To heat or not to heat?

We’re heading into the cooler seasons in Ohio and this is my first fall/winter with the beetles. I have one enclosure of harlequin flower beetles, two Hercules larva and a stag beetle on the way (super excited for him). Do the beetles that hibernate need heat? I have zero clue about the larva also. Thanks for your advice! 

 
As long as temperature doesn't drop and stay consistent under 65˚F-ish, it is okay to leave them alone. If the temp drops under there, any adult with lifespan being longer than a year or larvae will likely hibernate. If you want to keep them as the way they like, you don't have to warm them up. If you keep them indoor, like in your room, living room, such places, no actions required. If you keep them outdoor, garage, or somewhere without insulation, a heating system may be necessary.

 
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