
Serving Sebastopol, CA and surrounding areas
Approved
In business since 2013
Free estimates
Credit card accepted
"Charlie was fast and efficient. I have had him for two projects."


Serving Sebastopol, CA and surrounding areas
Approved
In business since 2013
Free estimates
Credit card accepted
"Charlie was fast and efficient. I have had him for two projects."

Serving Sebastopol, CA and surrounding areas
Approved
Super Service Award Winner
In business since 2023
Free estimates
Credit card accepted
"Chance patiently explained the issue with our broken air conditioner and clearly laid out all of our options. We elected to change out our aging HVAC system and he moved his schedule around to accommodate us. They were punctual and kept us informed every step of the way. The work was thorough, neat as a pin, and came in exactly as quoted even though he hit a few unexpected snags. I know it seems like a small thing, but he and his partner seem to really enjoy their work, and their attitude is upbeat. We would hire them again in a heartbeat!"





+20

Serving Sebastopol, CA and surrounding areas
Approved
In business since 2008
Emergency services offered
Warranties offered
Enviro Heating & Air Conditioning Inc. is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers interests, and make their concerns the basis of our business. \n

Serving Sebastopol, CA and surrounding areas
Approved
In business since 2009
Free estimates
Emergency services offered
"Excellent all around. One Hour, the other Marin county heating and air conditioning company tried to rush me into using them at a price that was 2x over market. No rationale for this at all and they just wanted to soak me for a huge price increase. Moore came in at the correct price and no pressure."





+15
Serving Sebastopol, CA and surrounding areas
Approved
In business since 1978
Free estimates
Warranties offered
"Jim's Air Systems had the best value for my dollar. They supplied me with better equipment than they quoted for the same price. They completed the entire installation in about five hours. They protected my floors with tarps and were very careful to protect my walls as they moved equipment in and out. Josh, the son of the original Jim, was on the job working with the other two installers. They performed above my expectations. They left my home and yard as clean as if they had never been there. The new furnace is wonderful and is already saving me money on my P.G. & E. bill. I would recommend Jim's Air Systems unconditionally to anyone in need of a new furnace and AC system. This is a family business that has been supplying and installing systems since 1976. They take personal pride in doing an excellent job. They did not sell me anything that I did not need and provided me with a much cleaner and easier-to-service installation than my existing system. They are the best!"

Serving Sebastopol, CA and surrounding areas
Approved
In business since 2025
Free estimates
Warranties offered
"Green Core HVAC was awesome to work with! The team did a great job helping us pick the perfect AC unit for our home. They showed up on time, got the new AC installed quickly, and left the place spotless. Our house is cooler and more comfortable than it’s ever been. You can tell these guys really care about doing a great job. I’d 100% recommend Green Core to anyone needing AC work. Super professional, super friendly, and they really know what they’re doing!"




Serving Sebastopol, CA and surrounding areas
Approved
In business since 2021
Warranties offered
Offers commercial services
"Ricardo was incredibly attentive and punctual. He was very honest about what needed to be done and he arrived on time as agreed upon and did an immaculate job. Would highly recommend him for any heating or air jobs. Thank you, Ricardo, for giving us heat again during this very cold winter!"





Serving Sebastopol, CA and surrounding areas
Approved
In business since 2021
Free estimates
Credit card accepted
"Wolf HVAC did an amazing job on installing and setting up my AC. The owner is very hands on and has a very professional team. They were on time, cleanly and affordable. I will definitely use this company again."

Serving Sebastopol, CA and surrounding areas
Approved
Super Service Award Winner
In business since 1968
Free estimates
Warranties offered
"Bragg Plumbing knew exactly what the issue was and repaired it. They even cleaned the evaporator coil allowing the air inside to be much cooler than before! A+++ rating!"





+1
Serving Sebastopol, CA and surrounding areas
Approved
In business since 2004
Free estimates
Emergency services offered
"I hired Volkman Heating and Air to install a heat pump system for three rooms. That was all I wanted. But, when they were finished, I decided to have them do the rest of the house as well. Anyone can promise you great, professional service. Itâ s rare that they actually deliver everything they promise without compromise. Thanks! Iâ m now ready for the heat of summer to begin."
Most professional HVAC technicians require two to three hours to complete an expansion valve replacement. The timeframe depends on your unit's accessibility and whether additional repairs are needed. The process involves recovering refrigerant, removing the old valve, installing the new component, and recharging the system. Scheduling during less busy seasons may result in more convenient appointment times.
Operating your air conditioner with a malfunctioning expansion valve isn't advisable. Continuing to run the system could potentially damage other components, particularly your compressor, which is significantly more expensive to replace. If you notice performance issues like inconsistent cooling or unusual noises, it's best to have your system inspected before continuing regular use.
Expansion valves don't have a standard replacement schedule, as their longevity depends on system usage, maintenance frequency, and environmental factors. Regular professional maintenance helps identify potential valve issues before they cause system failure. Having your HVAC system serviced annually allows technicians to monitor component condition and recommend preventative replacements when necessary.
Refrigerant leaks require prompt professional attention. If your expansion valve is leaking, you'll likely notice reduced cooling performance and possibly hear hissing sounds near the unit. Addressing leaks quickly prevents further system inefficiency and avoids the environmental impact of released refrigerant. Your HVAC technician will need to repair the leak and recharge the system with the proper refrigerant type and amount.
Because many AC issues present similar symptoms, professional diagnosis is recommended. Problems like inadequate cooling, inconsistent temperatures, or strange noises could indicate expansion valve issues, but might also stem from refrigerant leaks, electrical problems, or airflow restrictions. A qualified HVAC technician has the tools and expertise to accurately identify the root cause and recommend appropriate repairs.
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