I have both , the 50-93 and the 30-95. Both great stoves. At rated operating BTU's , both models will use the same amount of coal in 12 hours , which is one 5 gallon pail. Ones no better than the other as far as coal consumption goes. Now , lets talk efficiency. The 50-93 puts out a lot more heat. It's like being hit by a wall of heat when walking into my basement , which is not quite 1700 square feet. The 30-95 will do the same thing in my garage , which is half the size of my basement. When experimenting with the stoves , I found that if the 30-95 is cranked up (over fired) to feel like it is putting out the same amount of heat as the 50-93 , the fire would be out in 12 hours. So , that tells me , if both stoves are running at RATED BTU's , and both stoves are useing a 5 gallon pail in 12 hours , the 30-95 is less efficient. That's great if you don't need the heat output of the 50-93 , and the chimney needs the heat in order for good draw. On the flip side , should you need to calm down the more efficient 50-93 to mtch the output of the 30-95 , you would have hardley any heat going up the chimney to help with draw. This is my hands on observation of the two stoves. Like I said , both GREAT stoves. Now , back to your house; From the way you describe your house / location , I also agree with capecoaler. Go with the bigger one(50-93). You can throttle it back some. The 50-93 will coast along and heat your house. That's better that the 30-95 being over fired , and useing more coal. If your upstairs was fully insulated , I'd then recommend the 30-95. One nice feature of the 30-95 is that the hopper does lift out through the top.