The year when the property's main heating system was installed.
This date helps determine the age of the heating equipment, which can indicate its efficiency and how soon replacement might be needed.
| Median | Mean | Mode |
|---|---|---|
2019 | 2017.221 | 2020 |
| Location | Median | Mean | Mode |
|---|---|---|---|
| Unknown | 2019 | 2017.221 | 2020 |