Lennox EL21KLV-036-230A**vsTempstar R4H5S36*K*AAA*
Side-by-side heat pump comparison
Lennox EL21KLV-036-230A**
SEER2
15.2–20BTU/Wh
HSPF2
8.5–10.4BTU/Wh
Cooling Capacity
32000–34800BTU/hr
Cold Climate
Yes
Cold climate certified
Tempstar R4H5S36*K*AAA*
SEER2
15.5BTU/Wh
HSPF2
7.8BTU/Wh
Cooling Capacity
34600BTU/hr
Refrigerant
R-410A
GWP 2088 · Higher
Key differences
Lennox EL21KLV-036-230A** is 23% more efficient at 20.0 BTU/Wh versus 15.5 BTU/Wh for the Tempstar R4H5S36*K*AAA*. The Lennox EL21KLV-036-230A** is larger at 34800 BTU/hr versus 34600 BTU/hr. Lennox EL21KLV-036-230A** uses a lower-impact refrigerant: R-454B (GWP 470) versus R-410A (GWP 2088). Overall, the Lennox EL21KLV-036-230A** sits higher in the category, ranking above 68% of certified air-source heat pumps.
Efficiency
| Spec | Lennox | Tempstar |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 20 | 15.5 |
| SEER2 (worst combination)(BTU/Wh) | 15.2 | 15.5 |
| HSPF2 (best combination)(BTU/Wh) | 10.4 | 7.8 |
| HSPF2 (worst combination)(BTU/Wh) | 8.5 | 7.8 |
| EER2 (best combination)(BTU/Wh) | 12.2 | 12.5 |
| COP at 5 °F | 2.48 | — |
Capacity
| Spec | Lennox | Tempstar |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 34800 | 34600 |
| Cooling Capacity (min)(BTU/hr) | 32000 | 34600 |
| Heating at 47 °F(BTU/hr) | 35400 | 33800 |
| Heating at 17 °F(BTU/hr) | 31800 | 20200 |
| Heating at 5 °F(BTU/hr) | 25400 | — |
Configuration
| Spec | Lennox | Tempstar |
|---|---|---|
| Product Type | HP - Split System | HP - Split System |
| Compressor Staging | Continuously variable | Single stage |
| Cold Climate Certified | Yes | No |
| Connected Capability | No | No |
| Series | Elite EL21KLV SERIES | 15 SEER2 R SERIES R410A HP |
| Indoor-Unit Combinations Rated | 272 | 1 |
Refrigerant
| Spec | Lennox | Tempstar |
|---|---|---|
| Type | R-454B | R-410A |
| GWP Rating | R-454B (GWP:470 | Lower GWP) | R-410A (GWP:2088) |