Question text
18 A house is to be thermally insulated to reduce thermal energy loss and reduce fuel costs. loft insulation: installation cost, $300 energy cost saving, $300 per year cavity wall insulation: installation cost, $700 double glazing: energy cost saving, $200 per year installation cost, $7000 energy cost saving, $400 per year draught proofing: installation cost, $100 energy cost saving, $30 per year Which type of thermal insulation pays back the cost of installation in the shortest time? A cavity wall insulation B double glazing C draught proofing D loft insulation
18 A house is to be thermally insulated to reduce thermal energy loss and reduce fuel costs.
loft insulation:
installation cost, $300
energy cost saving, $300 per year
cavity wall insulation:
installation cost, $700
double glazing:
energy cost saving, $200 per year
installation cost, $7000
energy cost saving, $400 per year
draught proofing:
installation cost, $100
energy cost saving, $30 per year
Which type of thermal insulation pays back the cost of installation in the shortest time?
A cavity wall insulation
B double glazing
C draught proofing
D loft insulation
Select your answer: