South- and west-facing windows: reduce summer heat
When summer sun heats your room, not every solution works equally well. Here is how to choose sun protection that really works – even as a renter.
Why south and west heat up
South windows get the most sun, but in midsummer it stands high. West windows are hit by the low afternoon sun – exactly when the room is already warm. Our Sun-hours calculator shows how much sun your window gets for your direction and city.
Outside beats inside
Exterior protection (shutters, awnings) stops heat before it reaches the glass and is much more effective than anything in the room. Inside, the heat is already in. For renters without exterior options, light-coloured, reflective solutions inside or directly on the glass are the best choice.
Solutions for renters
Reflective heat-control film, suction-cup sun shades, pleated blinds with an aluminium coating, thermal curtains with a light backing, and adjustable blinds. A mashrabiya lattice filters light and lets air circulate – exactly what it was historically built for.
Ventilate properly
Air the room early in the morning and at night; keep windows and curtains closed by day. It is free and complements any sun protection.
Checklist
- Sun hours checked for your direction
- Exterior solution allowed? If not, light solution inside or on the glass
- Heat-control film: check suitability for your glass with the maker
- Choose a light backing or metallic coating
- Ventilation plan: morning and night