Get matched with top thermostat installers and replacers in Orinda, CA

"Anthony was on time and worked solid until the job was completed. I asked him for advice on other electrical matters and he gave me a positive response and suggestions pertaining to them. He did the work very efficiently and was professional."

"Didn’t get to finish due to a part cracked"

"Yes withholding until certainty it's fix"

"Josh helped set up my AC unit . He is very professional and very detail-oriented with his installations. I will definitely call him up again when I need some home repairs/installations done. Very happy with his work!"

"The job was done well and the system has worked perfectly. "

"Very professional and prompt same day service. Thanks Daniel."

We take great pride in our experience, expertise, quality and customer service that we provide to meet the consumers? needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety and quality, regardless of how large or small the job.

"Very well!"

"Timely, tidy, willing to cooperate, happy with the result. Very happy!"

Since 1999, Hassler Heating and Air Conditioning has helped East Bay homeowners stay comfortable with energy-efficient heating and cooling solutions built to last. We specialize in full system replacements, heat pumps, ductless mini-splits, and high-performance home upgrades designed to lower energy costs and improve year-round comfort.\n\nHomeowners choose Hassler for honest recommendations, expert system design, and clean, professional installations. Whether you need a fast repair or a complete system upgrade, our team focuses on long-term solutions—not quick fixes.\n\nServing Alameda, Contra Costa, and Marin counties, we’re committed to doing the job right the first time, with quality workmanship you can trust.\n\nCall today for expert service and a smarter, more efficient home.