What is the SEER2 rating of the TGM GRH32IT18AS?

The TGM GRH32IT18AS is rated at up to 21.5 SEER2 and 11.8 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the TGM GRH32IT18AS good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 13,000 BTU/h at 5°F with a COP of 1.90, so it is still 1.9 times as efficient as electric resistance heat at that temperature.

How much does the TGM GRH32IT18AS cost to run per year?

At its rated efficiency it costs about $397-$1,313 a year in electricity in large U.S. cities, depending on climate and local rates - for example $525 in Phoenix and $1,124 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the TGM GRH32IT18AS the same as the CLASSIC GRH32IC18AS?

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 TGM GRH32IT18AS?

ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses GWH32IT18S.

18,000 BTU mini-split heat pump · Zeno

TGM GRH32IT18AS

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

Ranks #291 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $525 a year to run in a mixed climate like Atlanta.

SEER2: 21.5 Cooling efficiency over a season
Below average · beats 39%
HSPF2: 8.5 Heating efficiency over a season
Below average · beats 2%
EER2: 11.8 Cooling efficiency on a 95°F day
Below average · beats 18%
Heat at 5°F: 13,000 BTU/h70% of its 47°F output
Below average · beats 27%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 13,000 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.
You mainly need heat - its HSPF2 is below average for mini-splits.

Calculate my running cost

Details

Specifications18,000 BTU, R-32

General
Brand	TGM
Also sold as	CLASSIC
Outdoor unit model	GRH32IT18AS
Series	Zeno
Type	Mini-split heat pump
Nominal size	18,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-32
Connected (smart) capable	No
On the market since	July 9, 2025
Last certified	March 17, 2026
Cooling
SEER2Seasonal efficiency, higher is better	21.5 (range 21.5)
EER2Efficiency at 95°F outdoors	11.8
Cooling capacity	18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.5
Capacity at 47°F	18,500 BTU/h
Capacity at 17°F	15,000 BTU/h
Capacity at 5°F	13,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.90
ENERGY STAR cold climate	Yes

Heating output as it gets colder70% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with GWH32IT18S at the standard test temperatures, in BTU/h:

Certified matchups1 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.
GWH32IT18S · cold climate	21.5	11.8	8.5	13,000	216025768

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the TGM GRH32IT18AS: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

CLASSIC GRH32IC18AS

Yearly running cost in 10 large cities$397-$1,313

Phoenix, AZ$525/yr
Miami, FL$397/yr
Houston, TX$471/yr
Atlanta, GA$525/yr
Los Angeles, CA$521/yr
New York, NY$1,313/yr
Chicago, IL$1,077/yr
Denver, CO$905/yr
Seattle, WA$563/yr
Minneapolis, MN$1,124/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 TGM GRH32IT18AS?: The TGM GRH32IT18AS is rated at up to 21.5 SEER2 and 11.8 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the TGM GRH32IT18AS good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 13,000 BTU/h at 5°F with a COP of 1.90, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
How much does the TGM GRH32IT18AS cost to run per year?: At its rated efficiency it costs about $397-$1,313 a year in electricity in large U.S. cities, depending on climate and local rates - for example $525 in Phoenix and $1,124 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the TGM GRH32IT18AS the same as the CLASSIC GRH32IC18AS?: 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 TGM GRH32IT18AS?: ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses GWH32IT18S.
What refrigerant does the TGM GRH32IT18AS 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 $538/yrYou save $398/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 TGM GRH32IT18AS

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: $538
Current system, per year: $936
You save per year: $398
Payback: 17.6 years
Net after 10 years: -$3,022

Cooling $295Heating $244Electricity used: 3,365 kWhSaved vs. a minimum-efficiency heat pump: $181

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

GREE GWH18ATDXE-D6DNA1C/O · cold climate21.5 SEER2 · 8.5 HSPF2
Bosch BMS500-AAS018-1CSXHD · cold climate21.4 SEER2 · 12.3 HSPF2
Samsung AR18DXFAMWKX21.5 SEER2 · 9.0 HSPF2
Breeze33 BZ33-HYP18OUT2-454-G3-P · cold climate21.4 SEER2 · 12.3 HSPF2
Lennox MWHD018S6-1P21.5 SEER2 · 9.0 HSPF2
Capella CPPB-H18A-O · cold climate21.4 SEER2 · 12.3 HSPF2
AUX AFEB18HP230V2CO · cold climate21.5 SEER2 · 9.5 HSPF2
Comfort-Aire A-VHP18SA-1 · cold climate21.4 SEER2 · 12.3 HSPF2

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

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of March 17, 2026. How we use the data.