Serving Berkeley, Oakland, and Alameda, Contra Costa, and Marin Counties!

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Hassler is committed to delivering safe and reliable service to our customers during the ongoing COVID-19 pandemic.

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Energy Assessment

thermal imaging inside building

Looking for an energy audit company near you? An energy assessment from the team at Hassler will determine if air sealing the attic, insulating the basement wall, or upgrading your appliances will have the most impact on your energy bills. Hassler provides energy assessments throughout California's East Bay.

The BayREN Home+ Rebate Program and Heat Pump Rebates

berkeley california residential home

This program is for homeowners throughout Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, and Sonoma. The goal is for homeowners to better understand their home performance and energy saving potential through heating and cooling upgrades.

Service Area

Hassler Heating and Air Conditioning expert staff are always ready to provide a fast and efficient response to your heating and air conditioning needs in the following East Bay areas.

Heat Pump Electrification

Heat pump outside next to house

Learn why heat pump installation is so important for the all-electric home, and how they compare to other home heating and cooling systems. Hassler Heating and AC provides expert heat pump and ductless mini split installation throughout Marin, Alameda, and Contra Costa counties.

Help reduce airborne viruses and other pathogens in the home.

Please contact us for more information at 510-848-3030 or using the form below.

I'm writing to thank you for your work in providing air conditioning for my house. Given the particular structure and setting of this modernist, flat-roofed house, with its open rooms and glass walls, it was unclear what type of system would work here. You guided me to the ductless, split system... Read More

Marilyn B., Kensington CA

Hassler Heating went above and beyond customer service! My AC unit started smoking and I called to make an appointment and they were able to fit me into their schedule that day! Derrick Easton was the technician and he arrives 15 minutes before the appointment and was professional and even... Read More

Emily V., Concord, CA

The condenser unit at our house went out the Sunday before Labor Day, just before a week of 100 degree days. I called Hassler and was surprised to have someone pick up the phone, and happy to be able to schedule a next day appointment. Mike came today, was right on time, and quickly... Read More

Scott L., Lafayette, CA

The company provided great service. Tony Falsette serviced my air conditioner today. He quickly identified the problem, took time to explain it, answered my questions and got everything in working order under 2 hours that even included a trip back to El Cerrito to get the right part. He... Read More

Veronica A., Hercules, CA

Chris just came out and inspected a furnace and ducting for me at a property that clients of mine are purchasing in El Cerrito. He was very knowledgable and was sure to take the time to answer all of my questions thoroughly. I would definitely use Hassler again based on the service he... Read More

Jeffery S., Walnut Creek, CA

"My wife and I moved to the area buying a townhouse in 2010, with a twenty-one year old gas furnace. Each heating season we had problems with the furnace, with a couple of different HVAC companies replacing parts, but with the problem soon recurring. In February 2014 we had Hassler work on... Read More

Tom R., San Rafael

"We've had our central heating die twice since 1991 - and of course, both times it was right when the Bay Area got socked by those rare two-week Alaskan freezes! Hassler was booked solid, not surprisingly, but Jackie gave us an appt six days out, so we huddled near portable heaters and... Read More

Jean K., Oakland, CA

"Great service. After installing the system two years ago, they called me to setup a follow-up maintenance check. Chris is a very professional and courteous person and great to work with."

... Read More
Albert W., Oakland, CA

I chose Hassler HVAC after talking to a few HVAC & insulation contractors about upgrading my house's insulation, heating, and water heater. These guys looked at the whole picture, gave great options & suggestions, had fair prices, and were always professional. They squeezed a whole... Read More

Sean M., Oakland, CA

"Hassler HVAC: quick diagnosis and a quick fix. Derrick is "The Man". Quick diagnosis (less than 20 minutes) of a problem that turned out to be simple, but not at all obvious. Quick repair (less than 40 minutes).
Polite, courteous. Clear explanations of the problems and the... Read More

Bertram T., Oakland, CA

"The only good thing about all that rust in my water was calling Hassler. I got a new tank for a decent price and great customer service. The install took longer than expected because whoever installed the last one did some very odd things. But Hassler stuck to their estimate. 
... Read More

