24 Hour Emergency Service Serving the greater Milford area

It’s Mitsubishi Electric Trane US Monday time!

Check out this Ductless swap out in Hamden (They had an LG, not pictured). The new Mitsubishi units are very quiet and will save $ on Utility bills. Give us a call at 203-301-4151 today! Rebates may apply


New Local Job!

Check out this Masterpiece we installed in Trumbull, CT. Give us a call at 203-301-4151 for a FREE quote on any Heating, Cooling or Ductless System. $500.00 off until the end of the month!


It’s Mitsubishi Monday time!

We recently installed this new ductless system in New Haven, CT. What is the advantage of ductless air conditioning? A ductless AC is able to distribute cold or warm air more evenly and efficiently than traditional units, resulting in a more comfortable temperature throughout the home.


It’s Mitsubishi Electric Trane US time!

Imagine every room with an individual level of comfort. It’s possible with a multi-zone mini-split system. Mini-split heat pumps are energy-efficient, reliable, and environmentally friendly solutions to improve your home’s comfort while minimizing utility costs and emissions.


Out with the old and in with the new!

Check out this amazing Gas Combi Boiler and Bryant Central AC swap out in Trumbull. Give us a call to set up a free quote on any heating, cooling or ductless install 203-301-4151.


New Local Job!

Check out this new Lochinvar Boiler we installed in Milford, CT. Give us a call for any heating, cooling or ductless system 203-301-4151.


Boiler and Water Heater installed in Shelton!

Check out this Oil Weil Mclain Boiler and Water Heater installed in Shelton! Give us a call for a FREE quote today 203-301-4151.


It’s Mitsubishi Electric Trane US Mitsubishi Monday time!

Check out this AWESOME Ductless System in Clinton, CT. Save $$ on utility bills and keep each room set to what you want! Give us a call at 203-301-4151 for a free quote today!


Water Heater Swap Out in North Haven!

Check out this awesome Bryant Gas Furnace and Navien Wall Hung Water Heater Swap Out in North Haven! Saves money on utility bills, room in the basement and so much more efficient! Give us a call at 203-301-4151 for a FREE quote on any Heating, Cooling or Ductless systems!


It’s Mitsubishi Monday time!

Check out this AWESOME Mitsubishi Electric Trane US installed in Clinton, CT. Give us a call at 203-301-4151 for a free quote today!


Gas Boiler swap in Norwalk, CT

Check out this Gas Boiler swap in Norwalk, CT. Our customer is so happy to have a NEW more efficient Lochinvar boiler. It will save him money and is super quiet. Give us a call for any new heating, cooling to ductless install before it gets to cold 203-301-4151!


Its Mitsubishi Monday time again!!!

Check out this very talented Mitsubishi Ductless Install in Naugatuck. The picture says it all! Give us a call at 203-301-4151 for any heating, cooling or ductless quotes!


It’s that time again………….That’s right Mitsubishi Monday!!!!

Check out this awesome Ductless Install done in Trumbull, CT. Give us a
call at 203-301-4151 for a FREE quote on any heating, cooling or ductless system!


Guess what time it is…That’s right Mitsubishi Monday!

Check out this install in Bethany, CT. Give us a call at 203-301-4151 for
any Ductless, Heating or Cooling needs!


Oil to Gas Conversion in Branford, CT!

Check out this awesome oil to gas conversion in Branford, CT. This new Navien Gas Boiler is much more efficient and will save our customer $$ on Utilities. Give us a call at 203-301-4151 to set up a FREE quote on any new Heating, Cooling or Ductless System.


Mitsubishi Monday is back!

Check out this awesome Ductless job in Stratford. Give us a call at 203-301-4151 to setup a free quote today!


Air Conditioning Installation in Clinton, CT

Check out this install in Clinton, CT. A new Bosch AC system. Great balance of efficiency and comfort! This system is super quiet and will save money all year! Give us a call for a free quote 203-301-4151.


Ductless HVAC Installation in West Haven, CT

This time we went to West Haven, CT. These systems use less energy which will save on utility bills. They are super quiet and offer zoned comfort control. Rebates and special financing for those who qualify. Give us a call at 203-301-4151 for a free quote today!


