Larsen Energy Systems is your premier Sonoma and Marin county air conditioning and heating service specialist. Santa Rosa's best HVAC Service is a family owned and operated business with over 50 years of experience. You can count on us for honesty, attention to detail, quality care with every job. We only recommend top quality parts, providing our clients the best service and products available. If you need help with your furnace, air conditioning and/or ventilation system, choose Larsen Energy Systems. No Compromise, The Best Period.