# IEQ 3.1 Thermal comfort - Double Glazing
# Applies to
Single dwellings, extensions and Multi-dwelling (dual occupancy, townhouse, villa unit etc)
# Objective
To provide comfortable indoor spaces and reduce energy needed for heating and cooling
# Summary
Points are awarded where double glazing (or better) is used for all habitable room windows.
# Documentation & evidence required
- Reference to floor plans or energy modelling showing the glazing specification (U-value and Solar Heat Gain Coefficient, SHGC)
# Other Considerations
Consider the window frame as well as the glass type. 'Thermally broken' window frames (available in timber or aluminium) reduce heat transfer through the frame itself.
A preliminary building energy rating (NatHERS / FirstRate5 assessment) will help you optimise your design for passive heating and cooling.