Winter Time Running say 6 QB's 600 H fixtures?

So assuming someone (a friend of mine) has a not greatly insulated licensed place in a legal state like say Colorado. They migrate from HPS to QBs. What temp should the room be at night? They may be running a propane CO2 burner.

Also HPS put real radiated heat into the plants plus the light photons. QB's don't put out to much heat. My mate Rackto might end up running 4 Qbs and 2 x 1000 watt HPS to keep the temps up in winter.

I am also asking for another friend who will be launching a licensed East Coast op may also be using QBs instead of HPS.

Thanks.