What is the SEER2 rating of the ZERO Z5SOV-42HDTB-US?

The ZERO Z5SOV-42HDTB-US is rated at up to 22.0 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; across its 2 certified matchups SEER2 ranges from 19.5-22.0.

Is the ZERO Z5SOV-42HDTB-US good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 33,000 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 ZERO Z5SOV-42HDTB-US cost to run per year?

At its rated efficiency it costs about $900-$2,604 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,137 in Phoenix and $2,197 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the ZERO Z5SOV-42HDTB-US the same as the KANIONco KWSMO-42IR454BHS19?

Yes, as far as the certified ratings go. ENERGY STAR lists 4 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.

42,000 BTU mini-split heat pump · Z-MAX

ZERO Z5SOV-42HDTB-US

Average cooling and heating efficiency for a 42,000 BTU mini-split heat pump, and certified for cold climates.

Ranks #19 of 61 42,000 BTU mini-splits for cooling efficiency, and costs about $1,070 a year to run in a mixed climate like Atlanta.

SEER2: 22.0 Cooling efficiency over a season
Average · beats 48%
HSPF2: 10.0 Heating efficiency over a season
Average · beats 43%
EER2: 11.2 Cooling efficiency on a 95°F day
Below average · beats 11%
Heat at 5°F: 33,000 BTU/h71% of its 47°F output
Average · beats 48%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 33,000 BTU/h at 5°F.
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

Specifications42,000 BTU, R-454B

General
Brand	ZERO
Also sold as	KANIONco, Pioneer, VKIN
Outdoor unit model	Z5SOV-42HDTB-US
Series	Z-MAX
Type	Mini-split heat pump
Nominal size	42,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-454B
Connected (smart) capable	No
On the market since	November 20, 2024
Last certified	June 25, 2026
Cooling
SEER2Seasonal efficiency, higher is better	22.0 (range 19.5-22.0)
EER2Efficiency at 95°F outdoors	11.1-11.2
Cooling capacity	41,000-42,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.0-10.0
Capacity at 47°F	42,000 BTU/h
Capacity at 17°F	31,000-34,400 BTU/h
Capacity at 5°F	30,000-33,000 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.90-2.00
ENERGY STAR cold climate	Yes

Heating output as it gets colder71% 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	22.0	11.2	10.0	30,000	216723123
- · cold climate	19.5	11.1	9.0	33,000	216723127

Same unit, other model numbers3

These model numbers have exactly the same certified ratings and matchups as the ZERO Z5SOV-42HDTB-US: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

KANIONco KWSMO-42IR454BHS19
Pioneer YN050GLSI24M5G
VKIN URHT-42FM5N4

Yearly running cost in 10 large cities$900-$2,604

Phoenix, AZ$1,137/yr
Miami, FL$900/yr
Houston, TX$1,020/yr
Atlanta, GA$1,070/yr
Los Angeles, CA$1,050/yr
New York, NY$2,604/yr
Chicago, IL$2,123/yr
Denver, CO$1,773/yr
Seattle, WA$1,095/yr
Minneapolis, MN$2,197/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 ZERO Z5SOV-42HDTB-US?: The ZERO Z5SOV-42HDTB-US is rated at up to 22.0 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; across its 2 certified matchups SEER2 ranges from 19.5-22.0.
Is the ZERO Z5SOV-42HDTB-US good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 33,000 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 ZERO Z5SOV-42HDTB-US cost to run per year?: At its rated efficiency it costs about $900-$2,604 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,137 in Phoenix and $2,197 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the ZERO Z5SOV-42HDTB-US the same as the KANIONco KWSMO-42IR454BHS19?: Yes, as far as the certified ratings go. ENERGY STAR lists 4 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 ZERO Z5SOV-42HDTB-US use?: It uses R-454B.

Running cost and savings

Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

Heat pump $1,142/yrYou save $1,023/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 ZERO Z5SOV-42HDTB-US

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: $1,142
Current system, per year: $2,166
You save per year: $1,023
Payback: 15.6 years
Net after 10 years: -$5,768

Cooling $672Heating $470Electricity used: 7,140 kWhSaved vs. a minimum-efficiency heat pump: $519

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 42,000 BTU models

TURBRO GREENLAND-M42K/O · cold climate22.0 SEER2 · 10.0 HSPF2
Friedrich FPHMR42A3D · cold climate22.0 SEER2 · 9.5 HSPF2
TCL H42FMH20XPC · cold climate22.0 SEER2 · 10.0 HSPF2
Guardian UMC48CN23STG1 · cold climate22.0 SEER2 · 9.5 HSPF2
Fujitsu AOUH45KWBS5 · cold climate22.0 SEER2 · 10.0 HSPF2
Hisense AMW5-42U3TQA · cold climate22.0 SEER2 · 9.5 HSPF2
Fujitsu AOUH45KWAS5 · cold climate22.0 SEER2 · 10.0 HSPF2
OLMO OS-RMS42-230VO · cold climate22.0 SEER2 · 9.5 HSPF2

See all 61 42,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 25, 2026. How we use the data.