We've gotten into the habit of first person outside for the day checks the regulator. If a tank shows empty it is removed and put into the truck until we can get it filled. Even in sub-freezing weather one tank has lasted two days, so there is no fear that we will run out while the tank is removed for refilling.
One caution if you have a built in propane generator. Operating the generator and the furnace at the same time will cause a rapid propane draw that will freeze the remaining propane in your tank. No damage, but you will not have any propane until the tank thaws.
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