You can no chill in the fermenter, I actually used to do that when I lived in the UK, ambient of 9 degrees during half of the year will do it nicely
However you need a truly sanitised fermenter, cling wrap it and refrigerate it when it gets down around 40 degrees and be ready to pitch immediately it gets to 22 degrees or thereabouts.
You should be lucky nine times out of ten.
The benefit of no chilling in the cube is peace of mind and not being forced to pitch. I've got a couple of cubes I filled last Friday, still havent pitched. They are actually sitting in the fridge at 3 degrees just as an extra insurance policy.