Mark came out to provide us with a quote and I told him our AC was not working. He was able to fix it so it would run prior to installing a new HVAC system and did not charge us for the initial visit! His wife, Shari was very nice and she does the business side of the company and also does some install work as well! He spent several days and had to take a wall out that was blocking the heater and he did this and was able to replace it after the new heater was installed. We discussed several options on heaters and also heat pumps and we decided to stay with a conventional gas heater and slim line AC, both made by Bryant. He did a wonderful job , he was also very neat. He was here when the state inspector came and will come back when the City of Windsor comes to sign off and also do his inspection! His pricing was very reasonable for the work needed to do the job! We recommend and will continue to use Mark Constantini! read more

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Mark is great! This is the only place to call for HVAC assistance of any kind. Installed a mini-split in my home. Fantastic job, affordable, professional. read more

Mark Constantini did an excellent job replacing my gas furnace and air conditioner. He is trustworthy and will let you know if a simple repair is sufficient. read more

mark and staff went out of their way to help us resolve our ac issue. thank y0u! richard santa rosa read more

I feel this review was long due. If you have any needs related to HVAC, Mark is your guy. He installed a brand new Furance, AC including the complete overhaul of 40 years old duct work for us. He is very reasonable, honest, reliable and fairly priced. He did a super clean and great job. He is super prompt and never beats around the bush. He is our HVAC person for life. read more

Mark Constantini came to service our broken furnace the same day I phoned him; he made a temporary fix and then ordered the part and repaired it permanently on a second visit; all in the same week--and all very reasonable and was also concerned about our having heat during this really cold period!! A great local company with a conscience!!! read more

Thanks so much to Mark Constantini for saving me thousands of dollars - really! I had another company come out to service my AC and they found some melted wires in the unit and said I needed to replace the entire unit for approximately $8K. I decided to get another opinion and based on reviews on Yelp and neighbor recommendations, I called Mark. He came out the next day, said my unit was fine and actually quite upscale. He said he could just replace the burned out circuit board - which he did a few days later after he got the part - at the cost of $342. I felt like I'd won the lottery! Thanks Mark for your honesty, timeliness and overall helpfulness! We will also use you in the future! read more

Wish I could give more stars. Mark is amazing. He kept my old AC running for three years. Finally it was time. He had replaced my furnace so I knew he was great. He put the new AC in and it is perfect. The important thing is he is fair, personable, kind, professional and competent. I cannot say enough about him and I forget the name of the man who works with him (?Alden) is fantastic as well. Clean-up perfect. I am very picky about who does work for me and Mark is superb and friendly. Kathie Weston read more

We have a 35 year-old Carrier AC that still works great. When the controller board failed, rather than insisting on replacing the unit Mark bypassed it explaining that our new thermostat control in the house duplicated the control function and the external controller was now redundant. Super competent, super honest, the only HVAC company I'll be calling in the future! read more

So I'm going to echo everything that's been said here about Mark's professionalism, skill, communication, and I'll add generosity & grace. How often can you add your highest praise for the work and interaction when someone comes out to your house to fix something? Exactly. 10 STARS! read more

Alden was amazing, incredibly professional, exceptional workmanship. He was incredibly efficient, and cordial. These guys stand by their work and saved me from the heat wave. Recommended 100%. read more

Mark Contantini has been at it for a long time, and it shows. You know you're going to get a quality product at a good price when you hire someone who's local and does the work himself. Mark replaced my old HVAC system with a brand new furnace and heat pump. You can't go wrong with Constantini's. read more

Called Mark for a second opinion to repair AC not turning on. Original diagnosis called for a controller board replacement costing $900. Mark, after spending maybe ten minutes inspecting cabling, reinserted one wire and system started working again. What more can be said? read more

I asked a few friends around the neighborhood about who they would recommend as a reputable furnace and AC installer, and the name Mark Constantini was mentioned a few times. He has a great reputation for quality installations, reliability, maintenance, and offers reasonable prices. I asked him to install my furnace/AC. He did an excellent job and was easy to work with. The system worked fine as soon as it was turned on, and I can tell that he had pride in his workmanship. I highly recommend him. read more

Constantini installed our forced air heating years ago and installed the air conditioner this week. Mark did an excellent job and the quote I received was reasonable. I Consider Constantini's my first choice for heating and air conditioning in Santa Rosa. J. Sheff, Oakmont read more

So happy we had Mark Constantini install our air conditioning! We could not be happier! From the moment we contacted his company, to the return calls, how quick we received the estimate, to the time frame he gave (he actually completed the job early!) He left the work area immaculate as well! He was so professional, very communicative, and it was amazing experience! We highly recommend him!! Thank you!! read more

I've used Contstantini a couple of times over the years to work on the hvac systems I have at different properties. Mark has always been prompt and reliable when it comes to scheduling an appointment. More importantly, he'll give you an honest diagnosis of the problem and charges a very fair rate for his labor. I've never had him try to up-sell me on extra services, or push for a new unit if the parts on an older one can be fixed. While other guys might have a team of technicians (some good, some not!), you can be confident that Mark will be the one on the job. read more

