U.S. patent application 20180252466 (applicant Caron Products and Services Inc., Marietta, Georgia):
"An insulated chamber having an interior region for storing items therein includes a phase change material to facilitate controlling the temperature of the interior region and the items. A heating device or cooling device may be used to melt or freeze the phase change material. The phase change material (PCM) may be in various locations such as the walls of the chamber in the form of packets or in the form of containers that serve as shelves and may be removable from the interior region. The packets may have recesses for receiving the items. The phase change material may be within capsules that may be within a liquid or a solid matrix. Controls may be provided to control humidity, oxygen, and carbon dioxide within the interior chamber."