My understanding is that there are some localities where 'inside of the house' is used; but that most would consider it incorrect. The inside of the house is cooled by air-conditioning, so is comfortable in the summer. The air-conditioner is located inside the house.
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GPYOutside of a dog, a book is a man's best friend. Inside of a dog, it's too dark to read.Sounds like something Groucho Marx once said.