1. Insulation: Installing insulation in the walls and roof of the castle can help to reduce heat loss and keep the rooms warmer. This can be done using a variety of materials, such as fiberglass, cellulose, or spray foam.
2. Double glazing: Replacing single-pane windows with double-glazed windows can also help to reduce heat loss. Double-glazed windows have two panes of glass with a layer of air or gas between them, which helps to insulate the room.
3. Heating system: Installing a central heating system can help to keep the rooms warm during cold weather. This can be done using a variety of fuels, such as gas, oil, or electricity.
4. Dehumidifier: A dehumidifier can help to remove excess moisture from the air, which can help to reduce the feeling of clamminess. Dehumidifiers are available in a variety of sizes and can be used in individual rooms or throughout the entire castle.
5. Ventilation: Ensuring that the castle has adequate ventilation is important for reducing moisture and improving air quality. This can be done by opening windows and doors regularly or by installing a ventilation system.
By implementing these measures, a modern owner can make castle rooms less clammy and more comfortable to live in.