Daniel S., Albany, CA

"Hired Mike to replace a heater and install a new air conditioner. The team did an outstanding job. They were professional, reliable, dependable, fast and left the area cleaner than when they started. Any questions I had after installation were answered quickly and they even came out to... Read More

Leila R., Berkeley, CA

"Hassler replaced our entire house heating system and was one of the best companies we have ever hired for anything. Just great and so considerate and professional. Every contact was excellent, each employee was helpful and informative. They are true problem "solvers". We installed an... Read More

Carol L., El Cerrito, CA

"Hassler Heating has always done a great job whenever I needed to call them. They are the only company I would call to service our Heating/AC unit. Paul came out yesterday to service our AC unit, he gave me a call ahead of time to let me know his ETA. He was very professional &... Read More

J.P., Berkeley, CA

Hassler Heating is a terrific company! Their skills, professionalism, teamwork, and efficiency exceeded anything I could have imagined. Everyone I met was skilled, pleasant, competent and really committed to doing a great job.  I am so happy with our new furnace and duct work and our new... Read More

Debbie G., Richmond, CA

Just completed first annual inspection. Chris was professional, responsive, timely, and easy to work with. 
I really like the annual maintenance program. No worrying about changing a filter or keeping this important piece of equipment running an extended... Read More

Chris E., Berkeley, CA

Hassler Heating and AC really pulled through for me. I'm a landlord and one of my tenants reported that the HVAC system went completely out right during the hottest week of the year. Hassler Heating and AC was very responsive and understood my sense of urgency to respond to my tenant... Read More

Chris K., San Francisco, CA

Just got our central heating put in and it has been an excellent experience thus far. For the majority of the install process had Max and Edgar at the site and they were extremely professional, courteous, clean, and on time. Max would consult me on any part of the project that was anything... Read More

David P., San Diego, CA

Fantastic company to work with, great service & reasonable prices! We moved into our current place & the air conditioning conked off within weeks! We interviewed & got quotes from several companies, Hassler gave us the best deal by far.

Divya K., Belmont, CA

They took out our wall furnaces and installed an energy efficient 2 zone heating system. Mike explained his whole process step by step and provided me with many options. I was very pleased with the work they did and would recommend them to anyone.

John, California

Mike, apparently Rene and your team did such a good job the rebate is even a bit higher than expected. Thanks for the good work.  Your commitment to qualifying and getting the rebate was a key factor of why my wife and I chose your company for the installation over other companies... Read More

David G., Berkeley, CA

....Mike impressed me with his professionalism, attention to detail, and his ability to explain clearly what my options were and how the furnace installation would be performed. His bid price was competitive, too.

Don K., San Francisco, CA

Our Services

  • Hassler specializes in cost-effective, energy efficient heating services, including furnace...

  • Want to achieve maximize indoor comfort, energy efficiency, and energy bill savings with your...

  • Are you suffering from allergy like symptoms in your own home? Hassler's indoor air quality team...

  • Looking for an energy audit company near you? An energy assessment from the team at Hassler will...

  • Preventive maintenance and fast repairs are essential if you want to get the most from your...

  • Just like your car, your heating and AC systems need regular maintenance and repairs to operate...

  • With features like smartphone control and custom temperatures for different times of the day, a...

  • An efficient water heater can have a major impact on home energy consumption, providing...

  • Heat pumps are a cost effective way to heat your home in the winter months — and they can cool...

  • Keep your employees comfortable, & your monthly heating and cooling expenses at a minimum...

  • Protect your home from outside contaminants, and uncomfortable temperatures when you seal up the...

  • Traditional water heaters use electricity or combustion to create the heat that is then...

Why Choose Hassler

The latest from the Hassler Blog

Still from Hassler Videographic "California's All-Electric Future"
Watch and learn how California is transitioning to using clean electricity instead of fossil fuels to keep our homes comfortable. Hassler Heating & AC is a home heating and cooling contractor in...
Screenshot from Hassler Videographic "Ways to Keep Comfortable in the East Bay"
Watch this video to learn about some of the common problems and solutions for East Bay homeowners looking to keep their homes cool, while keeping heating and cooling costs low. Schedule AC...
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BayRen+ Home Rebate Program