Description

Many new homes can be uncomfortably hot in summer, partly the result of increasing airtightness, design trends for larger windows and a changing climate.

Calculations show that internal overheating periods in houses may double or more as average global temperatures continue to rise.

This bulletin gives an overview of passive design options for reducing overheating. It does not consider active (mechanical) ventilation systems.

Scope

This bulletin covers:

• Introduction
• Present and future overheating
• Causes of overheating
• Solutions for overheating
  • Eaves and external shade devices
  • Layout and passive ventilation
  • Windows and glazing options
  • Insulation and thermal mass
• More information