At Larsen Energy Systems, we know that you don't just need a well-functioning HVAC system—you need to feel confident that your system is in good hands. That's why we're here for you. Established in the early 70s as “AAA Energy”, we span decades of excellent results and a wide county framework, while consistently providing a broader, satisfied business and customer base. AAA Energy in its third generation was expanded and rebranded “Larsen Energy Systems” in 2009. We are a premier Sonoma and Marin county residential and commercial air conditioning and heating service specialist. You can count on us for honesty, attention to detail, and quality care with every job. We only recommend top-quality parts, providing our clients with the best service and products available. If you need help with your furnace, Santa Rosa air conditioning, and/or ventilation system, we can help. We are Santa Rosa's best HVAC service provider, family-owned and operated with over 50 years of experience.