Case study 02 – Monitoring heating costs
This hempcrete house is yet another example of energy efficiency. The figures prove it.
Located in the Haute-Garonne department, the house was designed with an environmentally friendly approach in mind:
- Natural insulation with Tradical® Hempcrete insulating walls
(R = 3.5 m²K/W for a thickness of 30 cm) - A Tradical® Hempcrete insulating roof
(R = 5 m²K/W for a thickness of 30 cm) - Masonry stove
- Solar DHW
Completed in 2011, the house has provided us with a precise snapshot of energy consumption. Note that for all hempcrete constructions, heating energy consumption is higher during the first year of use before becoming more stable in the following years, as the table below shows.
| Outcome per year | Year 1 | Year 2 | Year 3 |
| Wood consumption | 2 steres of logs + 2 m3 of chestnut | 1.5 steres of logs + 2 m3 of chestnut | 2 steres of wood |
| Energy performance | 57 kWh/m²/year | 50 KWh/m²/year | 30 kWh/m²/year |
| Heating costs | 250 € | 200 € | 150 € |
Overall energy performance
The outcome is 50 kWh/m²/year, taking account of DHW and ancillaries in particular
Energy consumption byIC2E
Temperature readings show good indoor thermal comfort in winter and summer.
- In winter: 22/23°C indoors in the daytime when outdoors it is 0°C at night and 9°C during the day
- In summer: 25/26°C indoors in the daytime when outdoors it is 15°C at night and 30°C during the day
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