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DIRM4-18DA25-1Z

DIRM4-18DA25-1Z is in the certified data.

Its certified full-speed heating output at 5°F is 12,800–14,200 Btu/h, 71% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

Direct Air · mini-split heat pump

All 89 certified Direct Air models

DIRM4-18DA25-1Z is in the certified data as of Sep 19, 2026. DIRM4-18DA25-1Z changed its certified heat output at 17°F on AHRI certificate 216571369 from 13,600 Btu/h to 15,000 Btu/h in the certified data between August 2025 and September 2026.

4 certified pairings with 4 different figures. See all

Heating at 47°F

18,000

13,700 at 17°F

12,800 at 5°F

Btu/h, certified

2.05 COP at 5°F

Cooling at 95°F

18,000

Btu/h, certified

EER2 12.5 at 95°F

SEER2 22.3

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for DIRM4-18DA25-1Z, by outdoor temperature Heating: 12,800 Btu/h at 5°F, 13,700 Btu/h at 17°F, 18,000 Btu/h at 47°F. Cooling: 18,000 Btu/h at 95°F. The bars start at zero. Median of 1.5-ton mini-split models: 14,200 Btu/h at 5°F, 14,800 Btu/h at 17°F, 18,000 Btu/h at 47°F, 18,000 Btu/h at 95°F. 0 5,000 10,000 15,000 20,000 Btu/h 12,800 5°F 13,700 17°F 18,000 47°F 18,000 95°F Outdoor temperature (°F)
  • Heating output
  • Cooling output
  • Median of 1.5-ton mini-split models
  • Example heating load
  • Example cooling load
  • Frosting range, 17 to 45°F

This pairing delivers 18,000 Btu/h of heat at 47°F, 13,700 Btu/h at 17°F, and 12,800 Btu/h at 5°F, 71% of its 47°F rating. It delivers 18,000 Btu/h of cooling at 95°F. At 5°F that is 1,200 Btu/h short of the example heating load of 14,000 Btu/h; at 95°F it is 11,000 Btu/h above the example cooling load of 7,000 Btu/h.

Each bar is a separate certified test, drawn at its outdoor temperature, starting at zero. The 47°F figure is at normal speed; the 17 and 5°F figures are at full speed. The short dark line on each bar is the median of 1.5-ton mini-split models, one value per model. The shaded 17 to 45°F band is the frosting range: the outdoor coil can frost, and the unit pauses to defrost.

The dashed lines are example loads for a typical area of about 600 sq ft where winters reach 5°F: heating runs from 14,000 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 7,000 Btu/h at 95°F, at 1,000 sq ft per ton. A house in a hot climate or with large west-facing windows can need twice as much cooling. They are examples, not your building.

Calculate heating and cooling for your house

AHRI certificate 216571378 · listed by DIRECT AIR · certified Mar 4, 2025 · 1 pairing carries these values

Rebates where you live

Meets the recorded equipment thresholds of 67 programs in 35 states, provinces, or territories:Alabama (1), Arizona (1), California (3), Colorado (2), Connecticut (3), Delaware (2), Idaho (2), Illinois (1), Kentucky (1), Maine (2), Maryland (3), Massachusetts (3), Michigan (2), Minnesota (2), Mississippi (2), Nevada (1), New Hampshire (3), New Jersey (7), New York (4), Oregon (2), Pennsylvania (4), Rhode Island (3), Tennessee (1), Texas (2), Utah (1), Vermont (3), Washington (2), Wisconsin (1), British Columbia (3), Manitoba (1), New Brunswick (1), Newfoundland and Labrador (1), Nova Scotia (2), Ontario (1), Yukon (2).

All 67 programs by state and province

Alabama

Arizona

California

Colorado

Connecticut

Delaware

Idaho

Illinois

Kentucky

Maine

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Nevada

New Hampshire

New Jersey

New York

Oregon

Pennsylvania

Rhode Island

Tennessee

Texas

Utah

Vermont

Washington

Wisconsin

British Columbia

Manitoba

New Brunswick

Newfoundland and Labrador

Nova Scotia

Ontario

Yukon

Threshold comparisons use the unit’s median certified figures across its pairings, not the pairing selected above. Meeting these thresholds means the equipment may qualify; it does not guarantee approval. Service-area, installation, and product-list requirements also apply.

