How Lattice Screens Cool Buildings in Hot Climates

Perforated screens cool buildings by blocking sun while letting air pass through.

How Lattice Screens Cool Buildings in Hot Climates

Long before air conditioning, builders in hot regions used perforated screens to keep interiors comfortable. Known as celosia in Spanish, mashrabiya in the Arab world and jali in South Asia, these latticework panels do several jobs at once. They block the sun, let breezes through, soften light and protect privacy. Understanding how they work makes them a powerful tool for contemporary design.

Blocking the sun while keeping the view

A lattice screen intercepts direct sunlight before it reaches the glass and the interior. Because the openings are angled and sized to cut the high midday sun, the screen shades the building during the hottest hours while still allowing diagonal views out. The wall behind stays cooler because it never receives the full force of direct radiation. This passive shading reduces the heat load on the building dramatically.

Letting air move through

Unlike a solid wall or a closed window, a lattice is porous. Air passes through the openings, which means a screened facade can shade a room and ventilate it at the same time. In climates where afternoon breezes are reliable, this airflow carries heat away and keeps interiors fresh without mechanical cooling. The screen turns a wall into a filter rather than a barrier.

Filtering light and reducing glare

Direct sun creates harsh contrast and uncomfortable glare. A lattice breaks that light into a softer, dappled pattern that moves across floors and walls through the day. The interior stays bright but calm, and the shifting shadows add a quiet visual richness. Designers prize this quality because it brings daylight deep into a room without the heat or harshness of an open window.

The evaporative and privacy bonus

Many traditional screens worked alongside water. Air drawn through a mashrabiya often passed near porous water jars, cooling further by evaporation before entering the room. The screen also protects privacy, letting occupants see out while strangers cannot easily see in. This combination of cooling, light and privacy is why the device persisted across so many hot cultures for centuries.

Materials and craft

Lattice screens can be carved stone, fired clay, concrete block, perforated metal or precision joinery in wood. Timber screens in particular bring warmth and fine detail, and they reward skilled millwork. Workshops focused on high-end carpentry, such as Vertical Custom Supply, can produce custom patterns that tune the openings to a specific orientation and sun angle. The geometry of the lattice is not decorative alone; the spacing and depth directly control how much sun and air pass through.

Using lattice screens today

Contemporary practices in hot regions, including studios like MÉTODO Arquitectos, return to the lattice because it solves real problems elegantly. To apply it, orient the screen toward the strongest sun, size the openings to your latitude and prevailing winds, and treat it as part of the building's climate strategy rather than a facade decoration. Done well, a lattice screen cools the building, calms the light and gives the architecture a distinctive, breathing surface.