It Pays To Do Some Research Before Hiring a Home Inspector
The length of the inspection matters. Generally a three hour + inspection is more thorough than a 90 minute inspection. Check for industry affiliations, normally a good sign that an inspector is qualified (ASHI, InterNachi, NAHI, etc.)
Consider hiring an independent home inspector (someone not recommended by your Realtor) to avoid any possible conflict of interest.
Ask your friends and family for references. Check an inspector's references before hiring.
States have varying requirements for licensing home inspectors. In Connecticut all Home Inspectors need to be licensed and all interns and trainees need to be supervised by a licensed inspector. Check with the Connecticut Department of Consumer Protection to see which companies are licensed and insured.
You can also check state websites and the Better Business Bureau for any complaints regarding a specific inspection company.
Experience matters. The longer a company or individual inspector has been in business the better. Angie's List recommends hiring an inspector who has performed a minimum of 1000 inspections and has at least 5 years of experience.