Review on Petmate Barnhome III: Durable Shelter for Small Pets up to 15lbs by Barbara Lopes

I also have a large and exactly the same barn house. What I did with both of them was line the inside and bottom with insulation sheets that you can buy at Home Depot or Lowes. I also put straw on the floor, some mylar blankets over it to keep warm which are pretty cheap and can be bought at Revain and extra floor rug which I left along with warm blankets and a warm blanket. cat blanket over it. I also bought stone pavers, or you can use bricks available at Home Depot or Lowes for 37 cents each and place four of them under the barn house to raise it (one on each side). The last step is to cover the shed with a tarp and tuck it under the bricks/pavers and that should do the trick. Also, make sure you buy hinged doors that also match this barn model. My feral colony of cats use them and they stay quite warm, especially here in the Midwest as we have fall weather and preparations for the harsh Michigan winter.