I did a ton of research on foam when I was building my house. I couldn't justify the cost vs return by putting in foam. Your a/c will cost more and of course to spray it will cost more. It was going to take at least 20 years to get my money back even including the savings i estimated on my electricity bill being reduced. I also worried about the moisture concerns mentioned above. We don't exactly live in a dry area. I went with blown fiberglass. I figured it was the best bang for your buck. Hope this helps
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