Once you get the first set of true leaves you no longer need the dome. The idea of the dome for seedlings and clones is to raise the RH level above normal so the light will not burn the leaf from the inside out. I.E. dry out the leaf.

I quit using domes for clones a few years ago I found that the anti-wilt spray works so much better then a dome. The temperature you are talking about is the soil temperature not really the room temperature. The soil should be warm not hot. The ideal temperature is 70-75° f for the most chemical activity and to hasten nutrient uptake. Soil temperatures above 75°f can dry out roots and kill them. It takes several weeks for the roots to grow back so watch the temperature.