We had 2 roof leaks over the weekend, so we thought. The roofer who showed up on Monday morning said that leaks were from the gap between Vents & the roof, and charged $250.00 for the repair. As he is ready to leave, my wife realized there still was drips from one of the spots on the ceiling. Long story short, he found that it was from busted furnace condensation pipe in the attic. We called Mark Constantini who once worked on my A/C. Not only did he replace the leaking pipe, he & his assistant Alden also located 2nd furnace (I did not even know its existence) above a closet and cleaned/tested the unit. His fee was very reasonable. It gets even better. "AFTER" collecting the fee, Alden went up to the roof to make sure there would not be leaks from the vents of furnaces they worked on. That made me speechless & prompted me to write this review. WOW!!!!! read more

If I could give more stars, I would. Mark Constantini squeezed me into a busy schedule to help me out and get my Santa Rosa 19 year old heater working again & tuned up. Everything got put in order quickly & efficiently, he gave me some helpful tips, a new air filter, and he was on his way. He's a very down to earth, knowledgeable & trustworthy craftsman with years of experience. Very highly recommended. read more

If you are looking for a HVAC Company that provides Outstanding Customer Service call Mark Constantini. Mark has provided us with Excellent customer service and positive results over the years. Whether it is a service call for older equipment or for an installation of a New Air Conditioner & Furnace System "I HIGHLY RECOMMEND Constantini's Heating and Air Conditioning" Prompt Response Time, Competitive Prices, Professional Reliable & Personable Service is what you can always count on. It was 102° here today, and our 5 year old A/C quit. I called Mark and he was on site in under a 1/2 hour. He quickly found the cause of the problem (a bug got in one of the electric contacts) and had our system up and running again. That's what I call Service! read more

Prompt, polite, professional, friendly, and most important REPAIRED my heater. This only happens today, when the service provider has deep knowledge, and wants my business for life. Thank you for your professionalism and for helping me. I AM YOUR CUSTOMER FOR LIFE Jeff Cast read more

Mark came out at 7:30 at night to fix my air conditioner that broke in the middle of all the smoke and fires. He was polite, masked, and got right to work to fix my AC. Very fair price. If I could give 10 stars I would. I have only heard the best about Constantini's and I totally agree. read more

We cannot overstate how pleased we were with the response and service we recently received from Mark Constantini. After reading his glowing reviews, we called Mark when our air conditioner went out during a recent heat wave; he was at our house within an hour, fixed the problem, and explained to us what he had done to remedy the situation. His charge was quite reasonable, as well. read more

Mark Constantini was on-time, courteous, COVID19 - safe, wore shoe covers in the house and quickly figured out that my "failing" HVAC was actually a small piece of insulation that was jamming the upstairs zone baffle motor. Saved me thousands. Highly recommended! read more

I selected this service provider without a great deal of exposure to similar businesses and for once the luck of the draw paid off. They made the necessary repairs promptly and when they could easily have recommended a major replacement they effected a simple repair. Trustworthy and competent has earned this company my future business when that time comes. I hope to see him out for breakfast one of these days so I can buy the meal to thank him for the help during one of the hottest streaks in memory. read more

Mark is amazing! He is prompt, does an excellent job at fair prices and there are never any surprises with him...just delight at a job well done. We've used him on 2 occasions, once to replace a heater and once for the air conditioner. Both times we were impressed with his competence, friendliness and efficiency. He's a hard worker who obviously takes great pride in his work. I can't recommend him highly enough. read more

I had a heating malfunction and called Constantini, whom I have used in the past. Everything from the person on the phone through the service call by Mark Constantini was first class. Mark is profession and confident in his work. He gives you a feeling of confidence in his workmanship. On top of it all his rates are reasonable. I will continue to use Constantini for my routine maintenance and problem needs. I highly recommend them! read more

My husband and I have wanted an HVAC in our house for 10 years. After getting a couple quotes, we chose Mark as per great referrals from Nextdoor.com and for his prompt quote. As already stated in prior reviews, I can't recommend Mark enough. He is the perfect example of superb customer service, promptness (he came on our schedule), and is an extremely hard worker. He is down to earth, informative, easy to deal with, and did an excellent (and CLEAN) job with the install. He even custom built a base for the heater, upgrading the previously installed unit. After all said and done, the next day my husband decided to upgrade to a fancy thermostat, and Mark came that night to help us install it. Thanks again Mark, and to his wife Shari for helping and being so sweet. read more

Based on great reviews on NextDoor, I called Mark Constantini to come do a checkup on our 19 year old furnace and air conditioner in late Sept. and got a very reasonable estimate for a service call. He was scheduled to come out on Oct 9th, the day of the horrible firestorm. When I called his service on the 9th to tell them I didn't know if our home in Rincon Valley had survived (we went to So. Sonoma County after we were evacuated and thankfully the house was safe), he called right back and said he was helping his family evacuate, but would get back to me. He has called twice (our schedules didn't mesh) and finally was able to make it out, as planned, on time. I was so impressed with the thoroughness of his work, the fact that he didn't just write us off because we were a small customer, and the fact that, in spite of caring for his family's fire trauma he was so professional. Highly recommend Mark Constantini, a great service provider and a nice man!! read more

I highly recommend Constantini! They replaced my 30+ year-old furnace (after Mark had earlier come out on the day it quit, which of course was on one of our recent near-freezing days, and got it going again, with the caution that the fix was only temporary) and did a beautiful job--they were professional, friendly, helpful and super clean! I went with the 95% efficient model and love it!! read more