I incubate my veiled eggs at about 78F. I say "about" because the setup I have consists of a heating pad with a wood and screen frame over it. The frame is raised or lowered to get the right temp. in the container. This method makes the containers subject to small fluctuations in the temperature at night when the room cools. I have close to 100% hatch rate of fertile eggs and have done it this way for many many years. I have hatched various species of chameleon eggs using this method as well as several species of geckos, water dragons, coneheads, turtles, etc.