The plan was to use bales of straw as the walls of the structure to give it incredible insulation and help control the environment throughout the year. (happyhomeanimalsanctuary.org)
You can also place it under a porch or deck and surround it with bales of straw for added protection from the cold and winter wind. (spayandstay.org)
You can add mulch for next to nothing by buying bales of straw from nearby farmers or using shredded newspaper printed with non-toxic vegetable ink. (moneysense.ca)