LG / AIR-SOURCE HEAT PUMP
KUSXB421A
KUSXB421A · EPA record 4029081
Source checked Sep 21, 2026
Performance & equipment details
Values below belong to EPA record 4029081. Temperature points and test metrics are preserved as reported. Missing and zero values are not substituted with estimates.
| Metric or attribute | Source value |
|---|---|
| SEER2 · BTU/Wh | 17.20 |
| EER2 · BTU/Wh | 11.00 |
| HSPF2 · BTU/Wh | 9.50 |
| Cooling capacity · BTU/h | 41000 |
| Heating capacity at 47°F / 8.3°C · BTU/h | 44000 |
| Heating capacity at 17°F / −8.3°C · BTU/h | 29000 |
| Heating capacity at 5°F / −15°C · BTU/h | 37000 |
| COP at 5°F / −15°C | 1.80 |
| Equipment / loop type | HP - Split System |
| Refrigerant / source-reported GWP | R-32 (GWP:675 | Lower GWP) |
| Compressor staging | Continuously variable |
| Connected capability | No |
This listed system
These ratings apply to the listed configuration. Changing a component may change performance.
Outdoor unit
+KUSXB421AIndoor unit
+LKMMA42C1Required furnace
LNA**100C1AHRI reference 217284966 · reported by ENERGY STAR; no direct AHRI data connection.
All source records for KUSXB421A →Specifications & provenance
Every value below is preserved from the source record. Checked Sep 21, 2026. Asterisks and other model wildcards are retained as published.
| Source field | Reported value | Evidence |
|---|---|---|
| pd id | 4029081 | EPA Sep 21, 2026 |
| markets | United States, Canada | EPA Sep 21, 2026 |
| cop at 5 f | 1.80 | EPA Sep 21, 2026 |
| eer2 btu wh | 11.00 | EPA Sep 21, 2026 |
| series name | KUSXB421A | EPA Sep 21, 2026 |
| cold climate | Yes | EPA Sep 21, 2026 |
| hspf2 btu wh | 9.50 | EPA Sep 21, 2026 |
| model number | KUSXB421A | EPA Sep 21, 2026 |
| product type | HP - Split System | EPA Sep 21, 2026 |
| seer2 btu wh | 17.20 | EPA Sep 21, 2026 |
| date certified | 2026-04-22T00:00:00.000 | EPA Sep 21, 2026 |
| manufacturer type | System Manufacturer | EPA Sep 21, 2026 |
| compressor staging | Continuously variable | EPA Sep 21, 2026 |
| energy star partner | LG Electronics, Inc. | EPA Sep 21, 2026 |
| connected capability | No | EPA Sep 21, 2026 |
| furnace model number | LNA**100C1 | EPA Sep 21, 2026 |
| refrigerant with gwp | R-32 (GWP:675 | Lower GWP) | EPA Sep 21, 2026 |
| ahri reference number | 217284966 | EPA Sep 21, 2026 |
| cooling capacity btu h | 41000 | EPA Sep 21, 2026 |
| outdoor unit brand name | LG | EPA Sep 21, 2026 |
| date available on market | 2026-04-15T00:00:00.000 | EPA Sep 21, 2026 |
| indoor unit model number | LKMMA42C1 | EPA Sep 21, 2026 |
| energy star model identifier | ES_1118034_KUSXB421A_05012025013120_28217284966 | EPA Sep 21, 2026 |
| heating capacity at 5 f btu h | 37000 | EPA Sep 21, 2026 |
| meets most efficient criteria | Yes | EPA Sep 21, 2026 |
| heating capacity at 17 f btu h | 29000 | EPA Sep 21, 2026 |
| heating capacity at 47 f btu h | 44000 | EPA Sep 21, 2026 |
| meets peak cooling requirements | Yes | EPA Sep 21, 2026 |
| controls verification procedure cvp test | ENERGY STAR CVP Test | EPA Sep 21, 2026 |