Before contacting a company about your environmental test chamber needs you should first determine the maximum size you want and available space where the chamber will be located.

Also determine if the proper power source and operating voltage and FLA of your chamber is available.

For air cooled chambers the temperature of the lab in which the chamber is operated can not exceed 80F.

Humidity chambers usually require a water source and a method of draining condensation from the chamber.
Water for test chamber should always be treated water. If you only have city water available, make sure you add a demineralizer system.