The building envelope: where heat actually escapes

Adding attic insulation, sealing hatches and penetrations, replacing window and door seals. These are typically the fastest-paying improvements.

Facade insulation and window replacement significantly reduce heat loss, but the payback period is long. We recommend planning these alongside other renovation work.

In cold, windy weather, leaks are noticeable by hand. For a more precise assessment, thermography or an air-tightness test is suitable.