Does being first on Google mean a company is the most qualified?
No. Search position is not a credential. Treat search as discovery, then independently verify qualifications and business identity.
Is one certification enough?
There is no universal answer. The appropriate education depends on the work. Foundational chimney knowledge, fuel-specific hearth knowledge, inspection education and manufacturer training can complement one another.
Should I verify the company or the technician?
Both, but pay special attention to the individual credential holder. Ask who will perform or supervise your work and verify that person's current credential when possible.
Does certification guarantee good work?
No credential can guarantee a specific outcome. Certification is one useful screening signal alongside documentation, insurance, experience, scope of work and professional conduct.
What if a company recommends a very expensive repair?
Ask for documentation supporting the recommendation and consider another qualified opinion when the repair is substantial.