Their technicians are very friendly but behind their smile, they have intention to cheat you. I hired one to install a 50 gal gas water heater. They charged me $2,800. The tank costed around $700 only. Thus, it means they charged around $2,000 or less for the installation labor charge only. Even the tank was not energy-certified thus no way to get a rebate from the state government. This was my very first experience with tank replacement since I moved in a single house last year. They'll cheat particularly people who don't have any knowledge about HVAC.
Never ever call them and find a technician on Yelp and pay a reasonable price.