What is the SEER2 rating of the TCL TSH18HEI2NAN0T24?

The TCL TSH18HEI2NAN0T24 is rated at up to 23.0 SEER2 and 12.5 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 5 certified matchups SEER2 ranges from 20.3-23.0.

Is the TCL TSH18HEI2NAN0T24 good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 13,600 BTU/h at 5°F with a COP of 1.85, so it is still 1.9 times as efficient as electric resistance heat at that temperature.

How much does the TCL TSH18HEI2NAN0T24 cost to run per year?

At its rated efficiency it costs about $350-$1,097 a year in electricity in large U.S. cities, depending on climate and local rates - for example $454 in Phoenix and $934 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the TCL TSH18HEI2NAN0T24 the same as the DELLA 048-TP-18K2V-23S-OUT?

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

Which indoor units work with the TCL TSH18HEI2NAN0T24?

ENERGY STAR lists 5 certified combinations for this outdoor unit. The highest-rated ones use TSH18IEI2NAN0T24, TFH18IEI2NAF24, TCH18IEI2NAC24.

18,000 BTU mini-split heat pump · T-Pro-24ES

TCL TSH18HEI2NAN0T24

Average cooling and heating efficiency for a 18,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #150 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $443 a year to run in a mixed climate like Atlanta.

SEER2: 23.0 Cooling efficiency over a season
Average · beats 62%
HSPF2: 10.0 Heating efficiency over a season
Average · beats 43%
EER2: 12.5 Cooling efficiency on a 95°F day
Average · beats 44%
Heat at 5°F: 13,600 BTU/h72% of its 47°F output
Below average · beats 20%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 13,600 BTU/h at 5°F.
You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

Nothing stands out - its ratings have no weak spot for its class.

Calculate my running cost

Details

Specifications18,000 BTU, R-454B

General
Brand	TCL
Also sold as	DELLA
Outdoor unit model	TSH18HEI2NAN0T24
Series	T-Pro-24ES
Type	Mini-split heat pump
Nominal size	18,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	June 25, 2024
Last certified	June 9, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.0 (range 20.3-23.0)
EER2Efficiency at 95°F outdoors	11.0-12.5
Cooling capacity	16,000-18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.5-10.0
Capacity at 47°F	18,000-19,000 BTU/h
Capacity at 17°F	14,500-15,000 BTU/h
Capacity at 5°F	13,200-13,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80-1.85
ENERGY STAR cold climate	Yes

Heating output as it gets colder72% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with TSH18IEI2NAN0T24 at the standard test temperatures, in BTU/h:

Certified matchups5 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.
TSH18IEI2NAN0T24 · cold climate	23.0	12.5	10.0	13,600	215222838
TFH18IEI2NAF24 · cold climate	20.5	11.7	9.0	13,200	216706235
TCH18IEI2NAC24 · cold climate	20.5	11.0	8.5	13,200	216706229
- · cold climate	20.3	11.0	10.0	13,200	216706241
TDH18IEI2NAD24 · cold climate	20.3	11.0	10.0	13,200	218471401

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the TCL TSH18HEI2NAN0T24: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

DELLA 048-TP-18K2V-23S-OUT

Yearly running cost in 10 large cities$350-$1,097

Phoenix, AZ$454/yr
Miami, FL$350/yr
Houston, TX$408/yr
Atlanta, GA$443/yr
Los Angeles, CA$438/yr
New York, NY$1,097/yr
Chicago, IL$898/yr
Denver, CO$752/yr
Seattle, WA$467/yr
Minneapolis, MN$934/yr

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

Questions6

What is the SEER2 rating of the TCL TSH18HEI2NAN0T24?: The TCL TSH18HEI2NAN0T24 is rated at up to 23.0 SEER2 and 12.5 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 5 certified matchups SEER2 ranges from 20.3-23.0.
Is the TCL TSH18HEI2NAN0T24 good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 13,600 BTU/h at 5°F with a COP of 1.85, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
How much does the TCL TSH18HEI2NAN0T24 cost to run per year?: At its rated efficiency it costs about $350-$1,097 a year in electricity in large U.S. cities, depending on climate and local rates - for example $454 in Phoenix and $934 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the TCL TSH18HEI2NAN0T24 the same as the DELLA 048-TP-18K2V-23S-OUT?: Yes, as far as the certified ratings go. ENERGY STAR lists both 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.
Which indoor units work with the TCL TSH18HEI2NAN0T24?: ENERGY STAR lists 5 certified combinations for this outdoor unit. The highest-rated ones use TSH18IEI2NAN0T24, TFH18IEI2NAF24, TCH18IEI2NAC24.
What refrigerant does the TCL TSH18HEI2NAN0T24 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 $462/yrYou save $431/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 TSH18HEI2NAN0T24

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: $462
Current system, per year: $893
You save per year: $431
Payback: 15.1 years
Net after 10 years: -$2,188

Cooling $260Heating $202Electricity used: 2,886 kWhSaved vs. a minimum-efficiency heat pump: $225

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 18,000 BTU models

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York YRAMG18N2HAA23.0 SEER2 · 10.0 HSPF2
Panasonic CU - 3YM18CBUC · cold climate23.0 SEER2 · 10.0 HSPF2
ZERO ZMSB-18HVT-USHHR2 · cold climate23.0 SEER2 · 10.0 HSPF2
MIRAGE OMZH181C · cold climate23.0 SEER2 · 10.0 HSPF2
GARVEE GMS18 PRO · cold climate23.0 SEER2 · 9.5 HSPF2
LG KUSAB181A · cold climate23.0 SEER2 · 10.0 HSPF2

See all 465 18,000 BTU mini-splits, ranked

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