What is the SEER2 rating of the TCL TMH55HEI2NAS0U25?

The TCL TMH55HEI2NAS0U25 is rated at up to 22.5 SEER2 and 10.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 4 certified matchups SEER2 ranges from 18.5-22.5.

Is the TCL TMH55HEI2NAS0U25 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 42,000 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 TCL TMH55HEI2NAS0U25 cost to run per year?

At its rated efficiency it costs about $1,156-$3,545 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,488 in Phoenix and $3,010 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

60,000 BTU mini-split heat pump · free match 27S

TCL TMH55HEI2NAS0U25

Average cooling efficiency and below average heating efficiency for a 60,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #8 of 44 60,000 BTU mini-splits for cooling efficiency, and costs about $1,439 a year to run in a mixed climate like Atlanta.

SEER2: 22.5 Cooling efficiency over a season
Average · beats 56%
HSPF2: 9.5 Heating efficiency over a season
Below average · beats 24%
EER2: 10.0 Cooling efficiency on a 95°F day
Below average · beats 5%
Heat at 5°F: 42,000 BTU/h76% 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 42,000 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You mainly need heat - its HSPF2 is below average for mini-splits.

Calculate my running cost

Details

Specifications60,000 BTU, R-454B

General
Brand	TCL
Outdoor unit model	TMH55HEI2NAS0U25
Series	free match 27S
Type	Mini-split heat pump
Nominal size	60,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	December 3, 2025
Last certified	August 20, 2026
Cooling
SEER2Seasonal efficiency, higher is better	22.5 (range 18.5-22.5)
EER2Efficiency at 95°F outdoors	9.5-10.0
Cooling capacity	55,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.0-9.5
Capacity at 47°F	55,000 BTU/h
Capacity at 17°F	48,500-51,000 BTU/h
Capacity at 5°F	41,000-42,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.75-2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder76% 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 matchups4 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	22.5	10.0	9.5	42,000	218028417
- · cold climate	22.5	10.0	9.5	42,000	218625045
- · cold climate	20.5	9.8	9.3	41,500	218625174
- · cold climate	18.5	9.5	9.0	41,000	218625049

Yearly running cost in 10 large cities$1,156-$3,545

Phoenix, AZ$1,488/yr
Miami, FL$1,156/yr
Houston, TX$1,336/yr
Atlanta, GA$1,439/yr
Los Angeles, CA$1,419/yr
New York, NY$3,545/yr
Chicago, IL$2,899/yr
Denver, CO$2,426/yr
Seattle, WA$1,504/yr
Minneapolis, MN$3,010/yr

At each state's average electricity price and the city's typical heating and cooling hours.

Questions4

What is the SEER2 rating of the TCL TMH55HEI2NAS0U25?: The TCL TMH55HEI2NAS0U25 is rated at up to 22.5 SEER2 and 10.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 4 certified matchups SEER2 ranges from 18.5-22.5.
Is the TCL TMH55HEI2NAS0U25 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 42,000 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 TCL TMH55HEI2NAS0U25 cost to run per year?: At its rated efficiency it costs about $1,156-$3,545 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,488 in Phoenix and $3,010 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
What refrigerant does the TCL TMH55HEI2NAS0U25 use?: It uses R-454B.

Running cost and savings

Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

Heat pump $1,509/yrYou save $1,327/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 TCL TMH55HEI2NAS0U25

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: $1,509
Current system, per year: $2,836
You save per year: $1,327
Payback: 15.4 years
Net after 10 years: -$7,229

Cooling $860Heating $648Electricity used: 9,430 kWhSaved vs. a minimum-efficiency heat pump: $666

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 60,000 BTU models

TOSOT TMV-V60WL/NHC-T(U) · cold climate22.5 SEER2 · 9.2 HSPF2
Pioneer YN060GLSI24M6G · cold climate22.5 SEER2 · 9.5 HSPF2
Fujitsu AOUK060MSAN7 · cold climate22.2 SEER2 · 9.5 HSPF2
KANIONco KWSMO-55IR454BHS22.5R · cold climate22.5 SEER2 · 9.5 HSPF2
Comfort-Aire A-VMH55PV-1 · cold climate22.0 SEER2 · 9.5 HSPF2
LG ZRUM060GSS0 · cold climate23.0 SEER2 · 10.0 HSPF2
Cooper&Hunter CH-HPR55M-230VO · cold climate22.0 SEER2 · 9.5 HSPF2
Lennox VPD060H6M-5P · cold climate23.0 SEER2 · 11.0 HSPF2

See all 44 60,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of August 20, 2026. How we use the data.