How long have you been in business?
You are best to choose a company that has been around for a few years. That will give you some reassurance that they must do good work, otherwise they would not have lasted in the business.
You should also check to see if they are listed in the Better Business Bureau (BBB).
Look for a company that has been in operation for a while and has cultivated a good reputation and list of client testimonials. A company with a long-standing operation and strong reputation will give you insight into the kind of service to expect.
Carpeting changes dramatically over time and so do the methods used for cleaning them. A cleaning company that has been in business for a long time has a greater depth of knowledge about the materials used in older carpets as well as modern ones. A long time in the business also indicates that their customers have been happy with their services.
The carpet cleaning company you select should be happy to forward you customer testimonials and recommendations. Any decent carpet company will be proud to state that most of their business comes through customer referrals.
For more information on carpet business reliability, click > ComPro Carpet Cleaning