Cabin/Cockpit temperature has always been a 525 series issue, and more recently flying the CJ2+, it appears to help matters considerably by opening all the cabin vents fully open and ensuring that no jackets etc. are located on the rear hangers in front of the aft flood - at least we don't seem to freeze like we did before lol......oh, and if you carry soft, furry blankets etc., they seem to shed fibres that can build up in ducting etc. which may cause issues relating to temp. control (i think!).
F/o