All rebate programs and their published thresholds

Certified output and power use

Certified output for the selected pairingThe four bars share one scale. The comparison is with the median of 1.5-ton mini-split models. Heating tests run at 70°F indoors. The cooling test runs at 80°F indoors.
Outdoor temperature Certified outputBtu/h One scale vs class median COPat 5°F
5°Ffull speed 12,8003.75 kW −10% 2.05
17°Ffull speed 13,7004.02 kW −7% NR
47°Fnormal speed 18,0005.28 kW 0% NR
95°Fcooling, full load 18,0005.28 kW — NR

EER2 12.5 in that test. SEER2 22.3 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test
1.83kW
Electrical input in the 95°F cooling test
1.44kW
Seasonal average heating COP
3.05

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 18,000 Btu heat pumps

1.5-ton mini-split models

This pairing at 5°F
12,800 Btu/h
This unit at 5°F median across its pairings
12,800 Btu/h
Median of 1.5-ton mini-split models at 5°F
14,200 Btu/h
Models in this group
1,110

This unit is above 17% of them, at number 925 of 1,110 by heat at 5°F. The middle half of the group runs 13,000 to 18,000 Btu/h.

This size class is defined by cooling capacity, so cooling is not compared here.

Among 18,000 Btu mini-split models, each by its median certified pairing, highest first: 5°F output as a share of its 47°F rating, 805th of 1,110 (tied); HSPF2, 101st of 1,114 (tied). Models without that figure are left out.

Similar ratings at 47°F

These mini-split models share the nominal cooling size. Comparisons use each model’s median certified figures across pairings.

  • RAC-PH18WHLAE: The same 18,000 Btu/h rating at 47°F; 23,000 Btu/h at 5°F (this model: 12,800).
  • AOU18RLXFZH: The same 18,000 Btu/h rating at 47°F; 22,000 Btu/h at 5°F (this model: 12,800).
  • AM2-H18/2DR3B: The same 18,000 Btu/h rating at 47°F; 21,800 Btu/h at 5°F (this model: 12,800).

Closest models by heat at 5°F

Every 18,000 Btu (1.5-ton) unit, ranked by cooling efficiency, then heating efficiency

Floor area at the cold test point

The median certified output of 12,800 Btu/h at 5°F matches the size calculator’s heating estimate for these floor areas, rounded to about 10 sq ft. Each range divides that output by the climate band’s heating rates.

Floor area by climate band and house condition
Climate bandHouse conditionBtu/h per sq ftApproximate sq ft
MildDrafty, little insulation24–42300–530
MildTypical16–26490–800
MildTight, well insulated10–18710–1,280
ColdDrafty, little insulation28–52250–460
ColdTypical18–30430–710
ColdTight, well insulated12–22580–1,070
Very coldDrafty, little insulation32–58220–400
Very coldTypical22–38340–580
Very coldTight, well insulated16–28460–800

This is an estimate, not a house-specific load calculation. Output stays at the 5°F test point for every band; it does not predict output at the band’s winter design temperature.

Certified values for DIRM4-18DA25-1Z

4 pairings · 4 AHRI certificates

This pairing is the one shown above. Under all pairings, a single figure means every pairing agrees and a range means the pairing decides.

This pairingAll pairings
Heating
Heat output at 47°F normal speed 18,000 Btu/h 18,000–20,000 Btu/h
Heat output at 17°F full speed 13,700 Btu/h 13,700–15,000 Btu/h
Heat output at 5°F full speed 12,800 Btu/h 12,800–14,200 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 71%
COP at 5°F full speed 2.05 2.05–2.40
HSPF2 Region IV 10.4 10.4–11.4
Cooling
Cooling capacity at 95°F full-load test 18,000 Btu/h 16,800–18,000 Btu/h
EER2 at 95°F 12.5 12.5–13.3
SEER2 cooling season 22.3 20.0–23.5
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-454B
Compressor Variable speed
Indoor unit DIRM4-18HP-CF 4 indoor units
FurnaceNo furnace None
Cold-climate designation EPA's designation, as published Yes On every pairing
ENERGY STAR Most Efficient EPA's designation, as published Yes On every pairing
Where it is sold US and Canada US and Canada
Model string as certified DIRM4-18DA25-1Z

Across 4 certified pairings with 4 indoor models: heat at 5°F 12,800 Btu/h with DIRM4-18HP-CA to 14,200 Btu/h with DIRM4-18HP-DU; HSPF2 10.4 with DIRM4-18HP-CF to 11.4 with DIRM4-18HP-CA; SEER2 20.0 with DIRM4-18HP-DU to 23.5 with DIRM4-18HP-WM. Endpoints name one indoor model where recorded; the furnace pairing can also change the figures.

Pairings, by indoor-unit class

4 indoor units · 4 certified pairings

One row per indoor unit certified with this outdoor unit.

