
The Dr. Klein Society has compiled the following comparison of heating costs in old buildings, new buildings, and passive houses, each with a living space of 120 m²:
| Heating oil requirement/year & m² | Heating costs/year | |
| Old building (uninsulated) | 20 liters | €2,160 |
| New building (energy-saving house) | 4 to 8 liters | €432 to €864 |
| Passive house | 1.2 to 1.5 liters | €130 to €162 |
PS: This is only an example, as the Explorer Hotels do not heat with heating oil, but with biogas, district heating, solar panels, or wood pellets. 😉
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