I'll chime in here. Today we had the sampling for tiles (easy, went quickly) and floors (long and exhausting). Originally, we had planned to go with glued vinyl because...the usual reasons...durable, good conductivity, and not so expensive. Then the salesperson started saying that it might be sensitive to heat from strong sunlight...and then my girlfriend remembered that vinyl is plastic and actually not so great...and then it went back and forth...I definitely don’t want tiles that look like tiles in the living room, and tiles with a wood look are already about 100€, so you might as well just get parquet... Now we are kind of completely open in that regard. As planned, with vinyl and Vinylan Edelkastanie for a good 40€ or Kährs Eiche Domo for around a hundred and possibly an extra charge for installation. It's quite rustic and maybe should be able to handle it if the little one drives the ride-on car through the Duplo pile. For me, the heating/cooling issue is still a bit open. Vinyl conducts well, so no problem. Underfloor heating with glued parquet is probably slow but still okay. But what about underfloor cooling?