How can you minimize thermal energy transfer?

Simple ways to reduce heat loss include fitting carpets, curtains and draught excluders. It is even possible to fit reflective foil in the walls or on them. Heat loss through windows can be reduced by using double glazing. These special windows have air or a vacuum between two panes of glass.

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"