Realistic cost estimate: Single-family house with unfavorable development location

Why do you constantly try to present nonsense as correct, although you obviously have no idea? No one installs insulation in the intermediate ceiling.

Radiant heat??? Infrared heaters (or the sun) work with radiant heat, but certainly no underfloor heating... you really have no clue at all?

For us, it’s not just 3 degrees in winter. The living room is cozily liked by the lady of the house at 23-24 degrees, and the bedroom can sometimes be as cold as 12 degrees in the harsh winter. And since heat rises, insulation surely makes sense, doesn’t it? Above all, it will be a wooden beam ceiling, not an "insulating" concrete ceiling.

If the bedroom is sometimes as cold as 12°C in the harsh winter, don’t you especially need the extra heat from the living room? Anything below 16°C increases the risk of mold to an enormous degree?

Axo... by the way, thermal radiation. Certainly, warm bodies emit a certain heat flux. However, this scales with the fourth power of the temperature and plays absolutely no role in underfloor heating, which at the floor surface reaches at best 30°C. Such a thing is interesting in the steel mill when the poor worker stands in front of a white-hot piece of steel at 1,300°C.

No one installs insulation in the suspended ceiling.

Take a look at your building specifications. Floating screed is standard, even in houses without underfloor heating. In houses with it, it is all the more standard.

Why do you keep trying to present nonsense as correct, although you obviously have no idea? Nobody installs insulation in the intermediate ceiling.

Radiant heat??? Infrared heaters (or the sun) work with radiant heat, but certainly no underfloor heating... you really have no clue at all?

Wait!

It is correct that the heating output for the entire house does not depend on insulation in intermediate ceilings. In that respect, you are right.

But it is also correct that we want to transport heat to specific locations in houses. An underfloor heating system should heat the floor as efficiently as possible. If so, then heat transfer to the ceiling of the floor below must be minimized. Simply because the heating can be set more evenly; otherwise, you would need more power upstairs and less downstairs for the desired temperature distribution.

Otherwise, a correction regarding radiant heat: All surfaces with a temperature above zero emit thermal radiation. This is not an exclusive concept of any heating system. This part is therefore part of the heating concept for all heating systems – regardless of which one it is. However, the radiant power roughly increases with the fourth power of the temperature, so it is less important the lower the "radiators" are heated.

Maybe just reflect on your own expertise before shouting "nonsense."

Hi everyone, After the heated discussion, here is a comment from us again. We have meetings this week with our financial advisor and the construction company. What questions would you find important to include? We are now pretty much at the signing stage with both. KfW40 is underway, the energy consultant is satisfied. Any pitfalls that should definitely be considered? Mistakes you have painfully learned from?