A living room with large west-facing windows can become too warm in the late afternoon, even in a house in an area with mild temperatures. In a bedroom facing a damp hillside, the problem may be different: cold surfaces, condensation and difficulty bringing in fresh air. In Madeira, designing for thermal comfort means considering the site, altitude and the house’s particular exposure, rather than assuming that the island’s climate removes the need for careful planning.
1. Start with the site and orientation
The south coast, the north coast and higher-altitude areas have different conditions. Even within the same parish, a hillside, a valley or a neighbouring building can affect solar exposure and wind conditions. The site assessment should identify shading, obstructions, views and potential exposure to wind-driven rain.
The room layout should balance these factors. An orientation that allows sunlight into the house in winter can be useful, but needs protection in summer. Bedrooms and living rooms should be considered in relation to when they will be used, without making the sea view the only criterion. It is worth comparing alternative positions and orientations for the house before finalising the floor plan.
2. Control sunlight and improve the building envelope
Comfort depends on air temperature, but also on the temperature of walls, glazing and the roof. A well-designed building envelope helps reduce fluctuations and keep internal surfaces warmer. Insulation should be continuous, with particular attention to junctions between walls, floor slabs, columns and openings, where thermal bridges can occur.
For windows, the glazing, frames, glazed area and shading need to be assessed together. Double glazing alone does not resolve overheating. External shading, such as overhangs, shutters or external blinds, can limit heat gain before sunlight passes through the glass. The geometry should suit the orientation: a horizontal overhang does not provide the same protection against high-angle sunlight and low-angle afternoon sun from the west.
3. Create effective natural ventilation paths
Cross-ventilation benefits from openings on façades subject to different wind pressures and an unobstructed internal airflow path. Two windows alone do not guarantee effective air renewal: their position, effective opening area, internal doors and obstructions all matter. A deep or heavily partitioned floor plan can make airflow more difficult.
Openings at different heights can also encourage air movement driven by temperature differences, provided conditions are suitable. However, performance varies with the wind and the difference between indoor and outdoor temperatures.
The design should allow for safe, practical use: accessible windows, protection against falls where necessary, and solutions that accommodate rain, noise and security requirements. Night-time ventilation only helps cool the house when the outdoor air is sufficiently cooler and openings can safely be left open.
4. Manage moisture without relying solely on windows
Ventilation helps remove moisture generated by bathing, cooking and occupancy, but the outcome also depends on outdoor conditions. During humid periods, opening windows may not be enough to reduce indoor humidity. Airing rooms is not a substitute for correcting water ingress, leaks or waterproofing defects.
Kitchens and bathrooms need an appropriate extract ventilation strategy, coordinated with the air supply. A more airtight house reduces uncontrolled air leakage, but requires planned air renewal. Depending on the design, it may be appropriate to supplement natural ventilation with mechanical ventilation and, where necessary, dehumidification.
Preventing condensation requires a combination of humidity control, insulation and measures to address thermal bridges. Choosing moisture-resistant materials does not eliminate the source of the problem.
5. Coordinate the design and check the construction
Decisions should be coordinated across architecture, engineering and specialist disciplines from the outset. Assessing thermal performance allows roof, wall, glazing and solar shading options to be compared. Where exposure or geometry raises questions, a more detailed analysis can support decisions, without replacing an assessment of how the house will actually be used.
In Madeira, external elements should also account for wind exposure and, near the sea, corrosion. Planning constraints affecting overhangs, façade alterations or other elements should be checked for the specific site; they may vary by municipality and according to the applicable planning instruments.
During construction, it is important to check insulation continuity, window installation and ventilation paths. A well-designed solution can lose effectiveness through poor workmanship.
Checklist
- Assess altitude, orientation, shading, wind and exposure to rain on the site.
- Compare the house’s position, orientation and room layout before finalising the floor plan.
- Size glazing and solar shading for each orientation.
- Ensure continuous insulation and address thermal bridges.
- Define air inlets, airflow paths and outlets, allowing for closed doors.
- Provide extraction in wet areas and assess the need for mechanical support.
- Check the safety, accessibility and ease of use of openings.
- Confirm municipal constraints and coordinate the designs.
- Inspect critical building envelope and ventilation details during construction.