Oil to Gas Conversion in Milford, CT

Finished up an Oil to Gas Conversion here in Milford. Check out the before and after pictures! Saves space and money on utility bills. Give us a call at 203-301-4151 for a free quote on any Air Conditioning, Heating or Ductless System!


Air Conditioning Installation in Fairfield, CT

Time to start thinking about Air Conditioning! We installed the new AC in Fairfield last week! Thomas will be saving on his utility bills and be cool all summer!


Ductless HVAC Installation in East Lyme, CT

Cold weather can take a toll on the efficiency of your heating and cooling system and the comfort of your home. Mitsubishi Electric can help. Whether you have a single room that’s too hot or too cold, a home that needs a new heating system or anything in between, we have a solution that will work for you.


Hydro Air Heating & Cooling Unit Installation in Westport, CT

Utility bills will be lower and our customer will be cool on that first hot ☀️ Day! Give us a call at 203-301-4151 for a FREE quote today.


Gas Boiler Replacement in Milford, CT

We replaced an old Utica Gas boiler and water heater with a new Navien Combi (Heat and Hot water) Gas Boiler. Customer can look forward to savings in his Utility Bills!


Gas Furnace Replacement in Branford, CT

So much quieter and more efficient. Check out the before and after pictures!


Ductless HVAC Installation in Naugatuck, CT

Mitsubishi Mistusbishi everywhere…..
Save money on Utility bills and still stay cool all Summer!
Give us a call for a free quote and stay cool this summer!


Gas Boiler Installation in Guilford, CT

Check out this Navien Combi Gas Boiler we installed for our Customer Susan last week in Guilford!
She loves it already, especially the On-Demand hot water! Give us a call at 203-301-4151 for a quote on ANY Heating, Cooling or Ductless System!


Local Furnace Installation Projects in Stratford, CT | Ductless HVAC Installation Projects East Haven, CT | Local AC Installation Projects Orange, CT

Boiler Installation Projects, Local Furnace Installation Projects & Ductless HVAC Installation Projects Milford, CT, Orange, CT, West Haven, CT, Woodbridge, CT, Trumbull, CT & East Haven, CT

Oil To Gas Conversion ProjectsBoiler Installation ProjectsLocal AC Installation ProjectsLocal Furnace Installation ProjectsDuctless HVAC Installation Projects ∴ East Haven, CT ∴ Orange, CT ∴ West Haven, CT

Reviews & Testimonials

Customer satisfaction is our #1 priority

Explore All Reviews

They were both very professional, informative and very neat and went out of their way to any other issues. I highly recommend them and hope their service lives up to the same.

John T.

The technician was very polite. He assessed the situation quickly but thoroughly and provided a honest diagnoses. He told me exactly what was wrong and needed to be done and he performed the job well because everything is working perfectly. I will call them for my future needs and recommend them if you do not have a HVAC provider.

Theandra T.

This company was an absolute joy to deal with helping me switch from oil to gas and taking care of every step of the process, from sales to installation to dealing with gas company. Kelly is a gem. Can not recommend enough!

Terri M.

Had to change the zoning board, wiring to HVAC and thermostats on an 30 year old system . Responsive, on time arrival, fair pricing – true professionals. Was absolute pleasure to see how their engineer arrived on time, communicated everything he has done, and the work performed. Will definitely contact them again for anything HVAC related.


Anthony, Mark, and Kelly have helped install, fix and maintain our furnace and AC units for many years now — they are the best, and yes, we have tried the rest. But we will always call Onofreo from now on. Excellent work, done fast and reasonable rates — great people too.

John B.

Excellent service and quick response. Also had what I thought was a leaking hot water heater but turned out something far less expensive. They responded back quickly and had everything finalized within 2 hours of my initial contact with their office

James V.

Onofreo has proven themselves yet again to be the best in the business. My wife and I went to them a second time, this time to replace our Central AC unit. First of all, they came right out to inspect, then they gave us a price that was much lower than I had expected. The install happened very quickly and everything is perfect. Mark and his team are absolutely wonderful and I can’t recommend them highly enough. Truly a first class company all around. If you need work done, this is where you should start. Thank you for another great experience!

