Another plug for Mr. Heater. I have one going now since the HVAC guy can’t get here til tomorrow. You can buy a post made by Mr. Heater for a 20# grill bottle & with a hose(s) run A Mr Heater buddy heater & a Stove etc on one grill bottle. I’m using the $5 disposable cans at the moment.
Be sure to get the indoor/outdoor model so you can use it in a blind or in the house.