His enclosure is 1800L x 1000W x 1000H (mm) with glass sliders on the front. It has 2 x 100W ceramic heat lamps both down the OTHER END, both on timers. I gave up on the thermostats because I couldn't get the temps right and found it easier to maintain temps with timers.
One heat lamp is only on from 5:00am to 10:00am to help raise the daytime temp, otherwise, with only 1 heat lamp the temp doesn't get up to 28-29C until about 2:00pm - using both heat lamps brings the temp up to 28C by 11:00am.
The hotter end is 32-34C with a basking spot at 40-43C.
Right, I should NOT have upped the temps in late November as I did - but his room doesn't get sun until mid afternoon so I thought he wouldn't know that it was time to wake up (back then the weather was unusually cold and his room was really quite cool). My mistake, won't do it again! I did just turn his lights on for the first few weeks.
I read that the temp for brumating juveniles should be around 24C which is why I kept it at that temp earlier. Now I know that next time I need to lower it to 15C. Hah, that'll be easy, it was rather difficult to keep it at around 24C in winter!
In fact this post has prompted me to question the temps now that Jimmi is older. Should I lower the temps now? 25C-26C at the cool end? I'll have another go with those thermostats but I found that the temps fluctuated a LOT using them.
And thanks guys for helping a n00b, much appreciated.