Cold house + dead furnace + panic shopping = people firing up the wrong heater indoors. I’m Mike. This is about propane heater indoor safe use during outages – not which Instagram cabin aesthetic burns the cleanest. Rules that matter Only heaters explicitly rated for indoor use Follow BTU and room size limits Ventilation per manual – oxygen depletion sensors aren’t magic CO and smoke alarms working Never sleep next to an improvised heat source you don’t understand Store cylinders upright, outdoo