How do you insulate cellar?

a room wholly or partly underground that is not suitable as living space and is usually used for storage

The Cellar Saver is a simple device that attaches to the vertical flow-pipe exiting the sumpwell from the sump pump and it's wired to a home security system. It has a swing-arm that rotates away from...

To keep warm..

An insulator is scientifically speaking a poor conductor therefor it will not readily transfer the heat out of the object in question. The heat then bounces back in the case of a body with a jacket...

If you mean by this question, "How do I stop the cold draft in the Winter I feel coming from the fireplace?", then I have an answer. Reach up into the chimney throat from inside the firebox and find...