If you have a basement or room that naturally stays cool, along with the option to move your dry room there, I recommend doing it. You're looking for 60°F and 60% relative humidity throughout your dry, as optimal setups are concerned. Since you can't reach that temperature, you can at least reach that relative humidity in the room.
78°F and 60% relative humidity will give you a quick dry, but, it should turn out fine. You won't lose very many terpenes due to higher heat and they will still have a chance to cure well after you dry.
As far as solutions go, you could get some fans and keep air circulating all the time. Just make sure you don't hit your plants/buds with any direct gusts from any of your fans. Try to keep a fan up high,pointed towards the base of the branches/plants, and have the other fan focused on moving air from between he floor and the tops of the plants while they are hanging. Good airflow will go a long way.
I hope this helps. Good luck!