Larsen Energy Systems provides furnace repair & replacement service throughout Sonoma County. Wearing your favorite Irish wool sweater and cuddling under a blanket with a cup of hot cocoa sounds relaxing and romantic on an occasional cool night, right? When you start bundling up every winter evening out of necessity because your furnace is no longer working, this isn’t so fun anymore. Your utility bills will inevitably go up too if your furnace is struggling to keep your home heated.

Save the sweater for a special occasion, and call Larsen Energy Systems to repair or upgrade your heating system.


Larsen Energy Systems’ technicians service all of Sonoma County and the surrounding area, including Santa Rosa, Rohnert Park, Petaluma, Skyhawk, and Marin County to provide maintenance, repairs, and new installations for your furnace and air conditioning systems or heat pumps.

We are a local, family-owned and operated business with over ten years of experience in the HVAC industry. Our full-service team offers repairs and install customized ductwork. We are experts in the overall ventilation of your home. We are qualified to provide both commercial and residential services, you can depend on us to meet your HVAC needs.


While it is possible to replace the air conditioner without getting a new furnace, there are several reasons why you might want to replace your heating system while updating your cooling. It’s cost-effective to replace both at once and could save you thousands of dollars in the long run. Another reason is that they both use the furnace’s blower. If the blower is older than the AC, you may not get the full efficiency of your newer, more energy-efficient air conditioner, and the utility bill savings you were expecting from the new AC might not happen. The mismatch could cause less than the best performance from your AC, cause it to break, or decrease its lifespan. If your furnace is 10/15 years or older, it is probably a good idea to change out both at the same time.

Many factors affect replacement costs. The size of your business or home will dictate the size of furnace/air conditioner you will need. If you currently have a unit that is either too small/big to efficiently heat your home, you’re most likely paying more in utility bills and sacrificing comfort. We’ll recommend the correct, precise sizing for your dwelling that will get the job done (the location and accessibility of your equipment can affect installation cost). The quality of existing ductwork must be in good condition and sizing must also be correct to work seamless with the new system. Call or email Larsen Energy Systems for a quote and to discuss how your available options affect the price.

There are several things to consider when making the decision of whether to repair or replace your furnace. If the furnace repair cost will be over 30% more of replacement cost, then going with a new furnace is the right choice. Other signs of an expired furnace is needing frequent repairs or showing visible signs of wear, such as loud noises, excessive rust, or a flame that burns yellow instead of blue, you need a total replacement instead of postponing the inevitable and wasting more time/money on repairs.  Is it keeping you warm and comfortable on even the coldest days? Is your utility bill higher than all the neighbors during the winter?  Could you save enough money with a newer, more energy-efficient heating system? And are there energy credits or rebates available to help cover the cost? Larsen Energy Systems can help you answer these questions and give you an honest assessment of the best plan for your furnace.

Serving Sonoma County with over ten years of HVAC experience, Larsen Energy Systems is a local, independent, family-owned and operated business. We are professionally licensed and fully bonded and insured. We care about our customers and want to help them get the best HVAC system and performance for their money. We are also a full-service HVAC team that can repair a wide variety of make/models or install your entire system, including customized ductwork if needed. We provide free estimates for installation jobs, and we are available for emergency repair services. We help you keep your systems running with regularly scheduled, professional maintenance services. For total comfort and satisfaction, call the pro’s at Larsen Energy Systems today!

Is your furnace broken? Noisy? Tends to break every year? We can help.