In the walls · 2–4 weeks

Mechanical

HVAC ducts, wiring, and plumbing runs are installed in open walls.

Full learning, questions, checklists, and inspection tips for this milestone are being authored. The Insulation milestone is complete today.

Common mistakes here

An oversized system short-cycles, leaves humidity behind, and feels worse than a correctly sized one.

Insulation and air sealing close the envelope.