LETI Retrofit Guide – U Value Sweet Spots

[Gabriel Hyde]

Annex G of the LETI guide contains very useful charts that identify external envelope U Value sweet spots. There are charts for the following three climate conditions:

→ Mild – minimum external temperature 0 deg C
→ Moderate – minimum external temperature -5 deg C
→ Cold – minimum external temperature -10 deg C

Does anyone know how to relate these temperatures to different parts of the UK? For example, is ‘minimum external temperature’ the average lowest daily January temperature?

• This topic was modified 2 years ago by Gabriel Hyde. Reason: Editing glitches

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