What is the SEER2 rating of the TOSOT TM24D6MO?

The TOSOT TM24D6MO is rated at up to 21.0 SEER2 and 13.3 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 18.0-21.0.

Is the TOSOT TM24D6MO good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 21,600 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.

How much does the TOSOT TM24D6MO cost to run per year?

At its rated efficiency it costs about $538-$1,501 a year in electricity in large U.S. cities, depending on climate and local rates - for example $672 in Phoenix and $1,260 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the TOSOT TM24D6MO the same as the TOSOT TM24H32MO?

Yes, as far as the certified ratings go. ENERGY STAR lists 20 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.

24,000 BTU mini-split heat pump · TOSOT Comfort Manhatthan Series

TOSOT TM24D6MO

Below average cooling efficiency and average heating efficiency for a 24,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #289 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $622 a year to run in a mixed climate like Atlanta.

SEER2: 21.0 Cooling efficiency over a season
Below average · beats 30%
HSPF2: 10.0 Heating efficiency over a season
Average · beats 43%
EER2: 13.3 Cooling efficiency on a 95°F day
Very good · beats 70%
Heat at 5°F: 21,600 BTU/h90% of its 47°F output
Average · beats 48%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 21,600 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

Cooling cost matters most - its SEER2 is below average for mini-splits.

Calculate my running cost

Details

Specifications24,000 BTU, R-32

General
Brand	TOSOT
Also sold as	Blueridge, GREE, AC Pro, Kinghome, BOREAL, Willis, TGM, Ouellet, CLASSIC, AIR MAX
Outdoor unit model	TM24D6MO
Series	TOSOT Comfort Manhatthan Series
Type	Mini-split heat pump
Nominal size	24,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-32
Connected (smart) capable	No
On the market since	July 4, 2024
Last certified	September 22, 2026
Cooling
SEER2Seasonal efficiency, higher is better	21.0 (range 18.0-21.0)
EER2Efficiency at 95°F outdoors	12.0-13.3
Cooling capacity	24,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.1-10.0
Capacity at 47°F	24,000 BTU/h
Capacity at 17°F	22,000-23,600 BTU/h
Capacity at 5°F	21,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80-2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder90% 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 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.
- · cold climate	21.0	13.3	10.0	21,600	216571390
- · cold climate	19.0	12.2	9.0	21,600	216571400
- · cold climate	18.0	12.0	8.1	21,600	216571396

Same unit, other model numbers19

These model numbers have exactly the same certified ratings and matchups as the TOSOT TM24D6MO: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

TOSOT TM24H32MO
TOSOT TM24R32MO
TOSOT TM24WH21MO
TOSOT TMH24D32MO
TOSOT TMSCI7H4R24
TOSOT GWHD21-24H2D
TOSOT MZ-COSMO24/O
Blueridge BXM2Z24UC0
GREE GWHD(24)ND6MO
GREE GS3M24HP230V1MO
GREE MUL24HP230V1R32AO
AC Pro MHPC-D-024BMC
Kinghome KM24X6O
BOREAL MUL24HPJ132OA
Willis MZUHW24KR32-O
TGM GMRSHT24AS3
Ouellet OFRM3X1-H24A-O
CLASSIC GMRSHC24AS3
AIR MAX AFMKH24-H2

Yearly running cost in 10 large cities$538-$1,501

Phoenix, AZ$672/yr
Miami, FL$538/yr
Houston, TX$603/yr
Atlanta, GA$622/yr
Los Angeles, CA$608/yr
New York, NY$1,501/yr
Chicago, IL$1,221/yr
Denver, CO$1,018/yr
Seattle, WA$627/yr
Minneapolis, MN$1,260/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 TOSOT TM24D6MO?: The TOSOT TM24D6MO is rated at up to 21.0 SEER2 and 13.3 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 18.0-21.0.
Is the TOSOT TM24D6MO good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 21,600 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
How much does the TOSOT TM24D6MO cost to run per year?: At its rated efficiency it costs about $538-$1,501 a year in electricity in large U.S. cities, depending on climate and local rates - for example $672 in Phoenix and $1,260 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the TOSOT TM24D6MO the same as the TOSOT TM24H32MO?: Yes, as far as the certified ratings go. ENERGY STAR lists 20 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 TOSOT TM24D6MO use?: It uses 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 $671/yrYou save $566/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 TOSOT TM24D6MO

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: $671
Current system, per year: $1,238
You save per year: $566
Payback: 15.9 years
Net after 10 years: -$3,336

Cooling $402Heating $269Electricity used: 4,194 kWhSaved vs. a minimum-efficiency heat pump: $278

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 24,000 BTU models

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Innovair WIN24H7H51(O) · cold climate21.0 SEER2 · 10.0 HSPF2
York YRAMX24N3HBA · cold climate21.0 SEER2 · 10.0 HSPF2
Gibson GXH24(7.0)FMK4DH-1 · cold climate21.0 SEER2 · 10.0 HSPF2
LG KUMXA241A · cold climate21.0 SEER2 · 9.8 HSPF2
GE Appliances ASH124UCDD · cold climate21.0 SEER2 · 10.0 HSPF2
Deye DWB3-ACDC-24K · cold climate21.0 SEER2 · 9.6 HSPF2

See all 430 24,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 22, 2026. How we use the data.