Duct Sealing: Which Ducts You Can Seal Yourself, and Which Ones You Cannot
Assess accessible duct leaks, record what you find, and compare repair quotes with a practical survey and five questions for your contractor.
Insulation
The building fabric side of comfort: loft and attic insulation, air sealing, duct leakage, glazing and shading. Payback periods calculated honestly, including the cases where the work does not pay back and you should spend the money elsewhere.
How to Find Air Leaks Without a Blower Door Test
The usual methods barely work on a still day. Here is the box fan trick that makes them work, the safety step nobody mentions, and where the leaks actually are.