Thermally broken aluminium windows are designed to stop the transference of heat or cold. This is an important feature because up to 50% of heat transfer can be through your windows and doors. Thermal break insulation is to provide resistance to heat flow. Aluminium has a range of positive benefits, that’s why it is the material used for most window frames. Main advantage of installing those types of windows is the fact that you can see a difference in your electricity / gas bill.