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Pausito · smart living

Automation

How do I keep my home cool with (automatic) sun shading?

Short answer

External shading works at least 2 times as well as internal shading; with HR++ glass it blocks about 80 % of heat radiation. Automation helps lower it in time.

Outdoor vs. indoor sun shading: Outdoor shading works at least twice as well as indoor shading; with HR++ glass it blocks about 80 % of the heat radiation.
Outdoor vs. indoor sun shading — Outdoor shading works at least twice as well as indoor shading; with HR++ glass it blocks about 80 % of the heat radiation. (The text inside the figure is in Dutch.)

Explanation

Sun coming through the glass turns into heat indoors. External shading stops it before it gets in. Control by sun, temperature or time lowers the shading before the room warms up. Airing at night cools the house down again.

Rules of thumb

  • External shading works at least 2 times as well as internal shading; with HR++ glass it blocks about 80 % of heat radiation. [SW-S56]
  • Daytime: shading down, windows closed. Evening and night: open everything when it is cooler outside. [SW-S56]
  • An air conditioner uses up to 20 times more power than a fan. [SW-S56]
  • Flanders new builds must stay below an overheating indicator of 6500 Kh. [SW-S50]

Pitfalls

  • A wind sensor is needed: automatic screens or awnings can be damaged in wind. (practical tip, not a source value)

Search terms

These search terms are in Dutch; only terms that also find a topic in English are links.

zonwering hitte oververhitting screens automatisering

Read also

General information, not personal advice. Check the source and reference date.

Sources

  1. SW-S50 Nieuwe EPB-eisen voor 2024 voor nieuwbouw en renovatie — VEKA (Vlaams Energie- en Klimaatagentschap) (Reference date 2026-09-27)
  2. SW-S56 Tips: zo hou je het huis koel in de zomer — Milieu Centraal (Reference date 2026-09-27)

Reference date: 2026-09-27 · Translated with AI from the Dutch original.