Some people say use UTHs, or flexwatt.
Some people say use CHEs or heat bulbs.
Some people say use RHPs.

Take a moment and ask yourself.. why do all these people use different heat sources and seem to have success? You'll probably come to the only logical conclusion I did:

They all work well.

I use Flexwatt on my 4x2s for adults.. however when I need to add more 4x2 cages, I've decided to redo my entire adult caging, sell what I have now, and purchase a stack or two and get RHPs installed in all of them.

For my juvies, put together naturalistic planted vivariums for 'em. It was a fun project to put together display cages. However, they are screen-topped glass exo-terras, and the best way I found to provide heat is with CHEs.

Any hatchlings of any snake species I produce will be in racks heated with flexwatt.

I don't know what heat sources are available to you in South Africa, I know that it may be different from here in the US. If you're having issues, as long as your winter indoor temperatures stay above 70, you can even just use a heat bulb (lightbulb designed to provide light and heat with a reflector dome). Have it on during daylight hours, off at night. Provide more hours in your summers and fewer hours in your winters This is a good option that, if indoor temperatures fluctuate similarly to your seasons, will help your pythons seasonally cycle.