Pretty standard size if you are running the whole house: heat, hot water, cooking. I hope propane up there in Alberta is cheaper than here.
Michelle, -42°C is basically the same as -40°F. That is not a cold "snap", that is FRIGID!
Luckily, I'm getting a tankless water heater, so that should cut down on the consumption somewhat. The propane company that I've gone with is $0.51/L, so about $750 to fill a 500 lb tank. Also a $21.95 delivery charge. That's not bad considering they're coming from the city (60ish miles away).
Down to at least -44 tonight, which equates to -47.2F. A tad nippy. At least it's sunny during the day so the solar batteries can charge. We lost power for over 12 hours last night. Although the batteries were 68% charged and I had a small propane heater going in the shed, it was just too cold for the battery juices to flow, so to speak. Of course it was so cold that I couldn't get the ripcord on the generator to pull. Then... the bricks in my wood stove shifted causing the flames to go directly up the pipe.... so i had to let the fire completely die down and the bricks cool enough in order to shift them back into place.
The tank delivery had to be rescheduled to tomorrow. They were loading our tank onto the truck when the crane cable snapped, supposedly due to the cold. So, they're coming tomorrow morning to deliver the tank and tomorrow afternoon to fill it.
All of our tradesmen say they won't be back until Wednesday at the earliest, as it's just too cold.
Another happy day at the Farmer-Brown homestead!
P.s. all of the chickens are doing fine. No heat in the coops! They have bibs of frost on their chests, but no frostbite.

Glad you're getting your fuel tank today (crazy about the cable on the crane snapping). Great news about your chickens handling things so well 

