argon filled windows 3

https://5gl3th6qp1.inkharbory.com/posts/what-to-know-before-a-vinyl-window-installation

Argon filled windows are a step up from standard double glazing, using an inert gas between the panes to improve insulation. This gas is denser than air, which slows down heat transfer, keeping your home warmer in winter and cooler in summer. They also help reduce condensation and outside noise, making for a more comfortable living space.