20 Heat Sources That Work When the Power Goes Out (GET THESE NOW)

February 2021. Texas lost power for 4.5 million homes. Temperatures inside dropped to 20°F, people burned furniture to stay warm, and 246 died—some from cold, others from carbon monoxide because they didn't know which heat sources were safe indoors. Twenty heat sources work when the power goes out. Mylar blankets reflect 90% of body heat and cost $1 each. Disposable hand warmers hit 135°F for 8 hours. A Mr. Heater Buddy runs on propane bottles and heats 200 square feet for 3 hours per bottle, but a $30 adapter lets you run it off a 20 lb tank for 60 hours instead. Kerosene heaters push 23,000 BTU and burn $4 of fuel for 10 hours. A diesel parking heater—same unit truckers use—runs on 12V, burns a cup of diesel per night, vents outside, and costs $120 shipped. Wood stoves, rocket mass heaters, passive solar water barrels, and electric blankets powered by battery banks all solve different parts of the problem. Three sources are safe indoors with zero ventilation: electric blankets on battery power, the Mr. Heater Buddy with its low-oxygen shutoff, and radiant electric heaters if you have the inverter capacity. Everything else requires ventilation or it produces carbon monoxide. A propane heater in a sealed 10x10 room creates lethal CO levels in under 2 hours. Most people who die during blackouts don't freeze—they suffocate because they didn't crack a window. Storage matters too: propane cylinders expire after 12 years, hand warmers lose potency, and fuel canisters rust. Test every piece of gear in October, not when the house hits 48°F.