argon-filled windows 4

https://storylatticex.com/s/kN5X55MVNuTCqdxsmotUb

Argon-filled windows have an invisible layer of dense gas sandwiched between the panes, which does a surprisingly good job at slowing down heat transfer. It's a common upgrade in energy-efficient homes, making rooms feel more comfortable near the glass without that drafty chill in winter or excess heat in summer.