Floor temp when setting tile

[cvap]

I am setting some tile on a heated slab in a poorly insulated sunroom. To keep it above 10 in the room the floor must be at least 22.
At what temp should I worry about the adhesive drying too fast?
I have done it in hot weather but usually it's humid too.

Also, getting frustrated with a Versailles pattern of four different sizes. Three 20's with a joint adds up to more than one 60. Still learning.

 

[DHTiling]

The heating must be off. If left on , it is classed as kinda force drying the adhesive and the comps void any warranty.

Use another source and heating to heat air temp of the room to keep it to 5 dgs cel minimum.