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KUSXA181A

KUSXA181A is in the certified data.

Its certified full-speed heating output at 5°F is 17,000–24,000 Btu/h, 85–120% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

LG · central heat pump

KUSXA181A is in the certified data as of Sep 19, 2026. KUSXA181A changed its certified SEER2 on AHRI certificate 217284907 from 17.5 to 18.0 in the certified data between June 2025 and September 2026.

10 certified pairings with 7 different figures. See all

Heating at 47°F

20,000

13,000 at 17°F

19,000 at 5°F

Btu/h, certified

2.00 COP at 5°F

Cooling at 95°F

18,000

Btu/h, certified

EER2 11.5 at 95°F

SEER2 17.0

Heating and cooling by outdoor temperature

Certified heating at 5, 17, and 47°F and cooling at 95°F for KUSXA181A, by outdoor temperature Heating: 19,000 Btu/h at 5°F, 13,000 Btu/h at 17°F, 20,000 Btu/h at 47°F. Cooling: 18,000 Btu/h at 95°F. The bars start at zero. Median of 1.5-ton central models: 11,200 Btu/h at 5°F, 12,600 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 25,000 Btu/h 19,000 5°F 13,000 17°F 20,000 47°F 18,000 95°F Outdoor temperature (°F)
  • Heating output
  • Cooling output
  • Median of 1.5-ton central models
  • Example heating load
  • Example cooling load
  • Frosting range, 17 to 45°F

This pairing delivers 20,000 Btu/h of heat at 47°F, 13,000 Btu/h at 17°F, and 19,000 Btu/h at 5°F, 95% of its 47°F rating. It delivers 18,000 Btu/h of cooling at 95°F. At 5°F that is 8,000 Btu/h above the example heating load of 11,000 Btu/h; at 95°F it is 12,500 Btu/h above the example cooling load of 5,500 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 central 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 450 sq ft where winters reach 5°F: heating runs from 11,000 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 5,500 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 217284946 · listed by LG · certified Apr 22, 2026 · 2 pairings share these values

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 central 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 19,0005.57 kW +70% 2.00
17°Ffull speed 13,0003.81 kW +3% NR
47°Fnormal speed 20,0005.86 kW +11% NR
95°Fcooling, full load 18,0005.28 kW — NR

EER2 11.5 in that test. SEER2 17.0 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test
2.78kW
Electrical input in the 95°F cooling test
1.57kW
Seasonal average heating COP
2.78

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 18,000 Btu heat pumps

1.5-ton central models

This pairing at 5°F
19,000 Btu/h
This unit at 5°F median across its pairings
19,000 Btu/h
Median of 1.5-ton central models at 5°F
11,200 Btu/h
Models in this group
243

This unit is above 95% of them, at number 11 of 243 by heat at 5°F. The middle half of the group runs 8,600 to 18,000 Btu/h.

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

Closest models by heat at 5°F

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

Certified values for KUSXA181A

10 pairings · 10 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 20,000 Btu/h 20,000 Btu/h
Heat output at 17°F full speed 13,000 Btu/h 12,900–13,600 Btu/h
Heat output at 5°F full speed 19,000 Btu/h 17,000–24,000 Btu/h
Heat output below 5°F NR NR
Cold output 5°F output as a % of the 47°F rating 95%
COP at 5°F full speed 2.00 1.80–2.00
HSPF2 Region IV 9.5 8.1–10.0
Cooling
Cooling capacity at 95°F full-load test 18,000 Btu/h 17,000–18,000 Btu/h
EER2 at 95°F 11.5 11.5–13.5
SEER2 cooling season 17.0 15.2–20.5
Cooling at other temperatures NR NR
Equipment and listing
Refrigerant R-32
Compressor Variable speed
Indoor unit LKMMA18B1 7 indoor units
FurnaceLNA**060B1 2 furnaces
Cold-climate designation EPA's designation, as published Yes On every pairing
ENERGY STAR Most Efficient EPA's designation, as published Yes On some pairings
Where it is sold US and Canada US and Canada
Model string as certified KUSXA181A

Pairings, by indoor-unit class

7 indoor units · 10 certified pairings

One row per indoor unit certified with this outdoor unit.

