Unless a temperature below 70 F. can be constantly maintained then there really is no point attempting to keep them as they will simply die. Heat stress is a well documented fatality in these and many other plethodontid salamanders. Temperature governs reproductive, feeding and hibernation behaviour. In the wild these salamanders are able to move deep underground to escape heat. In captivity they do have such opportunities.
Humidity is also important.
As ensatina are plethodontid or lungless salamanders, the exchange of oxygen and waste gases through the skin demands a moist environment. DO NOT close off ventilation points to increase humidity. Always ensure there is excellent ventilation. The water pan contents must be changed on a daily to two day basis. Food for these salamanders consists mainly of insects, preferably centipedes, spiders and small crickets.