Quick-growing Southern California contractor expands to Sonoma County

A fast-growing Southern California construction company has expanded into Sonoma County, serving a market familiar to the founder.

San Diego-based Same Day Heating, Cooling, Plumbing opened a second location in Windsor in January, according to an announcement Friday. The 5,000-square-foot location at 600 American Way employs 22 people, the company told the Business Journal.

Owner Jonathan Winterstellar was general manager of One Hour Heating & Air Conditioning in Santa Rosa for a year and later held the same position for four and a half years at the company now called Moore Home Services, also in Santa Rosa, the Journal reported. He founded Same Day in early 2019 in his hometown of San Diego and left Moore shortly after it was acquired by a private equity fund in 2019, according to the press release and Journal reporting.

“I am thrilled to be back in the North Bay, a region I know and love,” Wintersteller said in the announcement. “At Same Day, we're not just about providing service; we want to create a different culture in the HVAC industry. Our focus is on building personal relationships with our customers and creating a work environment where our team is valued. I look forward to bringing that ethos to the North Bay region.”

Same Day ranked 84th on Inc. magazine's list of fastest-growing independent companies in the Pacific Rim in 2024, with revenue growth of 165% during 2021-2023. With the new Windsor location, the company employs 94 people.

Moore made the Inc. 5000 list for the sixth and final time in 2019, ranking 1,999th with three-year revenue growth of 201%. He finished 2018 with revenue of $27.6 million and 140 employees, the Journal reported.

The company is led by President and CEO Zachary Johnson, who most recently served as general manager for Republic Services' California and Utah operations, according to Same Day. Johnson holds a master's degree in sports management and an MBA from the University of Michigan.

Jeff Quackenbush covers wine, construction and real estate. Reach him at or 707-521-4256.

Correction, March 12, 2024: Jonathan Winterstellar's name was misspelled.

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