Two rules drive placement. The panel needs sun for as many hours as possible, and the fan needs to sit high in the attic to pull the hottest air.
If your back of house points south, that is almost always the right slope. South-facing panels catch the most sun in North America. West-facing is the second-best because it gets the long hot afternoon sun, which is exactly when your attic peaks. East-facing works in a pinch but loses afternoon power.
Within the slope, the installer mounts the fan as high as the ridge will allow without hitting the ridge vent or a hip seam. Higher placement means it pulls from the hottest pocket of attic air, which is always at the peak.
We avoid the front slope because of HOA visibility rules and curb appeal. We avoid valleys because of water flow. We avoid the ridge vent itself because mixing intake and exhaust at the same point is a building science miss.
If your only good sun exposure is the front of the house, we will tell you. Sometimes a powered electric fan in a different spot is the better answer, and we will say so.
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One bundled price. Authorized installer. No operating cost.