I thought this might be helpful... I have used these in the past when I have rescued stray cats... I haven't tried the solar covers... will read up on those... but have used the snuggle boxes.... and you can get the styrofoam pieces at Home Depot.. down the contractors aisle by the wood. And I didn't use the latch top type of box.. just the regular snap top type. Hope this helps.. and thanks for taking care of those fur-babies!
Winter Shelters
Just search feral cats --snuggle boxes -- warm boxes -- birthing boxes
Here's a couple of variations:
Instead of using plastic containers, turn instead to Styrofoam coolers (the type you can buy at a 7-11) You can buy several and build a cat condo of warmth by cutting holes into the foam (after securing the tops of the coolers with duct tape). Stuff the inside with straw (wheat straw is best) hay should be avoided.Straw is dried and if a stray cat enters the enclosure wet, the straw will act as an insulator. Turn the foam coolers so the doorways are away from the wind. Mount them on several pallets to keep them off the chilly ground lay an old rug down underneath. Sprinkle dry cat food around the area. Weight the coolers down accordingly.
-Submitted by Georgia- caretaker of 20 cats
It depends upon how strict the budget is and where they live. I think it might be hard to get straw if it's an urban/suburban area? Because that's my best tip. We purchased two VERY cheap plastic containers from Wal-Mart (total about $17) - one that fits inside of another one. We bought a roll of R-19 insulation from Home Depot ($15). We cut the insulation to completely wrap around the length of the "inside" box, and cut strips to fit the sides. We placed the box down into the insulation, and squashed the lid down on top. Took a sharp knife and cut holes in either side, and used duct tape to "seal" the space between the two boxes, so no insulation was exposed. We stuff these insulated homes with straw, which is easy to replace because the top pops off, you can just lift the insulation to pop the other top.
Hope this helps!