Combating Heat on Your Boat: Staying Cool and Comfortable

High temperatures can transform the interior of a boat into an oven, making both days and nights unbearable. The key strategies for managing this are shading and ventilation.

Shading Strategies

Sailboats have a natural advantage when it comes to sun protection. Beyond a cockpit bimini, consider:

• A boom awning to cover the roof.
• A shade sail to protect the bow.

These measures can reduce the temperature by 5 to 10 degrees compared to direct sunlight. If such protections aren’t available, cover all horizontal glazed surfaces. While many polyester decks are now made with insulating sandwich construction, polycarbonate portholes can become excellent heat conductors under the sun’s rays.

Ventilation Techniques

Sailing and creating apparent wind is the most natural way to bring fresh air into the boat. When at anchor, choosing a mooring over a marina is often beneficial, as the natural environment is less of a heat source than crowded docks and concrete cities. Position the boat to face the wind, open all portholes (using wind scoops if needed), and ensure sufficient distance from neighboring boats for optimal airflow.

Managing Heat Sources

In the absence of wind, electric fans can help circulate air. Opinions on their effectiveness vary. Some find them noisy, unattractive, and only capable of circulating hot air, while others appreciate any breeze they can provide, especially at night. Consider your own needs and preferences.

While air conditioning might seem tempting, it can confine you to the boat, defeating the purpose of being on the water. Instead, focus on reducing internal heat sources:

• Turn off and unplug all electrical devices, including converters, when not in use.
• Lower the refrigerator thermostat and minimize door openings to reduce compressor activity.
• Consider induction cooking instead of gas to eliminate flames in the galley.

Remember, any device that produces cold also generates heat.

Taking Care of Yourself

Protecting yourself from direct sunlight is crucial. The body loses approximately 2.5 liters of water per day in a temperate climate, and even more in hot weather or during physical activity. Stay hydrated by drinking plenty of water throughout the day. Alcoholic beverages do not count towards hydration.

For more comfortable nights:

• Use slatted bed bases.
• Replace polyester or cotton sheets with linen or hemp, which are cooler and more absorbent.

Finally, embrace the Spanish tradition of the siesta. Wake up early to enjoy the coolest part of the day, and spend the hottest hours in the shade, reading, writing, sleeping, and relaxing without guilt.

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