I got a recommendation from a tax preparer in a neighboring town who also had a home office, as well as a couple other recs. Had them all out to talk to us and bid. We liked one and contracted for him to do everything: permits, purchase, installation, inspection, advice. We're in pricey Fairfield County, CT, so probably paid about the top of the range for the services plus the cost of a mid-range generator (small house but need to run my office), so easily $11,000 total. But, the time I was out of business those 11 days during tax season and another week the beginning of October and all the food spoilage when unexpected outages hit and hubby slowing his recovering after shoulder replacement by hauling water to flush toilets and eating our and draining our pipes and fleeing to hotels when the temperature drops and the stress and sleeplessness during each hurricane season, ice storm, wind, etc., I really think it's worth every penny. I turn 70 next year and want to be visiting my granddaughter and not loading food into coolers or staying in a 42 degree home. Generator tests itself every Saturday. We have a service contract and just went from twice/year to once; friend who recommended has gone to every two years. Propane guy was showing his apprentice our generator (they now install, but did not then) like a proud owner showing under the hood of his new sports car! He said our Kohler is better than whatever make his employer installs. When we had our chosen electrician install, he said it was then at least 90% of his business. During outages, you hear generators humming all over town.