22/08/2026
YOU CAN’T FIX WHAT YOU CAN’T SEE! 🫣🏠💨
When improving the thermal performance of an existing home, insulation is only part of the story.
A blower door test measures how airtight a home really is — revealing hidden air leaks around windows, doors, floor junctions, penetrations and other areas that can undermine comfort and energy efficiency.
Testing before a retrofit helps us understand where improvements will have the greatest impact. Testing afterwards tells us whether those improvements actually worked.
It’s a simple principle: measure first, improve intelligently, then verify.
Because a high-performance retrofit shouldn’t be based on guesswork.
Trunorth Projects | Building science applied to existing homes.
