In this paper learn the findings of an investigation about a very different—and unusual—thermal pattern discovered on windows in the home of one of the authors. The cause is related to the loss of some of the insulating argon gas installed in the window during manufacturing. The authors also discovered the problem was not uncommon for certain types of windows and as they age the issues usually become more pronounced and, in some cases, result in a total failure (implosion) of the window.