What is the BMI of your crew? What are they used to? What will the activity be hussle, drinking, eating... How can your ever forecast whether the tropical waves will be coming through that time of year with the possibility of rain on and off all night ever day? After the first 30 years or sailing all over the world without even the thought of AC and no2 two decades with the AC option. For the most part with guests aboard we will turn the AC on and never turn it off. One key is to keep the thermostats at a higher level to not freeze some of the crew out once the boat is closed up and the sun goes down. No more hatch dance for us on crowded boats. Get it if you can, use is reasonably(thermostats in the 70's and never 60's) if you have it.