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Not just any ordinary company can come over and offer mediocre services and give your home lousy results. You must learn to identify what a quality company looks like, starting with the range of prices offered; if they are overpriced, then that is your first sign.
Secondly, the capacity and experience their technicians have and the variety of services offered. Choose a company that has experience in what they are doing and offering, don't go with the first company that promises quality but delivers the exact opposite.