Air handler · 3 indoor units

  1. LKMMA18B1 brand not stated 19,000 Btu/hat 5°F, full speed

    3 pairings, 2 with a furnace · 47°F 20,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 95% · COP 2.00

  2. KNSLA181A LG 24,000 Btu/hat 5°F, full speed

    2 pairings · 47°F 20,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 120% · COP 1.90

  3. LKMMA18A1 brand not stated 18,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 20,000 Btu/h · 95°F cooling 17,000 Btu/h · Cold output 90% · COP 1.80

Indoor units in the air handler 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
LKMMA18B1 — 19,000 20,000 18,000 95% 2.00 Yes 3
KNSLA181A LG 24,000 20,000 18,000 120% 1.90 Yes 2
LKMMA18A1 — 18,000 20,000 17,000 90% 1.80 Yes 1

Ductless indoor · 4 indoor units

  1. KNSFB181A LG 17,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 20,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 85% · COP 1.80

  2. KNUDB181A LG 20,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 20,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 100% · COP 1.80

  3. KNUFB181A LG 17,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 20,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 85% · COP 1.80

  4. KNUJB181A LG 20,000 Btu/hat 5°F, full speed

    1 pairing · 47°F 20,000 Btu/h · 95°F cooling 18,000 Btu/h · Cold output 100% · COP 1.94

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
KNSFB181A LG 17,000 20,000 18,000 85% 1.80 Yes 1
KNUDB181A LG 20,000 20,000 18,000 100% 1.80 Yes 1
KNUFB181A LG 17,000 20,000 18,000 85% 1.80 Yes 1
KNUJB181A LG 20,000 20,000 18,000 100% 1.94 Yes 1

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

Showing 7 of 7 indoor units

Sold as, and units with identical certified values

Brands listing this model number

Model number as listed

  • KUSXA181A 10 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

  • KUSXA181A changed its certified SEER2 on AHRI certificate 217284907 from 17.5 to 18.0 in the certified data between June 2025 and September 2026.
  • KUSXA181A changed its certified HSPF2 on AHRI certificate 217284907 from 9.5 to 10.0 in the certified data between June 2025 and September 2026.
  • KUSXA181A changed its certified COP at 5°F on AHRI certificate 217284907 from 2.00 to 1.90 in the certified data between June 2025 and September 2026.
  • KUSXA181A changed its certified heat output at 5°F on AHRI certificate 217284907 from 25,000 Btu/h to 24,000 Btu/h in the certified data between June 2025 and September 2026.
  • KUSXA181A changed its certified SEER2 on AHRI certificate 215588567 from 17.5 to 18.0 in the certified data between May 2025 and June 2025.
  • KUSXA181A changed its certified HSPF2 on AHRI certificate 215588567 from 9.5 to 10.0 in the certified data between May 2025 and June 2025.
  • KUSXA181A changed its certified COP at 5°F on AHRI certificate 215588567 from 2.00 to 1.90 in the certified data between May 2025 and June 2025.
  • KUSXA181A changed its certified heat output at 5°F on AHRI certificate 215588567 from 25,000 Btu/h to 24,000 Btu/h in the certified data between May 2025 and June 2025.
  • KUSXA181A changed its certified HSPF2 on 2 pairings in the certified data between March 2025 and May 2025. The new figure is higher on 1 and lower on 1.
  • KUSXA181A was in the certified data by September 2024.

History and definitions

History

First certified record
Most recent certified record
Measurements reported
Apr 22, 2026
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, “KUSXA181A — certified heat output”. Certified figures dated , checked daily.
https://heatpumplist.com/model/kusxa181a