The entire process takes place in near-freezing conditions and such plants are usually built with large amounts of flammable foam insulation to maintain a constanttemperature.
Rather, the system takes advantage of the fact that the earth underneath Fort Knox (like many places across the country) maintains a more or less constanttemperature of 57 degrees year around.
You're just a piece of aluminium coated in some sort of magnetic substance in a server farm located in a country where the climate makes it economically viable to keep the machines at constanttemperature.
Inside the greenhouse, lines of bright sodium lights shine down on the growing tomato plants, and the temperature remains a constant, warm 23C -- even in the depths of winter when outside temperatures drop well below freezing.
Besides being sited amid a beautiful setting with a view of the stage and the sound of rushing water, the spring also remains a constant 106.7 degrees Fahrenheit because the staff is always checking the temperature and adjusting the amount of water entering the spring.
Unlike large glass mirrors which are subject to the vagaries of humidity, thermal dynamics and constant deformation from gravity itself, liquid mercury which remains molten at room temperature can reflect as much as 75 percent of incoming starlight with little of the fuss associated with large conventional mirrors.