what's the easiest way to get the Heating Degree Days, relative to a 17° base temperature., as Thermos requests it?
If i understand it correctly, eurostat uses 18°C as base temperature.
And at the great tool of the german IWU you can only select 15,12 or 10°C.
Maybe you can provide a hint?
(And put this hint also directly in the user-interface where you have to enter it...)