Why use a CHE then? 77-78 is fine for an ambient temp. If you add a bit of insulation it might bump it a few more degrees. I use a deep blue led light beside the FL light. It adds a few degrees as well in the dead of winter I keep it on 24/7 it helps a faire bit. In the end you can always cut holes and add a che no problem but it might be worth an attempt at something less intrusive. Just a suggestion.