1. Thermal Loss (U-window): measures heat that is lost through the overall window - energy efficient windows reduce heat loss, therefore a lower u-window value means better energy efficiency.
2. Heat Gain (G-window): measures the amount of heat that is absorbed from the sun - energy efficient windows transmit solar heat back into the room, helping to lower home-heating usage.
3. Air Leakage/Loss (L-factor): measures heat loss that occurs as a result of general air leakage - an energy efficient frame and glass will help reduce air leakage.

Single and old double glazing results in major heat loss within the home. Upgrading to energy efficient windows will greatly reduce heat loss, keeping your home warmer and reducing CO emissions.

Energy Rated Windows has been designed to minimise heat loss, absorb heat from the sun and eliminate air leakage... the result is savings on home heating bills and reduced energy waste.

1. Save money on your home heating bills... your heating bills could be reduced by up to 20% per year.
2. The Environment... energy efficient windows will help ensure you do “your bit” for the
   environment and could reduce your CO emissions by up to two tonnes.
3. Current building regulations... energy efficient windows adhere to currently building
   regulations for new build properties and houses for sale or rent. If you are selling your home, energy rated windows could help add to the overall value of the property.