With Uncrate HQ suffering outdoor temps in the high 20's today, we're longing for an extra jolt of heat. Like the Mr. Heater Big Buddy Portable Heater ($107). This indoor/outdoor propane heater blasts out 18,000 BTUs, heating a 400 square feet area for up to 220 hours on one tank — with the thermostat on low. It features an integrated hot air blowing system, an automatic low-oxygen shut-off system, a built-in Piezo starter, and an easy-carry handle.