I live in ny and wonder about how much pellets to store i have a 1800 sqaure foot ranch and insulation is average I will probably start the stove around november and and run for say 4 months i know there are alot of variables that will effect the amount but looking to get a general idea i currently have 1 ton but know that is not enough looking to get another ton delivered. should 2 tons be enough or 3 thanks