just to add to the discussion, i did toss the idea as there is a local dary that used to give away tons of cow poop free to gardeners here, consider a heat sink the large amount of poop will produce not only hear but i have been reading about producing methane, there are some low cost systems in use in places like the philippines, this solves the issue of smell and you produce gas to run burners or a generator, once the manure is finished you can bag and sell the composted manure, with a heat sink ( dry mass of dirt) the dirt will slowly release the heat on cold days and help in heating at least? just some ideas, i think i recall reading some people from japan were doing stuff like this in Fla in the 70's
if i ever get to build in Philippines i will do the methane if i ever have a lagre supply of poop, i hear chickens make's the best methane production, but then i hate the mass raising of chickens and prfeer free range so there goes the poop lol