Treat yourself to the new benchmark of residential window 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 which is on another level.

This is partially due to the innovation in Aluminium joinery known as ‘thermally broken’ where the Aluminium window or door is made up of 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 sliding windows, awning windows, and fixed windows.


ThermaLine Door Range

Our ThermaLine Aluminium Door Range includes sliding doors, sliding stacking doors, and corner sliding doors.


Need more information on our ThermaLine range?

Contact your local Dowell office today!