{"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"I see this on almost every \"passive solar\" home I audit: the overhangs are wrong."}]},{"type":"paragraph","content":[{"type":"text","text":"Not a little wrong — "},{"type":"text","marks":[{"type":"bold"}],"text":"catastrophically wrong."},{"type":"text","text":" Either they block winter sun (defeating the purpose) or they let summer sun pour in (turning the house into a greenhouse in July)."}]},{"type":"heading","attrs":{"level":3},"content":[{"type":"text","text":"The Real Cost"}]},{"type":"paragraph","content":[{"type":"text","text":"A south-facing window with a poorly sized overhang can cost $200/month in unnecessary heating OR cooling — that's $2,400/year. Over a 30-year mortgage, you're looking at $72,000 in wasted energy."}]},{"type":"heading","attrs":{"level":3},"content":[{"type":"text","text":"The Fix Is One Formula"}]},{"type":"paragraph","content":[{"type":"text","text":"Overhang Depth = Window Height ÷ tan(Summer Solar Altitude Angle)"}]},{"type":"paragraph","content":[{"type":"text","text":"That's it. The summer solar altitude angle is: "},{"type":"text","marks":[{"type":"bold"}],"text":"90° − Latitude + 23.45°"},{"type":"text","text":" (on the summer solstice)."}]},{"type":"paragraph","content":[{"type":"text","text":"Example: At 40°N latitude with a 4-foot tall window:"}]},{"type":"paragraph","content":[{"type":"text","text":"• Summer altitude = 90° − 40° + 23.45° = 73.45°"}]},{"type":"paragraph","content":[{"type":"text","text":"• Overhang depth = 4 ft ÷ tan(73.45°) = "},{"type":"text","marks":[{"type":"bold"}],"text":"1.19 feet (about 14.3 inches)"}]},{"type":"paragraph","content":[{"type":"text","text":"Most builders either guess or use a one-size-fits-all 24-inch overhang. That's double what this house needs — blocking valuable winter solar gain."}]},{"type":"heading","attrs":{"level":3},"content":[{"type":"text","text":"Want the Full System?"}]},{"type":"paragraph","content":[{"type":"text","text":"Inside the course, I walk you through the complete calculation method — including adjustments for wall orientation, thermal lag, climate zones, and how to verify your numbers in the field. You'll also build your own spreadsheet calculator and run 3D shadow analysis in SketchUp."}]},{"type":"paragraph","content":[{"type":"text","text":"Stop guessing. Start calculating. ☀️"}]}]}