Our Award winning, energy efficient, high performance...


Treat yourself to the new benchmark of residential windows and doors. Independently rated as the most energy-efficient windows and doors in its class and winner of the HIA Greensmart 'product of the year' award. Dowell ThermaLine® is our signature Future-Proof energy efficient product series.

Used in sustainable and modern net-zero-energy projects, ThermaLine® exudes comfort for the homeowner by regulating exterior weather extremes and resisting those elements (hot or cold) from coming inside. Giving your home a luxurious interior environment that is on another level.

Partially due to the innovation in Aluminium joinery known as ‘thermally broken’ where the Aluminium window or door, contains a minimum of two Aluminium parts (interior and exterior) and structurally married together by a Polyamide insulator.

A symbol of sophistication, Dowell ThermaLine® offers outstanding performance in all climatic conditions and assist in achieving energy rating of 7 stars or better.

See more, feel more and love your home even more with ThermaLine® from Dowell.


ThermaLine® Window Range

Our ThermaLine® aluminium window range includes the sliding windows, awning windows and fixed windows.


ThermaLine® Door Range

Our ThermaLine® aluminium door range includes the sliding doors, sliding stacking doors and corner sliding doors.


Need more information on our ThermaLine range?

Contact your local Dowell office today!