GeoStar / GEOTHERMAL HEAT PUMP
G5SZ036BD1
ASTON · EPA record 4518618
Source checked Sep 21, 2026
Performance & equipment details
Values below belong to EPA record 4518618. Temperature points and test metrics are preserved as reported. Missing and zero values are not substituted with estimates.
| Metric or attribute | Source value |
|---|---|
| Heating COP | 4.4 |
| Cooling EER · BTU/Wh | 23.8 |
| Equipment / loop type | Closed Loop Water-to-Air |
| Refrigerant | Other |
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 | 4518618 | EPA Sep 21, 2026 |
| markets | United States, Canada | EPA Sep 21, 2026 |
| brand name | GeoStar | EPA Sep 21, 2026 |
| cop rating | 4.4 | EPA Sep 21, 2026 |
| eer rating | 23.8 | EPA Sep 21, 2026 |
| model name | ASTON | EPA Sep 21, 2026 |
| model number | G5SZ036BD1 | EPA Sep 21, 2026 |
| product type | Closed Loop Water-to-Air | EPA Sep 21, 2026 |
| date qualified | 2026-01-15T00:00:00.000 | EPA Sep 21, 2026 |
| refrigerant type | Other | EPA Sep 21, 2026 |
| energy star partner | WaterFurnace International, Incorporated | EPA Sep 21, 2026 |
| date available on market | 2025-01-02T00:00:00.000 | EPA Sep 21, 2026 |
| energy star model identifier | ES_1036337_G5SZ036BD1_01182025003242_01216759832 | EPA Sep 21, 2026 |
| meets most efficient criteria | Yes | EPA Sep 21, 2026 |