StringJunky Posted December 26, 2023 Share Posted December 26, 2023 Imagine painting a mirror and then beaming a sun-like spectrum at it. Will that still reduce the heat-producing IR wavelengths passing right through to the other side? What I'm thinking is, if you papered the ceiling with mylar material and painted it, could that improve insulation? Link to comment Share on other sites More sharing options...
swansont Posted December 26, 2023 Share Posted December 26, 2023 It depends on the properties of the material. Some transmit thermal IR (polyethylene does) and it looks like mylar transmits a decent amount near 10-15 microns https://www.researchgate.net/figure/IR-transmission-spectra-of-polymeric-substrates-Mylar-with-thickness-d-40-mm-1-and_fig2_327932890 Link to comment Share on other sites More sharing options...
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