Efficient heat transfer

Question 1

What does the rate at which thermal energy ie transferred through a wall of a house depend on?

Answer 1

1) The difference in temperature between the warmer interior and the colder exterior.
2) The thickness of the walls.
3) The material that the walls are made from.

Question 2

How can unwanted energy transfers be reduced?

Answer 2

Thermal insulation and lubrication.