Here is my problem with "Diamonds are a cool climate python" crap.
I live in an area which has arguably Australia's best diamonds and I can tell you during summer it's not uncommon for the temperatures to reach 45 degrees with around 30 degrees being the cooler days especially since I live on a "mountain" which has absolutely no coverage from buildings or vegetation to soften the rays.
It seems a lot of people think that diamonds bask for 4 hours and then sit out in the open for the other 20 hours of the day when in fact they thermoregulate all day long during winter nights in rock crevices which have been heated by the days sun.
Why people continue to offer ridiculous cooling times and temperatures amazes me, no diamond python is out there limiting themselves to 4-6 short hours of heat and nothing else, nowhere in their range does this occur naturally. The idea is to cool them...not freeze them. Cooling can be achieved even with 24 hour heating, primary heat source being on for 4-8 hours depending on season and then having a small heat mat or cord which is timed to come on right after the primary heat source goes out which is heated to between 14-16 degrees.
I have a fair few diamonds and this is the way I have kept them for over 10 years, they have bred successfully every time I have paired them using this method and have never had a single problem with sickness, DPS or feeding.
Diamonds are one of the most fool proof snakes you can own yet people are always having problems with them, that is due to inaccurate husbandry.