interesting all this discussion and the differences between "both sides of the atlantic"... I am currently also doing some research for GH heatings, and has been advice that gas should be avoided due to "negative effects" on the plants. Even though electricity should be the NO-NO-NO (due to heating costs) in most of Europe, it seems to be the most appropiate system to be used in France.
I have also been advice to build with a floor digged ca. 50 - 80 cm in the ground, as this would help to regulate temperature (kept above 0°C in winter, but cool in summer)
what i am not very sure yet, is whether the floor should be made out of concrete, or just the ground covered with gravel...
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