Energywise PA also keeps a current list of solar system contractors for both residential and commercial installations. Another website to find qualified service providers surrounding energy use in your home is PA Home Energy.
For the PA State Sunshine program, Solar installers will have to be NABCEP certified OR must have completed an Interstate Renewable Energy council (IREC) accredited PV training program as well as a PV manufacturer's training program, and successfully installed at least 3 PV systems. The home energy auditors will need to be RESNET or BPI certified.
Click here for a list of NABCEP certified and/or IREC accredited solar installers registered with the State of Pennsylvania.