What is the SEER2 rating of the Ruud RO2HFZ18AJ1H?

The Ruud RO2HFZ18AJ1H is rated at up to 21.5 SEER2 and 13.5 EER2 for cooling and up to 9.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the Ruud RO2HFZ18AJ1H good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 22,000 BTU/h at 5°F with a COP of 1.84, so it is still 1.8 times as efficient as electric resistance heat at that temperature.

How much does the Ruud RO2HFZ18AJ1H cost to run per year?

At its rated efficiency it costs about $395-$1,159 a year in electricity in large U.S. cities, depending on climate and local rates - for example $501 in Phoenix and $979 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

What refrigerant does the Ruud RO2HFZ18AJ1H 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 · Classic Plus

Ruud RO2HFZ18AJ1H

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

Ranks #286 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $475 a year to run in a mixed climate like Atlanta.

SEER2: 21.5 Cooling efficiency over a season
Below average · beats 39%
HSPF2: 9.6 Heating efficiency over a season
Below average · beats 30%
EER2: 13.5 Cooling efficiency on a 95°F day
Very good · beats 74%
Heat at 5°F: 22,000 BTU/h122% of its 47°F output
Below average · beats 18%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 22,000 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.
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	Ruud
Also sold as	Rheem
Outdoor unit model	RO2HFZ18AJ1H
Series	Classic Plus
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	January 1, 2023
Last certified	April 17, 2026
Cooling
SEER2Seasonal efficiency, higher is better	21.5 (range 21.5)
EER2Efficiency at 95°F outdoors	13.5
Cooling capacity	18,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.6
Capacity at 47°F	18,000 BTU/h
Capacity at 17°F	14,200 BTU/h
Capacity at 5°F	22,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.84
ENERGY STAR cold climate	Yes

Heating output as it gets colder122% 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 matchups2 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.
- RUUD · cold climate	21.5	13.5	9.6	22,000	211044460
- RHEEM · cold climate	21.5	13.5	9.6	22,000	211044459

Yearly running cost in 10 large cities$395-$1,159

Phoenix, AZ$501/yr
Miami, FL$395/yr
Houston, TX$450/yr
Atlanta, GA$475/yr
Los Angeles, CA$466/yr
New York, NY$1,159/yr
Chicago, IL$946/yr
Denver, CO$790/yr
Seattle, WA$488/yr
Minneapolis, MN$979/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 Ruud RO2HFZ18AJ1H?: The Ruud RO2HFZ18AJ1H is rated at up to 21.5 SEER2 and 13.5 EER2 for cooling and up to 9.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the Ruud RO2HFZ18AJ1H good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 22,000 BTU/h at 5°F with a COP of 1.84, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
How much does the Ruud RO2HFZ18AJ1H cost to run per year?: At its rated efficiency it costs about $395-$1,159 a year in electricity in large U.S. cities, depending on climate and local rates - for example $501 in Phoenix and $979 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
What refrigerant does the Ruud RO2HFZ18AJ1H 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 $505/yrYou save $423/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 Ruud RO2HFZ18AJ1H

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: $505
Current system, per year: $928
You save per year: $423
Payback: 16.5 years
Net after 10 years: -$2,766

Cooling $295Heating $210Electricity used: 3,154 kWhSaved vs. a minimum-efficiency heat pump: $207

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

Mitsubishi Electric MUZ-GS18NAHZ · cold climate21.5 SEER2 · 9.6 HSPF2
AUX AFEB18HP230V2CO · cold climate21.5 SEER2 · 9.5 HSPF2
Fujitsu AOU18RLXFZH · cold climate21.5 SEER2 · 9.6 HSPF2
Lennox MWHD018S6-1P21.5 SEER2 · 9.0 HSPF2
Mitsubishi Electric MUZ-GS18NAH21.5 SEER2 · 10.0 HSPF2
Samsung AR18DXFAMWKX21.5 SEER2 · 9.0 HSPF2
Mitsubishi Electric MUZ-GS18NA21.5 SEER2 · 10.3 HSPF2
GREE GWH18ATDXE-D6DNA1C/O · cold climate21.5 SEER2 · 8.5 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.