C.D. Shanahan's is a fantastic family owned business. We have used them to replace our water heater and a new AC/Furnace unit. Our AC started having issues cooling Thursday night. Called Friday morning and the receptionist was amazing and got someone to our house that morning. Full diagnostic told us the compressor went bad. Our unit was 13 years old, so it was about time for a new system. We decided to replace whole system as replacing a compressor is quite expensive basically half the cost of a new one. Mike came that night to price out a new system. I got two quotes from other companies. But decided on Shanahan because of their reputation, service as well as pricing. Talked with Mike and Conner (the owner) about our options and they came on a Saturday to install even though they didn't have an opening until Thursday. The owner himself came with a couple guys and replaced our system. They were very polite, did excellent work and we were back up and running. Plus they had very affordable pricing. These guys care! Use 'em. We loved our experience from start to finish! read more

C.D. Shanahan's technician visited my place and did diagnostic, but I had move questions about compressor and refrigerant pressure and sent an email to C.D. Shanahan's email after receiving quote. But then I did not have any responses for my questions for a week. Maybe, they are busy and did not read my email yet. Brandon's diagnostic was great, but I am not getting responses for my emails before making my decision. read more

Have nothing but the highest praise for CD Shanahan. Timing for assessment of replacement could not have come at a better time! Inspection and replacement assessment team were extremely knowledgeable of the options available for my late 1980s townhouse. Installation team arrived on time, and the team worked like a well oiled machine to remove failing system and hook me up same day with a fantastic 2 ton TRANE dual stage system with surge protectors on both air handling and outdoor compressor units. If we have brown outs from the wicked storms we had early summer or electric surges from the backlash malfunctioning data centers, we are protected from complete destruction of our HVAC system that could cause a house fire. They offered generous sales incentives and now I have peace of mind. They also offer electrical and plumbing services. Recommend you talk with Shanahan's right away. I lost a lot of time shopping around. Wonderful family owned business. read more

Good experience and customer service. My AC had been knocked out last week by the storm the night before and was able to arrange an appointment in a reasonable amount of time, Tech arrived on time, and it turned out the issue was just a safety switch on the electrical plug associated with the AC unit. So I just paid for the diagnostic fee. Was impressed with their professionalism. read more

We had our water heater replaced by the C.D. Shanahan team. It was a great experience. The scheduled a quick appointment for a quote, quoted a very reasonable price, scheduled the actual work promptly, and delivered a good result. The team was professional and communicated well. I will continue to do business with C.D. Shanahan's HVAC for all our HVAC needs. read more

Connor and his team continue to be the standard in the Industry. They are consistently on time, reliable, reasonably priced, and courteous. They take pride in their work and taking care of customers. CD Shanahans is a top tier service provider in the DC Metro area. Highly recommended! read more

Great experience with CD Shanahan's. Ultimate due diligence and customer service. Never tried to over charge and made sure the job was completed. Scheduling was a breeze and always arrived within the window with a good heads up. Will use again for our heating and AC needs read more

Seemed ok at first, but few days after servicing the thermostat stopped working, AC unit making rattling sounds. They never sent me any pictures of my systems as part of the service either even after reaching out to them. It was an expensive service call to begin with and was hoping it would be worth it. It wasn't. I would not recommend them. read more

C.D. Shanahan’s - Part of AC unit not even completed screwed - Heating & Air Conditioning/HVAC Near Me

New heat pumps in fall 2025. Promised excellent service. In the current heat wave, after hours I called their main number, service number and emergency number and got zero response. They talk a very good game, but they are very small and unable to meet their service commitments. I strongly recommend you stay away from this firm -- they are understaffed and unable to meet their service plan commitments. I will be looking for another HVAC vendor as quickly as possible. read more

We are pleased with the service that C.D. Shanahan's provided. Everything from the initial consultation to the final installation was seamless and professional. All of our questions/concerns were addressed right away and there were never any pushy sales tactics. We highly recommend them and think you would be just as pleased as we are! read more

They could have upsold me when I said I was seeing high CO2 levels in my home. Brandon did a thorough review of my system, finding issues that plumbers from a competitor companies, an energy audit professional, and the house inspector had missed. He addressed the issue and had a strong follow up plan. Troy heard my concerns about placement of a whole house dehumidifier and made changes that I'm very happy with. Dan and Kevin navigated a very challenging ERV install where they were able to innovative in duct placement to make it fit my home while still giving me the access I need. Thank you! I feel in good hands with this team. read more

