Sun Hours Estimator
Estimate peak sun hours and solar gain by city, season and facade orientation — for passive solar design decisions.
Location
Overrides city selection
Facade Orientation
Estimated Peak Sun Hours
Summer
—
hrs/day
Spring/Autumn
—
hrs/day
Winter
—
hrs/day
Annual avg
—
hrs/day
All-facades comparison (annual average)
N
—
NE
—
E
—
SE
—
S
—
SW
—
W
—
NW
—
Solar Gain Estimate
Peak solar gain (summer)
—
W
Useful gain (winter)
—
W
Design Guidance
South-facing (N hemisphere)
Best for passive solar gain in winter. Use overhangs to block high summer sun. Ideal for living spaces.
East-facing
Morning sun — good for bedrooms and breakfast areas. Lower afternoon heat gain.
West-facing
Afternoon/evening sun. Can cause overheating in summer — use external shading or high-performance glazing.
North-facing
Diffuse light, minimal solar gain. Good for studios needing consistent north light. Minimize glazing here.