There is nothing like lying on a vinyl covered bunk in a ‘pool’ of sweat with perspiration dripping off your face, yes I’ve been there and got the medal! Fortunately these days the majority of bunk coverings are breathable so lying in bed on a hot night isn’t such an ordeal! When we first took our Channel 31 down to the Canaries many years ago you couldn’t easily purchase an off the shelf windscoop so I made my own in our sail loft. At anchor with a breeze blowing it was excellent at directing fresh air down the forehatch and out of the companionway or through the aft hatch(s). These days there is a choice of either the original Windscoop or the more sophisticated Blue Performance design which has a built in mosquito or bug net to help keep below deck an insect free zone and specially designed panels which help catch the breeze from any direction. For that hot airless night in the marina when you’re plugged into shore power and electrical consumption isn’t an issue, the Caframo range of fans are worthwhile considering; incidentally the Taku (not cheap but a superb bit of kit) is a hatch mounted 12 volt fan which can be swivelled to either exhaust air out of a cabin or draw fresh in.
CoolMax will also help you have a comfortable nights sleep, Jenny, who can get very hot at night, (lucky me) considers it to be the bees knees. It is a high tech fabric, designed to manage moisture by improved air circulation and to reduce humidity build up whilst you rest. The material is manufactured from an innovative fabric which "breathes", so that when you lie on it, the heat and moisture generated by your body will evaporate within the first hour. This will then allow your body to maintain a cool environment while you rest. The make up of the fibre allows the air to flow freely through the fabric and through the core, ensuring that no moisture will be trapped inside the mattress, pillow or cushion.
Keeping Cool Onboard Your Boat