you could put thick curtains up, have double glazing, loft insulation and draught excluders by doors
to protect you from the radiation of the sun and to help insulate you against heat loss
They are poor conductors
you could insulate around the immersion :)
The outer jacket on a fractionating column is used to insulate against heat loss from the inner jacket during distillation.
Depends upon what you wish to insulate against. Heat loss, high temperatures, electrical, ... . For electrical, plastics and rubber are common. For heat loss, foam polystyrene, or cotton cloth. For high temperatures, your choices are limited, for organic materials don't perform well here.
Water is the most important substance for maintaining body temperature.
Makes you heavier, cushions you, helps insulate you from heat loss, changes your body shape. Too much is bad for you
Insulate the conditioned area. Pay attention to all cracks use foaming insulation.
Seal around windows (caulk), weather strip doors and insulate the attic.
The only reason that I have heard of for insulating interior walls was for sound deadening efforts. There is no heat gain or loss advantage to insulating interior walls.
You can insulate the hot water pipes with spiral-wrap fiberglass insulation, foam tube insulation, or fiberglass pipe covers. These will all help reduce heat loss.
The Adipose Connective Tissue insulates against heat loss and provides reserve fuel.