Temperature problems go with the territory for many PWPs. Peter, my husband, is very sensitive to cold, but also experiences "hot flashes" and cold sweats--the internal thermostat just won't stay adjusted! The best advice I can give your father is to try to "go with the flow", and see this as just another feature of the PD, rather than worry about it-- it's not abnormal and he's not alone in it. Getting stressed about it will only make thingsworse! :-( Hopethis helps-- Camilla Flintermann,CG for Peter,78/7,Ohio