Growing on toms mostly

I am running out of room in the conservatory, which is very warm, having done too many toms.  I have space in the porch.   I was wondering once the toms are 5" high would they be ok in the cooler porch, there is a rad in there but its on very low.  How much heat do they need once that high, if any.

Thanks
Sheila

oh yeah no frost in there.  Right I'm gonna do that then with some of them, I've got so many I can risk it.  In a couple of weeks I will put some in the wendy house as well ............ermm! I mean the inherited pointless  summer house.