How Stand-By Generators Work
It's very easy! Unlike portable generators, permanently installed stand-by generators eliminate the need for extension cords and gas cans by operating on an existing fuel supply. Here’s how it works:
The generator monitors incoming voltage from the utility line
When the power is interrupted, the generator detects the problem and goes to work
The automatic transfer switch safely disconnects the utility line and simultaneously connects a new power line from the generator
Power is then restored within seconds
When the utility power is restored, the generator turns back into stand-by mode

Gray’s HVAC Service, with the help of Generac Systems offer the highest quality, the best performance, the most advanced features, and the best prices in the industry. For reliability and long life, our models are powered by Generac’s OHVI 4-cycle industrial engines … the industry’s only air-cooled engines designed specifically for the demands of stand-by generator operation. Generac generators all come with their Quiet Test feature, which means that when your generator is running it is about as quiet as a car idling in the driveway. With all the amazing benefits a Generac generator installed by Gray’s HVAC Service has to offer don’t wait any longer. Contact us today and schedule your free generator estimate with one of our experienced technicians!

