heat loss, payback time and density

Question 1

how is heat lost from our houses?

Answer 1

• floor
• roof
• windows
• walls

Question 2

what are the ways to insulate the home?

Answer 2

• double glazed windows
• loft insulation
• draft proof doors

Question 3

what is the payback time?

Answer 3

payback time of an object is how long it takes for the object to pay for itself

Question 4

how to calculate the payback time?

Answer 4

installation cost divided by the annual saving