It's funny to me to read the overwhelming responses in favor of AC. If I was sailing in summer (June - Sept) I would want AC. But I regularly sail in the Spring, late Fall, and Winter and only use my AC when I am at the dock. It is very rare for me to use the AC while at anchor or on a mooring. I can count the number of times on one hand in over 150 days/nights in the last few years.