What is the SEER2 rating of the 1HVAC EZ-48Z-M5?

The 1HVAC EZ-48Z-M5 is rated at up to 20.5 SEER2 and 11.0 EER2 for cooling and up to 9.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.

Is the 1HVAC EZ-48Z-M5 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 48,000 BTU model.

How much does the 1HVAC EZ-48Z-M5 cost to run per year?

At its rated efficiency it costs about $1,105-$3,228 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,400 in Phoenix and $2,726 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

What refrigerant does the 1HVAC EZ-48Z-M5 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.

48,000 BTU mini-split heat pump · ES SERIES

1HVAC EZ-48Z-M5

Below average cooling and heating efficiency for a 48,000 BTU mini-split heat pump, but not rated for cold climates.

Ranks #76 of 146 48,000 BTU mini-splits for cooling efficiency, and costs about $1,324 a year to run in a mixed climate like Atlanta.

SEER2: 20.5 Cooling efficiency over a season
Below average · beats 24%
HSPF2: 9.2 Heating efficiency over a season
Below average · beats 16%
EER2: 11.0 Cooling efficiency on a 95°F day
Below average · beats 9%
Heat at 5°F: 29,800 BTU/h62% of its 47°F output
Below average · beats 9%

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.
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

Specifications48,000 BTU, R-410A

General
Brand	1HVAC
Also sold as	InfinityLiving, DIYCOOL, PolarWave
Outdoor unit model	EZ-48Z-M5
Series	ES SERIES
Type	Mini-split heat pump
Nominal size	48,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-410A
Connected (smart) capable	No
On the market since	October 1, 2022
Last certified	June 25, 2026
Cooling
SEER2Seasonal efficiency, higher is better	20.5 (range 20.5)
EER2Efficiency at 95°F outdoors	11.0
Cooling capacity	48,000 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	9.2
Capacity at 47°F	48,000 BTU/h
Capacity at 17°F	36,000 BTU/h
Capacity at 5°F	29,800 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80
ENERGY STAR cold climate	No

Heating output as it gets colder62% 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 matchups4 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.
-	20.5	11.0	9.2	29,800	214810567
- InfinityLiving	20.5	11.0	9.2	29,800	214810573
- DIYCOOL	20.5	11.0	9.2	29,800	214810579
- PolarWave	20.5	11.0	9.2	29,800	214810585

Yearly running cost in 10 large cities$1,105-$3,228

Phoenix, AZ$1,400/yr
Miami, FL$1,105/yr
Houston, TX$1,256/yr
Atlanta, GA$1,324/yr
Los Angeles, CA$1,300/yr
New York, NY$3,228/yr
Chicago, IL$2,633/yr
Denver, CO$2,199/yr
Seattle, WA$1,359/yr
Minneapolis, MN$2,726/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 1HVAC EZ-48Z-M5?: The 1HVAC EZ-48Z-M5 is rated at up to 20.5 SEER2 and 11.0 EER2 for cooling and up to 9.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
Is the 1HVAC EZ-48Z-M5 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 48,000 BTU model.
How much does the 1HVAC EZ-48Z-M5 cost to run per year?: At its rated efficiency it costs about $1,105-$3,228 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,400 in Phoenix and $2,726 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
What refrigerant does the 1HVAC EZ-48Z-M5 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 $1,409/yrYou save $1,066/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 1HVAC EZ-48Z-M5

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: $1,409
Current system, per year: $2,475
You save per year: $1,066
Payback: 16.9 years
Net after 10 years: -$7,335

Cooling $824Heating $584Electricity used: 8,803 kWhSaved vs. a minimum-efficiency heat pump: $490

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 48,000 BTU models

LG KUMXB481A20.5 SEER2 · 9.5 HSPF2
Fujitsu AOUK048SSAN7 · cold climate20.2 SEER2 · 10.2 HSPF2
MDV M5OF-48HFN1-MQ1(2)20.5 SEER2 · 9.8 HSPF2
Mitsubishi Electric PUZ-AK48NLHZ · cold climate20.2 SEER2 · 9.2 HSPF2
LG KUMXA481A · cold climate20.5 SEER2 · 10.5 HSPF2
Lennox MMLD048S6S-1P · cold climate20.0 SEER2 · 10.4 HSPF2
LG KUMXB541A20.6 SEER2 · 9.5 HSPF2
Samsung AC048DXSCCG · cold climate20.0 SEER2 · 10.4 HSPF2

See all 146 48,000 BTU mini-splits, ranked

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