How to Keep a Constant Temperature in a Container
Storing temperature-sensitive items in a container can pose temperature control dilemnas. Many containers will not maintain an internal temperature with environmental fluctuations from hot to cold. For food storage, this could mean bacterial growth and spoiling, while for plants this could mean total loss. Hope is not lost, as there are several products that will help you maintain constant temperatures in almost any container.
Purchase thermal containers for your items to protect them from temperature changes. Thermal containers are made of insulated materials that trap cool or warm temperatures within the container itself.
Store your container in a temperature-controlled environment, such as the refrigerator or a warm, dry room until ready for use. The air outside of your container will determine the temperature level inside; therefore, avoid environmental changes in temperature unless absolutely necessary.
Place insulated inserts into your containers to keep temperature constant. These are called "TCP" inserts and are primarily used in shipping food products and other sensitive materials. TCP inserts are available through shipping supply stores.
Store or transport containers in an insulated foam or plastic cooler. Coolers are used to keep beverages and food cold, but also have the ability to keep internal container temperatures constant for other items.