Ductless indoor · 4 indoor units

  1. DIRM4-18HP-CA DIRECT AIR 12,800 Btu/hat 5°F, full speed

    1 pairing · 47°F 18,000 Btu/h · 95°F cooling 16,800 Btu/h · Cold output 71% · COP 2.20

  2. DIRM4-18HP-CF DIRECT AIR 12,800 Btu/hat 5°F, full speed

    1 pairing · 47°F 18,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 71% · COP 2.05

  3. DIRM4-18HP-DU DIRECT AIR 14,200 Btu/hat 5°F, full speed

    1 pairing · 47°F 20,000 Btu/h · 95°F cooling 17,500 Btu/h · Cold output 71% · COP 2.40

  4. DIRM4-18HP-WM DIRECT AIR 12,800 Btu/hat 5°F, full speed

    1 pairing · 47°F 18,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 71% · COP 2.10

Indoor units in the ductless indoor class
Indoor unit Brand At 5°FBtu/h · full speed At 47°FBtu/h · normal speed At 95°FBtu/h · cooling Cold output% of 47°F rating COP 5°Ffull speed Cold climate Pairings
DIRM4-18HP-CA DIRECT AIR 12,800 18,000 16,800 71% 2.20 Yes 1
DIRM4-18HP-CF DIRECT AIR 12,800 18,000 18,000 71% 2.05 Yes 1
DIRM4-18HP-DU DIRECT AIR 14,200 20,000 17,500 71% 2.40 Yes 1
DIRM4-18HP-WM DIRECT AIR 12,800 18,000 18,000 71% 2.10 Yes 1

The share is heat output at 5°F divided by the 47°F rating.

Showing 4 of 4 indoor units

Sold as, and units with identical certified values

Brands listing this model number

Model number as listed

  • DIRM4-18DA25-1Z 4 pairings

What affects the price

We don't have prices. These things drive the cost.

  • The size of the unit, and the indoor equipment on the same certificate.
  • Whether existing ductwork is reused, altered, or replaced.
  • The electrical work: a circuit, a disconnect, and sometimes a panel change.
  • Refrigerant line length and how the outdoor unit is mounted.
  • Permits and inspection, which vary by municipality.
  • Removing and disposing of the old equipment.
  • Local labor rates and how busy the season is.
  • Rebates and tax credits, which change and have deadlines.

Product history

  • DIRM4-18DA25-1Z changed its certified heat output at 17°F on AHRI certificate 216571369 from 13,600 Btu/h to 15,000 Btu/h in the certified data between August 2025 and September 2026.
  • DIRM4-18DA25-1Z first appeared in the certified data between November 2024 and February 2025.

History and definitions

Other DIR Series models by nominal cooling size: DIRM4-06HXPRO28-1Z (6,000 Btu), DIRM4-09DA25-1Z (9,000 Btu), DIRM4-09HXPRO28-1Z (9,000 Btu), DIRM4-12DA25-1Z (12,000 Btu), DIRM4-12HXPRO28-1Z (12,000 Btu), DIRM4-18CS19-OU (18,000 Btu), DIRM4-18HXPRO28-1Z (18,000 Btu), DIRM4-18MAGICPRO20-OU (18,000 Btu); more models from this brand.

Other DIRM4 Series models by nominal cooling size: DIRM4-09DA25-1Z (9,000 Btu), DIRM4-09HXPRO28-1Z (9,000 Btu), DIRM4-12DA25-1Z (12,000 Btu), DIRM4-12HXPRO28-1Z (12,000 Btu), DIRM4-18HXPRO28-1Z (18,000 Btu), DIRM4-24HXPRO28-1Z (24,000 Btu), DIRM4-30MAGICPRO20-OU (30,000 Btu), DIRM4-36MAGICPRO20-OU (36,000 Btu).

History

First certified record
Most recent certified record
Measurements reported
Mar 4, 2025
Status
In the certified data

Field definitions

COP
Heat delivered for each unit of electricity used. A COP of 2.5 gives 2.5 times the heat of an electric baseboard heater.
HSPF2
Heating efficiency over a typical season. Higher uses less electricity.
SEER2
Cooling efficiency over a typical season. Higher uses less electricity.
EER2
Cooling output divided by electrical input in the 95°F full-load test, in Btu/h per watt.
Cold output
Heat output at 5°F as a percentage of the 47°F rating.
% of rating at 17°F
Heat output at 17°F as a percentage of the 47°F rating.

NR not in the certified dataNC not cold-climate certifiedSP single pairing onlyVP varies by pairing; see the pairings tableWD withdrawn since the certified data was last read

Cite or print this page

Heat Pump List, “DIRM4-18DA25-1Z — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/dirm4-18da25-1z