01 — Orientation
Which way the opening faces
West and south-west openings take the worst of the late-day load and are almost always where a solar project starts. A north-facing opening on the same patio may need nothing at all. This is why we specify per opening rather than per house — two sides of one structure are rarely solving the same problem.
- West and south-west openings usually lead.
- East openings matter for morning use, not afternoon.
- North openings often need no solar treatment at all.