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The best HVAC service I have ever had! Elijah found the problem and fixed it in about 20 minutes. Now my air conditioning is working great. I cannot recommend C.D. Shanahan's HVAC, Plumbing, Electrical highly enough. I will never use another company in the DMV again. And they are honest. The other company that estimated repairing my system wanted $2,648.00 and then they tried to pressure me into buying a new system for $10,000.00. When that did not work they sabotaged my HVAC unit and I had to go without heating or air conditioning for four days until Elijah fixed it yesterday for $89.00. Avoid the crooks and call C.D. Shanahan's HVAC, Plumbing and Electrical for and honest and fair deal. - Dr. Ed read more

Brought them out to diagnose an HVAC problem. Very nice technicians. Problem was that the interior windowless bedroom would not cool. Various outside temperatures ranged from mid 70's to high 80's. Room would not cool down to less than 71 when temp was set to 69. After 2 visits, was told system was operating properly. Since the room had previously cooled to 69 but had stopped doing so all of a sudden, I considered the problem had not been diagnosed accurately. Simple math refuted their statements that all was fine. Was supposedly given a full report but really did not get that. I was in construction for 12 years and could tell that the nice technicians. I finally got up in the attic and discovered that the problem was air flow to the room. I fixed it myself. At 74, I'm a bit too old for getting into attics but I did it. What these technicians did not understand was that the purpose of an HVAC system is to condition the air in rooms. If the HVAC system checks out, the next step is to check air flow and temperatures in the room itself. That step seemed beyond the capabilities of Shanahan. So, nice technicians, probably good for changing your air filters but for diagnosing a problem, not their strong suit. I would note that after not being able to fix my problem, Shananhan's technicians did send proposals for more work to be done. One of the proposals was about $5,800 for more work. However, because Shanahan was unable to fix the problem I needed fixed, I did not have confidence in their ability to do anything complicated. Finally, and again, the technicians were extremely polite and friendly. That counts for something, I believe. read more

After leaving my review, the owner offered to waive the $89 service charge in exchange for an updated review. That's not how this should work. Your service should make me want to update my review. I didn't respond because it was the weekend and I was spending it with my family. The owner then threatened me Monday morning with a mechanics lien for the unpaid service charge (which I hadn't paid because the invoice went to spam). I told him he should waive the service fee because I was unhappy with the outcome, not because I left a poor review. I told him that if he waived the fee, I'd leave my review untouched (which certainly wasn't a glowing endorsement, but I felt accurate to the situation) however if he kept threatening me, I would update my review. I'm here updating my review, so I guess you can figure out what happened. More threats of accruing interest and a mechanics lien (which he couldn't have filed anyhow). I could have taken the easy route and updated the review and saved $89 but the fee was paid, and my review stands. This interaction left me questioning the validity of their rating. read more

They were great! Very responsive and quick to come out. Elijah was our technician and he walked me through what he was doing with the unit. He talked through some of the steps he was doing and what would typically cause the problems we were having. He ran step by step testing and found the issues and was able to fix and resolve them right there. He also gave good tips on normal maintenance we could/should do on a regular basis ourselves! He fixed our condensate waste pipe, got our heater functioning again, and fixed a floor vent piping that had broken. Great customer service, knowledge, and execution. Highly recommend! read more

I had a great experience with C.D. Shanahan HVAC. The technician was professional, knowledgeable, and took the time to explain everything clearly. The work was done efficiently and the system has been running perfectly since. Pricing was fair and communication was excellent. I would definitely recommend them for any HVAC needs. read more

C.D. Shanahan's service and responsiveness have always been great. I definitely recommend them.

We are so grateful to and for CD Shanahan. We've found them to be incredibly responsive, skilled and their prices are fair and reasonable. I can't say enough great things about our them. Brandon is our go to. He is incredibly skilled and knowledgeable and explains things in terms that I can understand. We highly recommend CD Shanahan. Over the years we have used their emergency service and regular appointments. Their schedulers are also responsive. Our most recent interaction with them was when our a/c stopped working. They had it going again quickly and for a reasonable price. read more

Were able to correctly, diagnose the problem that I was having and fixed my boiler. The workers were professional and courteous.

