We signed up for Home Generator Preventative Maintenance Program with McCormick Electric. It has been one of the best investments we have made. They perform the 6 Month Maintenance per agreement and have been top notch with their employees and work ethic. They have even followed up after a power outage to ensure our generator is good to go! Our agreement expires at the end of this year and we will be renewing. Love their No Hassle, Worry Free Service!