Shop Heat

I hear my garage all winter, while I am out in it working.
I have two heaters in it, both propane, using the small 20lb gas grill bottles.
One is a torpedo that I use to take the coldness off when it is below 20f effective but noisy.
The second is my favorite it’s a vent free wall heater made by ReddyHeater it was about $200 at Home Depot, right now it is 78 degrees in here, just using the wall mount, it makes no noise or fumes. It will burn about tank of propane a week if it is super cold out.
So it runs me $14 a week to keep myself warm.