If it stayed 88 and nothing lower than you would be perfectly fine with out adding heat.
Personally i wouldn't trust it considering boiler rooms get hotter the more their worked and cooler the less. Best off using a space heater with a thermostat to control the room better.
Last time Tracy was on Reptile Radio I think she said it was 80... with hotspots of 90 for the gravid females. I keep my juveniles and adult males at an ambient of 83 with no hot spot and no problems.