I have a sunroom 100sq' in area that isn't heated. Temps here in Virginia can get down to 32F. The question is, should I wait until spring to tile or what are the tricks for tiling in cold weather....type grout, thin set, durock or hardibacker what about the effects of cold and hot weather on the flexing? The present floor is tongue and groove wood underfloor is plywood.
thinset is a type of cement. Cement is comfortable when you are. (50 F to 70 F) So I would recommend you wait. You can add anti-hydro and cover with insulated blankets if you have to. this will allow you to work down to temps of 20F.