What is the SEER2 rating of the DIAL 36000Z-04-O?

The DIAL 36000Z-04-O is rated at up to 21.0 SEER2 and 12.5 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 19.5-21.0.

Is the DIAL 36000Z-04-O good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 36,000 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 DIAL 36000Z-04-O cost to run per year?

At its rated efficiency it costs about $720-$2,182 a year in electricity in large U.S. cities, depending on climate and local rates - for example $923 in Phoenix and $1,851 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the DIAL 36000Z-04-O the same as the DIAL MZME36WW4P230BAJ?

Yes, as far as the certified ratings go. ENERGY STAR lists 3 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.

What refrigerant does the DIAL 36000Z-04-O 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.

30,000 BTU mini-split heat pump · Hi MULTI Xtreme

DIAL 36000Z-04-O

Below average cooling and heating efficiency for a 30,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #103 of 171 30,000 BTU mini-splits for cooling efficiency, and costs about $888 a year to run in a mixed climate like Atlanta.

SEER2: 21.0 Cooling efficiency over a season
Below average · beats 30%
HSPF2: 9.0 Heating efficiency over a season
Below average · beats 10%
EER2: 12.5 Cooling efficiency on a 95°F day
Average · beats 44%
Heat at 5°F: 36,000 BTU/h113% 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 36,000 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

Specifications30,000 BTU, R-410A

General
Brand	DIAL
Also sold as	Westinghouse
Outdoor unit model	36000Z-04-O
Series	Hi MULTI Xtreme
Type	Mini-split heat pump
Nominal size	30,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	April 2, 2024
Last certified	June 13, 2026
Cooling
SEER2Seasonal efficiency, higher is better	21.0 (range 19.5-21.0)
EER2Efficiency at 95°F outdoors	12.0-12.5
Cooling capacity	32,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	8.9-9.0
Capacity at 47°F	32,000 BTU/h
Capacity at 17°F	22,400-23,000 BTU/h
Capacity at 5°F	36,000 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 colder113% 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.
- · cold climate	21.0	12.5	9.0	36,000	204793307
- · cold climate	19.5	12.0	8.9	36,000	204793305

Same unit, other model numbers2

These model numbers have exactly the same certified ratings and matchups as the DIAL 36000Z-04-O: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

DIAL MZME36WW4P230BAJ
Westinghouse WHP36M4A21S

Yearly running cost in 10 large cities$720-$2,182

Phoenix, AZ$923/yr
Miami, FL$720/yr
Houston, TX$829/yr
Atlanta, GA$888/yr
Los Angeles, CA$875/yr
New York, NY$2,182/yr
Chicago, IL$1,784/yr
Denver, CO$1,492/yr
Seattle, WA$924/yr
Minneapolis, MN$1,851/yr

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

Questions5

What is the SEER2 rating of the DIAL 36000Z-04-O?: The DIAL 36000Z-04-O is rated at up to 21.0 SEER2 and 12.5 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 19.5-21.0.
Is the DIAL 36000Z-04-O good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 36,000 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 DIAL 36000Z-04-O cost to run per year?: At its rated efficiency it costs about $720-$2,182 a year in electricity in large U.S. cities, depending on climate and local rates - for example $923 in Phoenix and $1,851 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the DIAL 36000Z-04-O the same as the DIAL MZME36WW4P230BAJ?: Yes, as far as the certified ratings go. ENERGY STAR lists 3 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.
What refrigerant does the DIAL 36000Z-04-O 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 $935/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 DIAL 36000Z-04-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: $935
Current system, per year: $1,650
You save per year: $715
Payback: 16.8 years
Net after 10 years: -$4,846

Cooling $536Heating $398Electricity used: 5,841 kWhSaved vs. a minimum-efficiency heat pump: $331

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 30,000 BTU models

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Friedrich FPHMR36A3A · cold climate21.0 SEER2 · 9.0 HSPF2
Airquest DLCSRBH30AAK21.0 SEER2 · 9.0 HSPF2
OLMO OS-MSR36-230VO · cold climate21.0 SEER2 · 9.0 HSPF2
Wells WSB-30HFMO21.0 SEER2 · 9.1 HSPF2
Goodman MSH303G20MCAA21.0 SEER2 · 8.7 HSPF2
Mitsutomo RO-SZ30-AB-Q21.0 SEER2 · 9.1 HSPF2
Midea 38MHRCQ30AA321.0 SEER2 · 8.7 HSPF2

See all 171 30,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 13, 2026. How we use the data.