TIL: You know how your furnace filter has its dimensions printed on it, in big letters, like “16x25x5” so that you can easily find the right size replacement at your local hardware store? Rich had to power cycle everything briefly, and now the fancy touch screen thermostat that came with the furnace (six or so years ago) seems to have failed, and boots up to a solid white screen. Apparently our furnace has some sort of symbiotic relationship with its bespoke thermostat and they communicate via telepathic encoded waveforms that cannot be reproduced by any other thermostat if you want it to work properly, so you need a new one from the manufacturer, and fortunately