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KUMXB541A

KUMXB541A is in the certified data.

Its certified full-speed heating output at 5°F is 39,000–41,000 Btu/h, 67–71% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

LG · mini-split heat pump

All 131 certified LG models

KUMXB541A is in the certified data as of Sep 19, 2026.

3 certified pairings with 3 different figures. See all

Heating at 47°F

58,000

37,200 at 17°F

40,000 at 5°F

Btu/h, certified

2.17 COP at 5°F

Cooling at 95°F

50,500

Btu/h, certified

EER2 12.55 at 95°F

SEER2 19.55

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for KUMXB541A, by outdoor temperature Heating: 40,000 Btu/h at 5°F, 37,200 Btu/h at 17°F, 58,000 Btu/h at 47°F. Cooling: 50,500 Btu/h at 95°F. The bars start at zero. Median of 4-ton mini-split models: 42,000 Btu/h at 5°F, 38,000 Btu/h at 17°F, 49,000 Btu/h at 47°F, 48,000 Btu/h at 95°F. 0 20,000 40,000 60,000 Btu/h 40,000 5°F 37,200 17°F 58,000 47°F 50,500 95°F Outdoor temperature (°F)
  • Heating output
  • Cooling output
  • Median of 4-ton mini-split models
  • Example heating load
  • Example cooling load
  • Frosting range, 17 to 45°F

This pairing delivers 58,000 Btu/h of heat at 47°F, 37,200 Btu/h at 17°F, and 40,000 Btu/h at 5°F, 69% of its 47°F rating. It delivers 50,500 Btu/h of cooling at 95°F. At 5°F that is 2,000 Btu/h short of the example heating load of 42,000 Btu/h; at 95°F it is 29,500 Btu/h above the example cooling load of 21,000 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 4-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 1,750 sq ft where winters reach 5°F: heating runs from 42,000 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 21,000 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 215408632 · listed by LG · certified Nov 7, 2025 · 1 pairing carries these values

Rebates where you live

Meets the recorded equipment thresholds of 46 programs in 25 states, provinces, or territories:Alabama (1), Arizona (1), California (3), Colorado (1), Delaware (2), Idaho (2), Illinois (1), Kentucky (1), Maryland (3), Michigan (2), Minnesota (1), Mississippi (2), Nevada (1), New Jersey (7), New York (4), Oregon (2), Pennsylvania (4), Tennessee (1), Texas (2), Utah (1), Vermont (3), Washington (1), Wisconsin (1), British Columbia (3), Newfoundland and Labrador (1).

All 46 programs by state and province

Alabama

Arizona

California

Colorado

Delaware

Idaho

Illinois

Kentucky

Maryland

Michigan

Minnesota

Mississippi

Nevada

New Jersey

New York

Oregon

Pennsylvania

Tennessee

Texas

Utah

Vermont

Washington

Wisconsin

British Columbia

Newfoundland and Labrador

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 4-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 40,00011.72 kW −5% 2.17
17°Ffull speed 37,20010.90 kW −2% NR
47°Fnormal speed 58,00017.00 kW +18% NR
95°Fcooling, full load 50,50014.80 kW — NR

EER2 12.55 in that test. SEER2 19.55 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test
5.40kW
Electrical input in the 95°F cooling test
4.02kW
Seasonal average heating COP
2.75

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 48,000 Btu heat pumps

4-ton mini-split models

This pairing at 5°F
40,000 Btu/h
This unit at 5°F median across its pairings
40,000 Btu/h
Median of 4-ton mini-split models at 5°F
42,000 Btu/h
Models in this group
321

This unit is above 47% of them, at number 171 of 321 by heat at 5°F. The middle half of the group runs 37,000 to 47,500 Btu/h.

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

Among 48,000 Btu mini-split models, each by its median certified pairing, highest first: 5°F output as a share of its 47°F rating, 281st of 321; HSPF2, 235th of 321 (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.

  • LMU543HV: The same 58,000 Btu/h rating at 47°F; 35,800 Btu/h at 5°F (this model: 40,000).
  • ARUM048GSS5: 58,500 Btu/h at 47°F (this model: 58,000); 48,000 Btu/h at 5°F (this model: 40,000).
  • PUZ-AK48NLHZ: 60,000 Btu/h at 47°F (this model: 58,000); 52,000 Btu/h at 5°F (this model: 40,000).

Closest models by heat at 5°F

Every 48,000 Btu (4-ton) unit, ranked by cooling efficiency, then heating efficiency

Floor area at the cold test point

The median certified output of 40,000 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 insulation24–42950–1,670
MildTypical16–261,540–2,500
MildTight, well insulated10–182,220–4,000
ColdDrafty, little insulation28–52770–1,430
ColdTypical18–301,330–2,220
ColdTight, well insulated12–221,820–3,330
Very coldDrafty, little insulation32–58690–1,250
Very coldTypical22–381,050–1,820
Very coldTight, well insulated16–281,430–2,500

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 KUMXB541A

3 pairings · 3 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 58,000 Btu/h 58,000 Btu/h
Heat output at 17°F full speed 37,200 Btu/h 37,200 Btu/h
Heat output at 5°F full speed 40,000 Btu/h 39,000–41,000 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 69%
COP at 5°F full speed 2.17 2.16–2.19
HSPF2 Region IV 9.4 9.3–9.5
Cooling
Cooling capacity at 95°F full-load test 50,500 Btu/h 50,500 Btu/h
EER2 at 95°F 12.55 12.5–12.6
SEER2 cooling season 19.55 18.5–20.6
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-32
Compressor Variable speed
Indoor unit None listed None
FurnaceNo furnace None
Cold-climate designation EPA's designation, as published NC NC
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 KUMXB541A

Pairings, by indoor-unit class

3 certified pairings

One row per indoor unit certified with this outdoor unit.

Ductless indoor

  1. None listed LG 40,000 Btu/hat 5°F, full speed

    3 pairings · 47°F 58,000 Btu/h · 95°F cooling 50,500 Btu/h · Cold output 69% · COP 2.17

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
None listed LG 40,000 58,000 50,500 69% 2.17 NC 3

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

Sold as, and units with identical certified values

Brands listing this model number

Model number as listed

  • KUMXB541A 3 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.

History and definitions

History

First certified record
Most recent certified record
Measurements reported
Nov 7, 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, “KUMXB541A — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/kumxb541a