It was all about trying to change the filter, and the furnace was on and it suddenly went ‘whoosh’ and then there was this burning smell in the house etc. etc. I called the gas company emergency (after you of course, sorry…) and they walked me through turning the furnace way down so it was off and then changing the very dirty filter and also asked if I had pets, (‘yes’), and then suggested the burning smell was burning dust and cat hair and after I got up the courage to peek into the basement storeroom to see if the furnace had burst into flames and it hadn’t I decided I didn’t need to leave and wait it out at Keren’s and in fact it’s now above 15 degrees Celcius in here for the first time in days so it was all worth it.