Wooden floor, insulation or not?

[Slottsfrun]

My reasoning about the trossbotten was just reasoning. Finding a good craftsman today is difficult. Try with 22 degrees and knock on the boards underneath tomorrow. Good luck!

Thank you so much for all the good advice and the time you've spent helping me. ❤️

 

[kenth gustafsson]

my cabin stands on blocks so in the summer I can check underneath...
had to dig a hole in front of the cabin in the summer and put a submersible
pump there since the ground didn't absorb 91mm in 3 days (near a stream and old
forest land)...the AMU cabin was built in the 70s for educational purposes in the carpentry
line at certain AMU centers, hence the name.

 

[Himmelsfararen]

my cabin is on blocks, so in the summer I can check underneath...
had to dig a hole in front of the cabin last summer and put a submersible
pump there as the ground didn't absorb 91mm in 3 days (near a river and old
forest land)...the AMU cabin was built in the '70s for educational purposes on the carpentry
line at some AMU centers, hence the name.

Ah, do you have a moisture meter so you can check the value? Very difficult to advise on what you should do, but building over/around something has never seemed good to me.

 

[Oldboy]

If it were an uninsulated floor and the air source heat pump is set to
+18. How cold do you think the floor would be then, considering it's currently -20 degrees outside…

Around zero.
+18C on the top side and -20C on the underside gives -1C on average. Then there are many different factors that affect it, so that value can be a few degrees up or down.

What temperature do you think I should set the heat pump to?

It depends on... many things.
Attefallshus. To me, that might mean it functions as a guest house and is therefore inhabited for one or a few weeks/year. In that case, I would keep it at 12-15C normally and turn up the heat when it's occupied. What temperature is suitable depends on what the person/people staying there feels comfortable with, and also perhaps whether it's only used for sleeping and not daily living. In that case, the temperature can be slightly lower.
Primarily, I see it as an economic issue.

If I were using it as a home office (sedentary work), I would want it at 23C to avoid freezing.

Regarding floor temperature, it depends on how much insulation there is, but since it's a newer Attefall build, the insulation thickness should be relatively okay. Given that it's on stilts, it has outdoor air temperature on the underside, which makes the floor cold when it's cold outside. If it were a crawl space or slab on ground, the temperature on the underside of the floor wouldn't be as cold as the outdoor air, and thus the floor wouldn't be as cold.

I'm assuming the temperature readings are measured with a thermometer? What the heat pump control says is irrelevant.