Hey Thez,
Hmmm...sounds about right. In my conditions, the lowest temps my Heliamphora see are usually around 60F in Winter and 70F in Summer, on a 12 hr. photoperiod. I never allow temps to go higher than 78F, but then again they are all grown indoors. Mix is... I'd say around 80% live sphagnum to 20% perlite and only watered from above and allowed to slightly dry between waterings.
IMO, and in my conditions, H. sp. "Angasima" seems to grow best in more lowland/intermediate conditions, much like H. folliculata does.
Happy Growing,
Brian