Do they have positive reviews on Angie’s List? Can they provide referrals both recently and in your area? Poor reviews, outdated referrals or none at all can be a red flag.
Length of time in business.
How long have they been in business? Does the company have a stable growth history or one marked by volatility and upheaval? A solar system built to last 25 years needs a company built to last 25 years as well. Struggling solar start-ups need not apply.
How many customers with your profile have they served? Do they have an intimate knowledge of local regulations? Your solar installation should run like clockwork.
Do they have industry certifications, such as NABCEP? How does the Better Business Bureau rate them? Ethical, reputable companies should be recognized by others in their industry.