KUSXB601A

KUSXB601A is in the certified data.

Its certified full-speed heating output at 5°F is 41,000–45,000 Btu/h, 78–82% of its 47°F rating (tests at different compressor speeds), depending on the pairing.

LG · central heat pump

KUSXB601A is in the certified data as of Sep 19, 2026.

54,000 Btu (4.5-ton)
Central
Variable speed
US and Canada

Heating at 47°F

56,000

36,400 at 17°F

44,000 at 5°F

Btu/h, certified

1.80 COP at 5°F

Cooling at 95°F

52,500

Btu/h, certified

EER2 10.5 at 95°F

SEER2 15.2

Heating and cooling by outdoor temperature

Heating output
Cooling output
Median of 4.5-ton central models
Example heating load
Example cooling load
Frosting range, 17 to 45°F

This pairing delivers 56,000 Btu/h of heat at 47°F, 36,400 Btu/h at 17°F, and 44,000 Btu/h at 5°F, 79% of its 47°F rating. It delivers 52,500 Btu/h of cooling at 95°F. At 5°F that is 4,000 Btu/h above the example heating load of 40,000 Btu/h; at 95°F it is 32,500 Btu/h above the example cooling load of 20,000 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 4.5-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 1,650 sq ft where winters reach 5°F: heating runs from 40,000 Btu/h at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 20,000 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 216445252 · listed by LG · certified Mar 31, 2025 · 1 pairing carries 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 4.5-ton central models. Heating tests run at 70°F indoors. The cooling test runs at 80°F indoors.
Outdoor temperature	Certified outputBtu/h	vs class median	COPat 5°F
5°Ffull speed	44,00012.90 kW	+10%	1.80
17°Ffull speed	36,40010.67 kW	−4%	NR
47°Fnormal speed	56,00016.41 kW	0%	NR
95°Fcooling, full load	52,50015.39 kW	—	NR

EER2 10.5 in that test. SEER2 15.2 over the modeled cooling season.

Power use at each temperature

Electrical input in the 5°F full-speed test: 7.16kW
Electrical input in the 95°F cooling test: 5.00kW
Seasonal average heating COP: 2.49

These exclude backup resistance heat.

Updated Sep 19, 2026 · Methodology

How it compares with other 54,000 Btu heat pumps

4.5-ton central models

This pairing at 5°F: 44,000 Btu/h
This unit at 5°F median across its pairings: 44,000 Btu/h
Median of 4.5-ton central models at 5°F: 40,000 Btu/h
Models in this group: 343

This unit is above 64% of them, at number 123 of 343 by heat at 5°F. The middle half of the group runs 32,000 to 45,000 Btu/h.

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

Closest models by heat at 5°F

Every 54,000 Btu (4.5-ton) unit, ranked by cooling efficiency, then heating efficiency

Certified values for KUSXB601A

7 pairings · 7 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.

Certified values for KUSXB601A
Heating
	This pairing	All pairings
Heat output at 47°F normal speed	56,000 Btu/h	50,000–56,500 Btu/h
Heat output at 17°F full speed	36,400 Btu/h	32,000–36,400 Btu/h
Heat output at 5°F full speed	44,000 Btu/h	41,000–45,000 Btu/h
Heat output below 5°F	NR	NR
Cold output 5°F output as a % of the 47°F rating	79%	78–82% of its 47°F rating. Tests use different compressor speeds.
COP at 5°F full speed	1.80	1.80–2.00
HSPF2 Region IV	8.5	8.5–9.4
Cooling
Cooling capacity at 95°F full-load test	52,500 Btu/h	45,500–52,500 Btu/h
EER2 at 95°F	10.5	10.5–12.0
SEER2 cooling season	15.2	15.2–17.5
Cooling at other temperatures	NR	NR
Equipment and listing
Refrigerant	R-32
Compressor	Variable speed
Indoor unit	LKMMA60C1	4 indoor units
Furnace	No furnace	2 furnaces
Cold-climate designation EPA's designation, as published	Yes	On every pairing
ENERGY STAR Most Efficient EPA's designation, as published	No	On some pairings
Where it is sold	US and Canada	US and Canada
Model string as certified	KUSXB601A

Pairings, by indoor-unit class

4 indoor units · 7 certified pairings

One row per indoor unit certified with this outdoor unit.

Air handler · 4 indoor units

KNSLB601A LG 45,000 Btu/hat 5°F, full speed

2 pairings · 47°F 56,500 Btu/h · 95°F cooling 52,500 Btu/h · Cold output 80% · COP 1.85
LKMMA60C1 (the pairing on screen) brand not stated 43,000 Btu/hat 5°F, full speed

2 pairings, 1 with a furnace · 47°F 55,000 Btu/h · 95°F cooling 52,250 Btu/h · Cold output 78% · COP 1.85
LKMMA60D1 brand not stated 43,500 Btu/hat 5°F, full speed

2 pairings, 1 with a furnace · 47°F 55,500 Btu/h · 95°F cooling 52,250 Btu/h · Cold output 78% · COP 1.90
LKMMA48C1 brand not stated 41,000 Btu/hat 5°F, full speed

1 pairing · 47°F 50,000 Btu/h · 95°F cooling 45,500 Btu/h · Cold output 82% · 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
KNSLB601A	LG	45,000	56,500	52,500	80%	1.85	Yes	2
LKMMA60C1 (the pairing on screen)	—	43,000	55,000	52,250	78%	1.85	Yes	2
LKMMA60D1	—	43,500	55,500	52,250	78%	1.90	Yes	2
LKMMA48C1	—	41,000	50,000	45,500	82%	1.80	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

LG7 pairings

Model number as listed

KUSXB601A 7 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

KUSXB601A first appeared in the certified data between September 2024 and November 2024.

History and definitions

History

First certified record: Mar 31, 2025
Most recent certified record: Apr 22, 2026
Measurements reported: Mar 31, 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, “KUSXB601A — certified heat output”. Certified figures dated Sep 19, 2026, checked daily.
https://heatpumplist.com/model/kusxb601a

KUSXB601A

Certified heating and cooling

Heating and cooling by outdoor temperature

Rebates where you live

Certified output and power use#

Power use at each temperature

How it compares with other 54,000 Btu heat pumps#

Closest models by heat at 5°F

Certified values for KUSXB601A#

Pairings, by indoor-unit class#