p>We have reason to believe that sometime in 2020 there will be a switch to HFO blowing agents with a much lower Global Warming Potential (GWP), but no manufacturers of XPS insulation have switched blowing agents yet. So as it stands, any XPS rigid insulation board you purchase will still have an impact several hundred times worse than EPS. And the moment that the switch is made, manfucturers will contact us with the news, so if you <strong><a href="/guides/3521/climate-zones-map-usa-canada-construction/" target="_blank">sign up as an Ecohome Member for free</a></strong>, you<strong><a href="http://ecohome.net" target="_blank"> </a></strong>will get a notice as soon as we know! </p