No, there is currently no air conditioning at the Psychedelic Loft in Schiedam.
The space is a deep, spacious historic building on the ground floor with limited glass and another floor above, so it tends to stay relatively cool when sun shades are used and doors remain closed. On a recent 38°C day, it was about 26°C inside with a brief peak near 28°C.
Extra fans are added on very hot days, and those who need more relief can use cooling pads, ice, frozen towels, or cold treats. Sessions and ceremonies generally continue even in heat up to around 40°C; for the latest practical details, see this brief update. Hope this helps.