I have a 2-year-old P. brongersmai.
I am led to believe that warm end temperatures should be 85-90 F, cold end temperatures 79-81 F and RH 65%-75% (normal) and 80%-85% (during shed). I got this info from web searches, one of the best sites I found was http://beta.communities.co.uk/herpetoculture.co.uk/herpetoculturechatgroup/borneobloodpythons.msnw
I have two Under Tank Heaters (UTH) of 11W power. One is at one end of the enclosure under an 'Astroturf' mat, one is in the middle under a LARGE water bowl (swimming pool) and the remaining third is unheated. Apart from the Astroturf and pool the remainder is covered in orchid bark.
My house is at 300 ft elevation and I used psychrometric tables to calculate appropriate temperatures to give required humidities. The humidity is controlled by wet-bulb temperature and dry bulb temperature. The dry-bulb temperature is controlled by a Pro-Exotics thermostat fixed to the Astroturf over one of the UTHs. The wet-bulb temperature is controlled by a second P-E thermostat immersed in the swimming pool. At 300 ft elevation, wet-bulb (swimming pool) and dry-bulb (Astroturf) temperatures of 80 F and 88 F combine to give a relative humidity of 71%. -Within all required ranges for normal running. During shed the wet bulb temperature (swimming pool thermostat) is increased to 85 F, which increases the relative humidity to 88.6%.
A useful psychrometric calculator can be found at http://www.gpengineeringsoft.com/pages/pdtpsychrocalc.html
This works well unless the pool temperature is not raised from 80 F to 85 F during shed. This has happened twice (don't ask...)and both times caused a stuck shed (the skin on her back). On both occasions the stuck skin was shucked naturally within 24 h of increasing the temperature of the pool to 85 F. I have had no other health problems with this snake to date, she eats well and is very friendly.