What is the SEER2 rating of the Lennox MPC012S4S-1P?

The Lennox MPC012S4S-1P is rated at up to 24.6 SEER2 and 13.7 EER2 for cooling and up to 10.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 12 certified matchups SEER2 ranges from 18.8-24.6.

Is the Lennox MPC012S4S-1P good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 8,400 BTU/h at 5°F with a COP of 2.39, so it is still 2.4 times as efficient as electric resistance heat at that temperature.

How much does the Lennox MPC012S4S-1P cost to run per year?

At its rated efficiency it costs about $230-$690 a year in electricity in large U.S. cities, depending on climate and local rates - for example $294 in Phoenix and $584 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 MPC012S4S-1P?

ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use LENNOX MWMC012S4-1P, LENNOX MWMC012S4, LENNOX MWMC012S4-*P.

What refrigerant does the Lennox MPC012S4S-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.

12,000 BTU mini-split heat pump · M series

Lennox MPC012S4S-1P

Very good cooling efficiency and average heating efficiency for a 12,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #144 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $281 a year to run in a mixed climate like Atlanta.

SEER2: 24.6 Cooling efficiency over a season
Very good · beats 80%
HSPF2: 10.7 Heating efficiency over a season
Average · beats 68%
EER2: 13.7 Cooling efficiency on a 95°F day
Very good · beats 78%
Heat at 5°F: 8,400 BTU/h67% of its 47°F output
Excellent · beats 91%

A good fit if…

You want low cooling bills - its SEER2 beats 80% of mini-splits.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 8,400 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.
You want a choice of indoor units - 12 certified pairings.

Think twice if…

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

Calculate my running cost

Details

Specifications12,000 BTU, R-410A

General
Brand	Lennox
Outdoor unit model	MPC012S4S-1P
Series	M series
Type	Mini-split heat pump
Nominal size	12,000 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	June 13, 2026
Cooling
SEER2Seasonal efficiency, higher is better	24.6 (range 18.8-24.6)
EER2Efficiency at 95°F outdoors	11.7-13.9
Cooling capacity	11,500-12,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.9-10.7
Capacity at 47°F	12,000 BTU/h
Capacity at 17°F	8,900-9,300 BTU/h
Capacity at 5°F	8,000-8,400 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.26-2.39
ENERGY STAR cold climate	Yes

Heating output as it gets colder67% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MWMC012S4-1P 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.
MWMC012S4-1P LENNOX	24.6	13.7	10.7	8,000	207683498
MWMC012S4 LENNOX	24.6	13.7	10.7	8,000	210665604
MWMC012S4-*P LENNOX	24.6	13.7	10.7	8,000	211034417
MFMA012S4-1P LENNOX · cold climate	22.7	13.0	10.2	8,400	207683509
MFMA012S4-*P LENNOX · cold climate	22.7	13.0	10.2	8,400	211034429
MFMA012S4 LENNOX · cold climate	22.7	13.0	10.2	8,400	210665616
M22A012S4-2P LENNOX	22.7	13.9	9.9	8,000	207683515
M22A012S4-*P LENNOX	22.7	13.9	9.9	8,000	211034435
M22A012S4 LENNOX	22.7	13.9	9.9	8,000	210665622
MMDB012S4-2P LENNOX · cold climate	18.8	11.7	10.3	8,400	207683504
MMDB012S4-*P LENNOX · cold climate	18.8	11.7	10.3	8,400	211034424
MMDB012S4 LENNOX · cold climate	18.8	11.7	10.3	8,400	210665611

Yearly running cost in 10 large cities$230-$690

Phoenix, AZ$294/yr
Miami, FL$230/yr
Houston, TX$264/yr
Atlanta, GA$281/yr
Los Angeles, CA$277/yr
New York, NY$690/yr
Chicago, IL$564/yr
Denver, CO$471/yr
Seattle, WA$292/yr
Minneapolis, MN$584/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 MPC012S4S-1P?: The Lennox MPC012S4S-1P is rated at up to 24.6 SEER2 and 13.7 EER2 for cooling and up to 10.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 12 certified matchups SEER2 ranges from 18.8-24.6.
Is the Lennox MPC012S4S-1P good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 8,400 BTU/h at 5°F with a COP of 2.39, so it is still 2.4 times as efficient as electric resistance heat at that temperature.
How much does the Lennox MPC012S4S-1P cost to run per year?: At its rated efficiency it costs about $230-$690 a year in electricity in large U.S. cities, depending on climate and local rates - for example $294 in Phoenix and $584 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 MPC012S4S-1P?: ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use LENNOX MWMC012S4-1P, LENNOX MWMC012S4, LENNOX MWMC012S4-*P.
What refrigerant does the Lennox MPC012S4S-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 $297/yrYou save $321/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 MPC012S4S-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: $297
Current system, per year: $619
You save per year: $321
Payback: 14.0 years
Net after 10 years: -$1,286

Cooling $172Heating $126Electricity used: 1,858 kWhSaved vs. a minimum-efficiency heat pump: $177

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 12,000 BTU models

Kaden KO-PSX12HP-2AAMA24.6 SEER2 · 10.7 HSPF2
MDV MOX230-12HFN1-MV5W-L · cold climate24.6 SEER2 · 10.7 HSPF2
DIRECT AIR DIRM-12DA25-1Z · cold climate24.6 SEER2 · 10.7 HSPF2
MRCOOL O-ES-12-HP-C-230B24.6 SEER2 · 10.7 HSPF2
Concord 4DHP2S12S-1P · cold climate24.6 SEER2 · 10.7 HSPF2
Blueridge BXS4Z12UC0 · cold climate24.5 SEER2 · 9.5 HSPF2
Bosch BMS500-AAS012-1CSXRC · cold climate24.6 SEER2 · 10.7 HSPF2
GREE ENV12HP230V1R32AO · cold climate24.5 SEER2 · 9.5 HSPF2

See all 394 12,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 13, 2026. How we use the data.