Residential solar specialist Verengo has announced it has installed its 8,000th home solar system.

Verengo claims it is the first residential solar specialist to reach this milestone, which it said it had accomplished in less than five years.

The 4.9kW system was installed this May on the roof of Sherwin Young's Bakersfield home using Verengo's "Zero Down" financing option allowing the system to be installed at no upfront cost.

"We're excited to have reached this industry milestone so quickly," said Verengo CEO and co-founder Randy Bishop. "It is particularly rewarding to be solarising so many homes in the Bakersfield area which for the last few years has ranked near the top American Lung Association's list of the cities with the worst air pollution."

"We are proud of the fact that the Verengo zero down financing has helped rooftop solar become a mainstream home improvement product available to virtually everyone," said Verengo president and co-founder Ken Button.

Last month, Verengo, alongside other leading US rooftop solar companies such as SolarCity formed the Alliance for Solar Choice to ensure the continuation of net energy metering, which have helped to make solar increasingly competitive in some states but which utilities are attempting to curb as the cost of solar declines.

Verengo has grown 700% over the past four years and has added 900 new employees over that period.