I hired Shanahan's to install an "Air Scrubber," an UV light ionizer that is mounted into the existing HVAC duct above the heating coils and adjacent to the humidifier that is also mounted on the ductwork. I was concerned about possible mold spores from the humidifier as well as other pathogens that may be contributing my coughing and sneezing; the Air Scrubber is supposed to reduce allergens and other contaminants. It is too early to tell if it is making a difference, but I am hoping for the best as it is a pricey addition. I was going to have a new media filter system installed too, but canceled the job because I want to see if the ionizer makes any difference in my home. The technician, Elijah, was on time, personable, respectful, and installed the ionizer efficiently. read more

Absolutely outstanding service from C.D. Shanahan's. Armando, Juan, and Elijah were incredible! Armando and Juan from C.D. Shanahan's HVAC, Plumbing, Electrical & Remodeling LLC came out right before an impending severe snowstorm and worked in sub-15° weather from 8 AM to 8 PM to uninstall our broken Heat Pump and Air Handler and replace them with a brand new Heat Pump and Air Handler. Simply put: these guys were the best. Incredibly professional, hardworking, and dedicated from start to finish. They didn't rush a single step. They also helped install a new thermostat, made sure everything was running smoothly, and ran all the necessary tests to ensure the system was operating perfectly before they left. Huge shoutout to Elijah as well!. He took the time to explain everything in detail about the humidifier, thermostat, and Air Handler, and gave us genuinely valuable maintenance tips that made us feel confident moving forward. C.D. Shanahan is probably the best HVAC company you've never heard of. If you want a team that shows up, works hard, communicates clearly, and takes real pride in doing the job right. Highly recommend. read more

AC Unit stopped working Thursday evening. I put in a request and CD Shanahan reached out that evening. A gentlemen named Elijah showed up by 9am Friday morning and replaced the capacitor within 30 minutes. Checked that the AC ran and blew 50 degree air and fixed all issues. He even noted that' my other unit looked good and that the units filters were clean. Great service. I can't complain because of how efficient they were but the price to replace at $490 did seem high but to have someone how so quickly and provide really reliable, white glove service it was worth it. On top of it all, he didn't try to up sale you. read more

We have been customers for 3 years and generally found them reliable and fair. However, most recently when our AC stopped working, they sent someone quickly, but charged us over $800 for an emergency repair (where the part was about $20 at retail value). We paid it thinking the problem would go away, but the system shut down again five days later due to a "slow leak" that was not detected in the original diagnosis. The technician was nice and professional, but ultimately we were facing an additional $4K repair or a new system. Given our current system was already 15 years old, we opted for a new system and asked for estimates. While they provided 4 estimates, one product stood out as competitively priced for the efficiency standards and quality. As we were about to approve the purchase of the unit (which included a discount to offset the $800 error described above), in the fine print of the estimate, we noticed that the refrigerant was listed as R410A. Because we had just consulted with multiple HVAC companies that had cautioned against this refrigerant and its future availability/serviceability, we researched online and confirmed that it was banned from production by the EPA beginning this year (2025). Furthermore, new systems that relied on R410A were banned from production, which explains the relatively low price, given retailers needed to offload these obsolete systems. We were disappointed in the lack of transparency as most consumers would not be able to identify refrigerants and the associated regulatory prohibitions by name. We had obtained estimates from 4 other companies, none of which tried to sell us systems reliant on the obsolete refrigerants. Bottom line is, if you use CD Shanahan's, make sure you do your independent research on the product. If it looks too good to be true, it probably is. read more

10/10 would recommend this company. Our AC broke on July 3rd, and despite the holiday, they were promptly in our house a day after we contacted them to come replace it. Everything from scheduling, to the estimate visit to the actual replacement and work done were top notch. Very impressed by their customer service and ease of communication. Connor, Jimmy, Elijah and Ian were great to work with. Very happy with their work! read more

My compressor went out so I called CDS. They scheduled a tech to come out the next day to diagnose the problem, and that evening they provided a fair estimate to replace the aged unit with a few options. Once we accepted the installation was set for the next day. Their pricing was competitive, work was good quick and thorough. The team was courteous, professional, respected our property and cleaned up after themselves. We love our new unit. It cools well, is quiet and efficient. read more

C.D. Shanahan’s - New AC unit - Heating & Air Conditioning/HVAC Near Me

This company is absolutely wonderful to work with. They quote reasonable yearly price to get your hvac system checked and also helped me out with some problems since I recently bought my place. The previous owners did not have the right filters with the unit. This company explained why there was an issue with this and easily quoted a reasonable price to fix this issue and ensure this won't be an issue in the future. I highly suggest them as long as they service your area. read more

Fast, Friendly, Reliable! If you need HVAC service, stop scrolling and call C.D. Shanahans. I've worked with them a couple of times now and plan to keep coming back. The first time was in August 2024, when I needed a last-minute furnace inspection to stay compliant with my condo association. I had called several other companies, but most either didn't offer furnace inspections during the summer or couldn't get to me for weeks. C.D. Shanahans was a godsend. They came out the very next day, got it inspected, and saved me from a potential mess with the association. More recently, my air conditioning stopped working. Once again, C.D. Shanahans came through. They were out the next day to run a diagnostic, and the day after that, a full team showed up and replaced both my furnace and AC at a reasonable cost. As someone who rents out the property, I can't overstate how valuable it is to have issues resolved quickly and professionally. My tenants are happy, and so am I. Huge shoutout to Connor, Hannah, Dan, Kevin, and the rest of the team for being so responsive, efficient, and just genuinely great to work with. read more

