Would straw or styrofoam be a better insulator inside the walls of an outdoor cat shelter?

Straw because it keeps you warm and animals plus styrofoam is less stable Ill add more its really a no win situation. It depends on what you want or have. Styrofoam padding will absorb heat and not cold to an extream extent, styrofoam blocks do not decay and are good at keeping inside tempetures in.As long as theres a source like a heatlamp, but most syrofoams are toxic and or a cat will more than likely chew on it and choke wither its toxic or not.

Straw is good because it is biologicle degrateable and cats can eat it more safely. Keeps them warm but gets dirty really quick and can decay pretty fast if the shelter is open for the cats to go in or out and air will pass through more freely it will also attract other insects and animals like fleas are the worst, ants, snakes, possims, ect.... If you are making or have say like a cat house one with a door that air can pass through I think it would be best to insulate the inside with styrofoam block then covered again with a plywood so the syrofoam can not be easily gotten into and put a small low power heatlamp on a ext. Cord with a safety cover so it has a heat source but will not catch he wood, cats, or styrofoam on fire this will reduce cost in a way kinda a one time fix unlike staw has to be replaced and mite get used as a litter box or home to other organisms.

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