Well first off what were they eating before you got them and how old / large are they.

Ball pythons need some time to get adjusted generally I try not to mess with them for 7 day and will offer food if they seem interested if they don't I'll not offer and wait 7 more days and see what they are doing at that point. Personally all the snakes I have had all have eaten in 14 days from arrival.

Your cool side is a bit low what is the air temp?

Are you taking temps under the hides or else where?