![]() ![]() ![]() ![]() The Ultimate Energy Window ![]() What are Window Energy Ratings?
![]() ![]() ![]() ![]() Air losses (Negative)
Inside
Warm air leaks out through the window Solar heat interior
Solar heat from outside
Outside
Solar heat gain (Positive)
Outside
Inside
Solar heat is reflected, absorbed and transmitted
Solar heat is reflected, absorbed and transmitted
Thermal losses (Negative)
Outside
Inside
Thermal losses from convection, conduction and radiation
Radiation
Thermal losses from convection, conduction and radiation
Convection
Conduction
Conduction
The Window Energy Ratings were developed by the British Fenestration Ratings Council (BFRC). The main benefit for consumers is that it allows them to compare the energy efficiency of different products with ease. It uses the already recognisable format of the A to G scale found on fridges, freezers, washing machines etc. Because the Government are committed to reduce the levels of carbon dioxide emissions, and as window heat loss can account for up to 30 per cent of the total heat loss from a house, replacement windows are now energy rated. This will help to reduce harmful CO2 emissions and help cut the cost of heating bills.
Based on the results, windows are then rated from A to G with
How is a window energy rated?
1) Solar heat gain ![]() |