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Design Temperatures and Degree of Exposure

Choosing internal and external design temperatures and allowing for the building exposure when assessing heat loss.

Internal design temperatures

Every heat loss starts from agreed room temperatures. Typical internal design values used in UK heating design are around:

  • Living room and dining room: 21°C
  • Bedrooms: 18°C
  • Bathroom: 22°C
  • Hall and landing: 18°C
  • Kitchen: 18°C

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