Thanks Sam, my minimal physics did though at least include the concept of quanta. So back to my still-unanswered questions :-
Q1: So given multiple energy levels then, is it possible for the highest level electron in a cool body, to be at a higher level than the lowest level electron in a warm body?
Yes/No
Q2: If not, why not?
Q3: If yes, is it then not possible for a photon to go from a cool body to a warm one ?