Adding Air and Heat to Home Addition

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I have a question about whether to add heat \ air conditioning to a pre-existing addition. This is my first flip and I am wondering whether to add AC \ heat to the addition. This is a 3\2 home with a 300 sq ft addition. The original home is only 995 sq ft. We are looking for the best way to have the square footage included in the listing, but learning it could cost as much as 4k. This would be 10% of the cost plus improvements. The ARV would increase. Is it worth adding this feature in order to increase a larger buyer market?