Joe B.

Amazing to experience an oil to gas conversion with Onofreo! Efficient, fast, and beautiful work!!

Melissa B.

In short, I could not be any more pleased and satisfied. You started the process with an excellent presentation, great salesmanship skills, and more than enough knowledge to allay any concerns I had. With your guidance, I believe we put together a system that will continue to meet my needs for years to come. I am particularly impressed with the Rudd heat pump water heater. But for your recommendation, I might have stuck with the standard 50 year old technology and heated water with gas or electric. Now that I have seen the heat pump water heater in action, going with the old technology would have been a big mistake. Thank you.

Scott O.

Onofreo is an amazing company That is represented by excellent products and professional staff. When I first called them they were extremely responsive to my needs and took care of the initial concerns that I had with an old air conditioning system.

John S.

Everyone in the office I spoke with was so friendly and responsive. They called to notify me that the technician was running late, so I wasn’t sitting around waiting.
Our Technician, Giovanni, was excellent.

Ellen L.

Onofreo Home Comfort Systems LLC installed a new ductless, mini-split air conditioning system in our home. Very completive pricing when compared with other area contractors.

Nick N.

The install was well planned and started on scheduled date. It required multiple condensers and 4 wall mounted units. The team was friendly, professional and worked non-stop through two very hot days directly in the sun. The install finished ahead of schedule. Cabling is very neat. Team cleaned up when finished. So, start to finish just as promised. The Mitsubishi units work very well and are extremely quiet. An overall A+!

Jeffery B.

Mark and his team are the best. They are honest, transparent, hard working, professional and punctual. They answer all of your questions, even the dumb ones, and I had plenty of those. They removed my antique furnace and installed a complete heating system in 2 days as promised as well as a hot water heater on an emergency basis. They also wear masks. Call them. You won’t be disappointed.

Elaine M.

We recently had to replace our central Air Conditioning and received estimate from various HVAC specialists, including the one we currently have a service contract with. Shane, the sales constant, was by far the most professional, patient, kind, honest, and thorough person that I met with.

Christine K.

I had Onofreo HCS install a new Hydro-air system last year to replace my 35 year old system that kept giving me trouble – Mark, his office staff, and his techs were prompt, professional, and clean. Mark showed up to do his estimate, I got the proposal signed, they pulled the permit, dropped off a check, and in three days I had a brand new system installed. I knew what was going on every step. The install looks great and they provided free cleaning and tune up service afterward. I have also referred my mom to them and she was thrilled with the service. I would highly recommend anyone who needs maintenance or a new system to Onofreo HCS.

Eric P.

Bravo to Pat from Onofreo! He walked me through all the service needs for my hot water heater and heating ducts & vents. An overall fantastic experience and I will be calling Onofreo HCS for all future HVAC needs. Thank you 🙂

Carmen F.

The installation was installed neatly on the date scheduled and at a terrific price. We are completely happy with the professionally executed work.

Michael L.

I had an issue with hot water system. They were very fast to send someone out on the same day to diagnose the problem and quickly got in parts the next day to complete the job. Kept me closely updated on when a repair person would come to my place. Very happy I can shower again with hot water!

Monkol L.

We just had a ductless split unit system installed in 4 rooms of our house. The people at Onofreo are amazing to work with, from the owner Mark, to the office staff to the guys coming out and doing the work. The install happened much quicker than I anticipated and they were SO clean, I would have never known they were in my house cutting into walls, etc. The system itself is awesome – very quiet and cools down the house super quick. When Tom came for the consult, he told me I’d never want to leave the house again and he was right. Best thing we ever did! Thank you Onofreo!

Heather D.

Just amazing people even helped me with rebate paperwork from my electric company.Will use them again and so should everyone else.

Ralph S.

Anthony called prior to the visit. Arrived on time & found a capacitor was bad on our compressor. He went on to check the entire system to make sure it was running right, without me having to ask. Very friendly & explained everything he was doing. Kelly was also very pleasant to deal with on the phone.

Wayne S.

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