What is the SEER2 rating of the Daikin 2MXT18AVJU?

The Daikin 2MXT18AVJU is rated at up to 21.0 SEER2 and 12.0 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 Daikin 2MXT18AVJU good for cold climates?

Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 20,600 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.

How much does the Daikin 2MXT18AVJU cost to run per year?

At its rated efficiency it costs about $386-$1,116 a year in electricity in large U.S. cities, depending on climate and local rates - for example $488 in Phoenix and $942 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.

Is the Daikin 2MXT18AVJU the same as the Daikin 2MXT18AVJU8?

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.

18,000 BTU mini-split heat pump · AURORA Multi

Daikin 2MXT18AVJU

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

Ranks #327 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $459 a year to run in a mixed climate like Atlanta.

SEER2: 21.0 Cooling efficiency over a season
Below average · beats 30%
HSPF2: 10.0 Heating efficiency over a season
Average · beats 43%
EER2: 12.0 Cooling efficiency on a 95°F day
Below average · beats 25%
Heat at 5°F: 20,600 BTU/h114% of its 47°F output
Below average · beats 9%

A good fit if…

Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 20,600 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.

Calculate my running cost

Details

Specifications18,000 BTU, R-32

General
Brand	Daikin
Outdoor unit model	2MXT18AVJU
Series	AURORA Multi
Type	Mini-split heat pump
Nominal size	18,000 BTU
CompressorVariable-speed units run longer at low power	Continuously variable
Refrigerant	R-32
Connected (smart) capable	No
On the market since	August 15, 2024
Last certified	July 17, 2026
Cooling
SEER2Seasonal efficiency, higher is better	21.0 (range 21.0)
EER2Efficiency at 95°F outdoors	12.0
Cooling capacity	17,200 BTU/h
Heating
HSPF2Seasonal efficiency, higher is better	10.0
Capacity at 47°F	18,000 BTU/h
Capacity at 17°F	18,600 BTU/h
Capacity at 5°F	20,600 BTU/h
COP at 5°F2.0 = twice as efficient as a space heater	1.80
ENERGY STAR cold climate	Yes

Heating output as it gets colder114% 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 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.
- DAIKIN · cold climate	21.0	12.0	10.0	20,600	214837760

Same unit, other model numbers3

These model numbers have exactly the same certified ratings and matchups as the Daikin 2MXT18AVJU: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

Daikin 2MXT18AVJU8
Daikin 2MXTH18AVJU
Daikin 2MXTH18AVJU8

Yearly running cost in 10 large cities$386-$1,116

Phoenix, AZ$488/yr
Miami, FL$386/yr
Houston, TX$438/yr
Atlanta, GA$459/yr
Los Angeles, CA$450/yr
New York, NY$1,116/yr
Chicago, IL$910/yr
Denver, CO$760/yr
Seattle, WA$469/yr
Minneapolis, MN$942/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 Daikin 2MXT18AVJU?: The Daikin 2MXT18AVJU is rated at up to 21.0 SEER2 and 12.0 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 Daikin 2MXT18AVJU good for cold climates?: Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 20,600 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
How much does the Daikin 2MXT18AVJU cost to run per year?: At its rated efficiency it costs about $386-$1,116 a year in electricity in large U.S. cities, depending on climate and local rates - for example $488 in Phoenix and $942 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
Is the Daikin 2MXT18AVJU the same as the Daikin 2MXT18AVJU8?: 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 Daikin 2MXT18AVJU 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 $490/yrYou save $410/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 Daikin 2MXT18AVJU

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: $490
Current system, per year: $900
You save per year: $410
Payback: 15.9 years
Net after 10 years: -$2,399

Cooling $288Heating $202Electricity used: 3,062 kWhSaved vs. a minimum-efficiency heat pump: $202

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

ECO AC EMH-2O18KBB · cold climate21.0 SEER2 · 10.0 HSPF2
Blueridge BMKH18MC · cold climate21.0 SEER2 · 10.0 HSPF2
Friedrich FPHSR18A3B · cold climate21.0 SEER2 · 10.0 HSPF2
AireForce DXH18FMK3IH · cold climate21.0 SEER2 · 10.0 HSPF2
Friedrich FPHSR18A3D · cold climate21.0 SEER2 · 10.0 HSPF2
NOVAIR LEA18MZ-2P-25SK-O · cold climate21.0 SEER2 · 10.2 HSPF2
GE Appliances ASH218JCDD21.0 SEER2 · 10.0 HSPF2
KANIONco KWSMO-18R410AIHMV · cold climate21.0 SEER2 · 10.2 HSPF2

See all 465 18,000 BTU mini-splits, ranked

Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 17, 2026. How we use the data.