Fans help for peak periods but we use a boom
awning I made up that spans lifeline to lifeline over the boom, starting at the mast and going backwards almost to the sternrail seats each side of the topping lift. We have very low humitidy so we only suffer heat, not the muggy feeling. The boom tent lowers cabin temps from 90/95 to 70/75 at mid-day with just a breeze supplied by the std H26 vents and hatches.RayS/V Speedy