Questions to ask when hiring an installer for a new system or repairs

Does the company carry general liability insurance?
Does the company carry workers compensation insurance?
What types of systems do they install?
Which aerobic brands to they install?
Is there any warranty with the installation? If so, who warranties the system? The designer or the installer?
Will the company provide an orientation to go over the system after it is installed?
How long has the company been installing the type of system your property requires?
How long has the company been in business?
Does the installation/repair price include design and permit fees?
Will the company obtain required permits prior to installation or repair?
Does the installer hold a valid installer license by the TCEQ specifically for your system?
Is the installer knowledgeable of the local regulations for your county or entity?
Is the company qualified to service the system after installation?