How do you keep a boat cool in summer?
Summer is undoubtedly the most enjoyable season for boating. Long sunny days, waterside stopovers and meals on deck are all part of the unique pleasures of life on board. However, as temperatures rise, heat can quickly build up inside the boat and make the living spaces less comfortable.
Fortunately, a few well-thought-out improvements and good habits can often help maintain a pleasant atmosphere throughout the day.
Installing external sunshades
This is probably the most effective solution and yet one of the most overlooked.
Many boat owners install curtains or blinds inside their boats to protect themselves from the sun. While they are useful for maintaining privacy, they are less effective at reducing heat.
Once the sun’s rays have passed through the windows, the heat becomes trapped inside and the temperature can rise very quickly.
The best approach is therefore to prevent the heat from entering the boat in the first place by installing external sun protection, such as canopies, external sunshades, protective covers, window shades designed for glazing or shade sails over certain areas of the boat.
Promote cross ventilation
Good air circulation is essential to remove the heat that builds up inside the boat.
To achieve this, promote cross ventilation by opening portholes located on opposite sides of the boat. This creates a natural airflow that refreshes the air inside and helps dissipate heat more effectively.
The timing of ventilation is also important. It is recommended to open up the boat early in the morning and again in the evening, when temperatures are cooler.
On the other hand, during the hottest part of the day, especially during heatwaves, it is best to limit openings to avoid letting even more hot air inside.
Limit heat sources
Some everyday appliances generate a significant amount of heat themselves.
During the hottest hours of the day, try to limit the use of:
- The oven
- Cooking hobs
- Energy-intensive electrical appliances
- Electronic devices that produce heat
Whenever possible, opt for cold meals or prepare your dishes early in the morning or later in the evening.
These small adjustments can help maintain a more comfortable temperature inside the boat.
Use additional equipment
Depending on your boat’s layout and your cruising programme, certain equipment can provide additional comfort.
Fans remain a simple, cost-effective and energy-efficient solution for improving air circulation on board.
On some boats, particularly liveaboard vessels designed for year-round living, air conditioning can also be considered.
Before installing any additional equipment, it is important to check the boat’s electrical capacity and energy autonomy, especially if you regularly cruise away from marinas or shore power connections.
Choose the right mooring location
The boat’s location has a direct impact on the temperature felt on board.
Whenever possible, try to moor in the shade or choose a location that is less exposed to direct sunlight during the hottest hours of the day.
Sometimes, simply changing the boat’s orientation can significantly reduce the amount of heat absorbed through the windows and exterior surfaces.
Trees, nearby buildings or simply the position of the boat in relation to the sun can make a real difference.
Ultimately, keeping your boat cool is not just about equipment; it’s also about planning ahead and adopting good habits.
☀️ Now that your boat is ready to cope with the summer heat, don’t forget to prepare for your next cruises as well. Discover our complete pre-departure checklist to make sure everything is in order before each trip and set off with peace of mind.