What is the SEER2 rating of the TGM MC4VHT18S?

The TGM MC4VHT18S 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.

Is the TGM MC4VHT18S good for cold climates?

It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 18,000 BTU model.

How much does the TGM MC4VHT18S cost to run per year?

At its rated efficiency it costs about $371-$1,210 a year in electricity in large U.S. cities, depending on climate and local rates - for example $488 in Phoenix and $1,034 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the TGM MC4VHT18S the same as the CLASSIC MC4VHC18S?

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 MC4VHT18S?

ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses MUVHT18S.

What refrigerant does the TGM MC4VHT18S 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.

18,000 BTU mini-split heat pump · M series

TGM MC4VHT18S

Average cooling and heating efficiency for a 18,000 BTU mini-split heat pump, but not rated for cold climates.

Ranks #151 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $485 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: 13,000 BTU/h65% of its 47°F output
Average · beats 62%

A good fit if…

You want steady temperatures and quiet running - the compressor varies its speed.

Think twice if…

You often see nights below 0°F - it is not cold-climate certified.
You want the newest refrigerant - it uses R-410A, which is being phased down.

Calculate my running cost

Details

Specifications18,000 BTU, R-410A

General
Brand	TGM
Also sold as	CLASSIC
Outdoor unit model	MC4VHT18S
Series	M series
Type	Mini-split heat pump
Nominal size	18,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	August 18, 2022
Last certified	April 17, 2026
Cooling
SEER2Seasonal efficiency, higher is better	23.0 (range 23.0)
EER2Efficiency at 95°F outdoors	12.5
Cooling capacity	18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0
Capacity at 47°F	20,000 BTU/h
Capacity at 17°F	12,800 BTU/h
Capacity at 5°F	13,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.08
ENERGY STAR cold climate	No

Heating output as it gets colder65% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MUVHT18S 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.
MUVHT18S	23.0	12.5	10.0	13,000	209843023

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the TGM MC4VHT18S: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

CLASSIC MC4VHC18S

Yearly running cost in 10 large cities$371-$1,210

Phoenix, AZ$488/yr
Miami, FL$371/yr
Houston, TX$438/yr
Atlanta, GA$485/yr
Los Angeles, CA$481/yr
New York, NY$1,210/yr
Chicago, IL$992/yr
Denver, CO$833/yr
Seattle, WA$518/yr
Minneapolis, MN$1,034/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 MC4VHT18S?: The TGM MC4VHT18S 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.
Is the TGM MC4VHT18S good for cold climates?: It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 18,000 BTU model.
How much does the TGM MC4VHT18S cost to run per year?: At its rated efficiency it costs about $371-$1,210 a year in electricity in large U.S. cities, depending on climate and local rates - for example $488 in Phoenix and $1,034 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the TGM MC4VHT18S the same as the CLASSIC MC4VHC18S?: 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 MC4VHT18S?: ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses MUVHT18S.
What refrigerant does the TGM MC4VHT18S 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 $499/yrYou save $461/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 MC4VHT18S

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: $499
Current system, per year: $961
You save per year: $461
Payback: 15.2 years
Net after 10 years: -$2,386

Cooling $275Heating $224Electricity used: 3,122 kWhSaved vs. a minimum-efficiency heat pump: $242

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.

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ZERO ZMSB-18HVT-USHHR2 · cold climate23.0 SEER2 · 10.0 HSPF2
Pioneer YN018GLSI24RPG · cold climate23.0 SEER2 · 10.0 HSPF2
GARVEE GMS18 PRO · cold climate23.0 SEER2 · 9.5 HSPF2
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ROVSUN RV-18M2/O-R23.0 SEER2 · 9.5 HSPF2

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

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