The Temperature of the grow room should be adjusted according to the types of plants you are raising. For example, summer vegetables and most flowers grow best between 60º and 80º F. Winter vegetables like spinach and lettuce prefer temperatures of between 50º and 70º.
Also, keep in mind that many crops prefer a lower temperature at night, often as much as 10º. Temperature is sometimes an easy basic to overlook. But if the temperatures in your grow room are either too low or too high, you’ll end up with abnormal development and reduced production.
(Courtesy of Advanced Nutrients)