Patent ID: 6988370

Claim:
A system for maintaining temperature in a space comprising: a first vessel having a first wall and an open end defining a first space, said first wall having a first void therein; a second vessel having a second wall and an open end defining a second space, said first wall having a first void therein, said first space configured for receiving the second vessel therein; a vacuum system including a vacuum source, said vacuum system in fluid communication with said first and second voids for creating a vacuum therein; first and second insulating covers adapted for releasably engaging the open ends of the respective first and second vessels; a volume of liquid refrigerant disposed in the second vessel; and at least one temperature control assembly disposed in the apparatus, the at least one temperature control assembly including an adjustable conductive element, a temperature sensor for generating a temperature value, a heater having an output, and a thermostatic controller, said temperature control assembly adjusting the output of said heater according to a difference between said temperature value and a reference value stored in the thermostatic controller.