What is the SEER2 rating of the TOSOT HP-UA36/O?

The TOSOT HP-UA36/O is rated at up to 18.2 SEER2 and 11.2 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 TOSOT HP-UA36/O good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 34,000 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 TOSOT HP-UA36/O cost to run per year?

At its rated efficiency it costs about $875-$2,186 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,058 in Phoenix and $1,810 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the TOSOT HP-UA36/O the same as the GREE WLUD36W2/NHE-D(U)?

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 TOSOT HP-UA36/O?

ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses HP-UA36/I.

3-ton central heat pump · E Series

TOSOT HP-UA36/O

Very good cooling and heating efficiency for a 3-ton central heat pump, and certified for cold climates.

Ranks #80 of 302 3 ton central heat pumps for cooling efficiency, and costs about $930 a year to run in a mixed climate like Atlanta.

SEER2: 18.2 Cooling efficiency over a season
Very good · beats 73%
HSPF2: 10.0 Heating efficiency over a season
Very good · beats 84%
EER2: 11.2 Cooling efficiency on a 95°F day
Below average · beats 28%
Heat at 5°F: 34,000 BTU/h100% of its 47°F output
Below average · beats 39%

A good fit if…

You want low cooling bills - its SEER2 beats 73% of central heat pumps.
Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 34,000 BTU/h at 5°F.
It will heat most of the year - its HSPF2 beats 84% of central heat pumps.
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

Specifications3 ton, R-32

General
Brand	TOSOT
Also sold as	GREE
Outdoor unit model	HP-UA36/O
Series	E Series
Type	Central heat pump
Nominal size	3 ton
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-32
Connected (smart) capable	No
On the market since	March 10, 2025
Last certified	August 20, 2026
Cooling
SEER2Seasonal efficiency, higher is better	18.2 (range 18.2)
EER2Efficiency at 95°F outdoors	11.2
Cooling capacity	34,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0
Capacity at 47°F	34,000 BTU/h
Capacity at 17°F	32,600 BTU/h
Capacity at 5°F	34,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder100% kept at 5°F

Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with HP-UA36/I 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.
HP-UA36/I · cold climate	18.2	11.2	10.0	34,000	217469233

Same unit, other model numbers1

These model numbers have exactly the same certified ratings and matchups as the TOSOT HP-UA36/O: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

GREE WLUD36W2/NHE-D(U)

Yearly running cost in 10 large cities$875-$2,186

Phoenix, AZ$1,058/yr
Miami, FL$875/yr
Houston, TX$947/yr
Atlanta, GA$930/yr
Los Angeles, CA$898/yr
New York, NY$2,186/yr
Chicago, IL$1,768/yr
Denver, CO$1,464/yr
Seattle, WA$895/yr
Minneapolis, MN$1,810/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 TOSOT HP-UA36/O?: The TOSOT HP-UA36/O is rated at up to 18.2 SEER2 and 11.2 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 TOSOT HP-UA36/O good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 34,000 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 TOSOT HP-UA36/O cost to run per year?: At its rated efficiency it costs about $875-$2,186 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,058 in Phoenix and $1,810 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the TOSOT HP-UA36/O the same as the GREE WLUD36W2/NHE-D(U)?: 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 TOSOT HP-UA36/O?: ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses HP-UA36/I.
What refrigerant does the TOSOT HP-UA36/O 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 $1,038/yrYou save $715/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 HP-UA36/O

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: $1,038
Current system, per year: $1,753
You save per year: $715
Payback: 18.2 years
Net after 10 years: -$5,853

Cooling $658Heating $381Electricity used: 6,490 kWhSaved vs. a minimum-efficiency heat pump: $306

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 3 ton models

BOREAL ENX36HPJ132OA · cold climate18.2 SEER2 · 10.0 HSPF2
AUX AHU36HPV1BO · cold climate18.2 SEER2 · 10.0 HSPF2
GREE WLUD36W2/NHG-D(U)18.5 SEER2 · 8.3 HSPF2
ACIQ ACIQ-36-HPD · cold climate18.0 SEER2 · 10.3 HSPF2
Samsung AC036BXUPCH · cold climate18.5 SEER2 · 8.4 HSPF2
AI AIR CONDITIONING AUO19-36N2-M3H-S · cold climate18.0 SEER2 · 10.3 HSPF2
Blueridge BMSAH36HHC · cold climate18.0 SEER2 · 10.3 HSPF2
Coleman HMH72B341 · cold climate18.5 SEER2 · 8.5 HSPF2

See all 302 3 ton central heat pumps, ranked

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