Overpromise is correct. When a contractor offers you a 25 year parts and labor warranty on any kind of system that they install, you should know that the contractor is scamming you. It is not reasonable for any contractor to expect to honor that type of warranty on any mechanical or electrical system, especially a small contractor installing solar systems. They have no intention or ability to make good on the warranty. They just want to make a sale. Ask them to purchase a performance bond in case they are not around in 25 years.
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