nanci -
I have a pet door into the garage and smell and/or heat has never been a problem (2 1/2 years)- I use Fresh Step litter. Why don't you give that a try first - leave the garage door opened slightly for a few days before installing the pet door to see if it works for you.
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Richmond,VA - Martinsville, VA - Hilton Head Island, SC - Mallory Square
Rescuing one cat may not change the world, BUT for that one cat, the whole world will change.
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