Modern “energy efficient” low emissivity windows are a large problem for our health because they block out biologically important Near-Infrared (NIR) and Ultraviolet-A (UVA) light. It takes the full spectrum sunlight and distorts it to being very dominant in the visible wavelengths.

This is problematic, because low energy near-infrared light balances out the oxidative response in our cells when exposed to high energy visible (blue/violet) light. A large reason you feel so drained being inside all day is because there is little to no infrared light. We need more warmth, not less in our cold modern world.

Best Windows for Transmissivity : Low Iron Glass, Acrylic

Or just open your windows as much as possible for full spectrum light + negatively ionized fresh air 🌞

great image from @sarahkleinerwellness on low-E window light transmissivity (can vary by window)