Series 1 windows.

The benchmark, proven over 40 years.

Built for homeowners looking for a reliable, high-performing product with excellent value, the Series 1 has been the historical foundation of Isothermic for more than 40 years. It has been improved continuously to meet the demands of the Quebec climate.

It withstands winds of 124 km/h and was tested against 203 mm of rain in 20 minutes without infiltration. It is also recommended by Protégez-vous.

Available in PVC, hybrid or double hybrid, with double or triple glazing depending on the energy performance you are after.