A solar proposal is a stack of assumptions wearing a number. Change one and the whole thing moves — which is why two quotes for the same roof can look nothing alike, and why "saves you $60,000" means very little on its own.
This guide tells you what to look for. Our tool does the looking — it takes your numbers, runs them through our own model, and tells you what's off, what your estimated savings come to, and the exact questions to put to your installer. Free right now.
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