3	7,500	207683497
MWMC009S4-1P LENNOX · cold climate	25.5	15.0	12.3	7,500	207683497
MWMC009S4 LENNOX · cold climate	25.5	15.0	11.9	7,500	210665603
MWMC009S4-*P LENNOX · cold climate	25.5	15.0	11.9	7,500	211034416
M22A009S4-2P LENNOX · cold climate	20.0	13.0	10.0	7,400	207683514
M22A009S4-*P LENNOX · cold climate	20.0	13.0	10.0	7,400	211034434
M22A009S4 LENNOX · cold climate	20.0	13.0	10.0	7,400	210665621
MMDB009S4-2P LENNOX · cold climate	19.2	12.5	10.2	8,000	207683503
MMDB009S4-*P LENNOX · cold climate	19.2	12.5	10.0	8,000	211034423
MMDB009S4 LENNOX · cold climate	19.2	12.5	10.0	8,000	210665610

Yearly running cost in 10 large cities$160-$457

Phoenix, AZ$201/yr
Miami, FL$160/yr
Houston, TX$181/yr
Atlanta, GA$188/yr
Los Angeles, CA$185/yr
New York, NY$457/yr
Chicago, IL$373/yr
Denver, CO$311/yr
Seattle, WA$192/yr
Minneapolis, MN$385/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 MPC009S4S-1P?: The Lennox MPC009S4S-1P is rated at up to 26.5 SEER2 and 15.8 EER2 for cooling and up to 13.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 12 certified matchups SEER2 ranges from 19.2-26.5.
Is the Lennox MPC009S4S-1P good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 8,000 BTU/h at 5°F with a COP of 2.17, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
How much does the Lennox MPC009S4S-1P cost to run per year?: At its rated efficiency it costs about $160-$457 a year in electricity in large U.S. cities, depending on climate and local rates - for example $201 in Phoenix and $385 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 MPC009S4S-1P?: ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use LENNOX MWMC006S4-*P, LENNOX MWMC006S4-2P, LENNOX MWMC009S4-1P.
What refrigerant does the Lennox MPC009S4S-1P 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 $202/yrYou save $279/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 MPC009S4S-1P

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: $202
Current system, per year: $480
You save per year: $279
Payback: 12.6 years
Net after 10 years: -$715

Cooling $120Heating $82Electricity used: 1,262 kWhSaved vs. a minimum-efficiency heat pump: $169

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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Concord 4DHPS209S-1P · cold climate26.5 SEER2 · 13.6 HSPF2
NOVAIR LEA09SZ25SK-O · cold climate26.5 SEER2 · 13.6 HSPF2
Bosch BMS500-AAS009-1CSXRC · cold climate26.5 SEER2 · 13.6 HSPF2
Fujitsu AOUH09LMAS1 · cold climate26.5 SEER2 · 12.6 HSPF2
TOSOT TW09HXP2A1AO · cold climate27.0 SEER2 · 10.0 HSPF2
Fujitsu AOUH09LMAH1 · cold climate26.5 SEER2 · 12.3 HSPF2

See all 395 9,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 6, 2026. How we use the data.