I was referred by a neighbor in my condo community. My heat pump stopped blowing hot air. Messaged to get it checked out. Appointment was set up within hours to come out the next day. Elijah came out to do the diagnosis and identified multiple solutions and chose the one that would have the least risk for the unit. He also took the time to explain what may have happened and how to prevent this situation in the future and what to look out for. It was excellent from start to finish! read more

Connor and the C.D. Shanahan team did a wonderful job replacing and upgrading our team water heater system! What I really appreciated the most was how easy it was to communicate with Connor, and get a quote through pictures and texts! Also when we had a slight issue, we were able to easily get a hold of Connor and Brandon at night to get the issue quickly fixed! I checked multiple quotes, and this friendly family business had the best value and ratings! Highly recommend them to everyone and anyone! Looking forward to using their HVAC, electric, and plumbing services as well in the future! read more

Outstanding communication!! Our gas furnace stopped blowing warm air. I reached out to CD Shanahan's based on their reviews on Yelp. I sent a message through Yelp and received a response almost immediately. I did not classify as an emergency, so a service visit was scheduled for the next morning. Promptly at the prescribed time, Jimmy, the HVAC tech arrived. Text messaging and email was used to send confirmations and updates. Jimmy was very professional. What I like most is that he clearly communicated points about our unit. (It's pretty old.) He quickly identified the issue-a faulty igniter. Thankfully, the universal igniter he had on his truck was appropriate and he was able to install very quickly. He finished the job within 30 minutes. He explained everything in language that was easy to understand and answered all my questions. In addition, we discussed other services CD Shanahan's can offer. The heat started coming out the vents and I was very pleased. Additional communication from office staff regarding payment was also very easy and professional. I would recommend and will use this company again. read more

We have a service agreement with C.D. Shanahan's for our HVAC. Our previous service was provided by Climate, and they were excellent, but John C. Flood bought them and JCF is just terrible. Having said that, C.D. Shanahan's is actually better than Climate! The service agreement costs slightly less, and the technical knowledge of their crew is at least as good as Climate, probably better (and that's saying something). The thing that really stands out though, is the customer service. C.D Shanahan's is so customer-centric. At times I think that I may be their only customer because they are so responsive. I really cannot recommend them highly enough. The best of the best. read more

We reached out to Connor for a new hot water heater and he was one of the few people to come out and take a look instead of asking for pictures over the phone. He answered all of our questions and was very transparent! The plumbers that came to our house, Evan and Brian, were so friendly and worked so efficiently. They again answered any and all questions we had and walked up through a few things. Would highly recommend C.D. Shanahan's for their value and honesty! read more

They provided obligation free late night on call support to help bypass the thermostat, and next day the tech arrived and executed thorough diagnostics and performed part replacement & repair seamlessly & professionally read more

Requested inspection of the HVAC system after we purchased a new home with a zoned system. The contractor did a great job testing the system and was honest in letting us know the system was in good condition aside from a upcoming cap replacement. read more

I was recently on the market to get my HVAC unit replaced. After receiving multiple quotes from various companies, CD Shanahan offered the best price for a SEER 17 unit. Connor was quick to respond when I had initially reached out for a quote via Yelp. He was very responsive and was able to provide me a quote virtually via pictures I sent of my old unit. On the day of my installation, Connor arrived within the 3 hour window and was able to knock out the installation himself. Connor has been working as a HVAC tech since he was young and that clearly shows in his workmanship. The condenser and air handler were installed with great care and attention to detail. After my experience, I can confirm that all the other positive Yelp reviews are accurate and I'll be recommending CD Shanahan to my family and friends for their HVAC needs. read more

Reached out to Shanahan's as a second opinion after a previous company told me I needed to replace my AC & furnace because of their 5-star ratings on Yelp & Google. Connor gave me recommendations regarding my existing system - truth be told he said I could keep running it until it failed, that it wasn't an emergency that had to be dealt with now (but it would be then) - and then went over options available to replace it which I'll call good-better-best. All via text and phone calls because I was on the road traveling for work when this went down. Bottom line: 5-stars from me because they're super responsive, honest, and will work with your particular situation (just AC, just furnace, both at same time to save a little $$ in the long run, etc). Without hesitation I'd use this company again, you should give them a shot too. read more

Shanahan's staff have consistently been able to diagnose our HVAC and plumbing problems, and to swiftly develop effective fixes. They have corrected the blunders and mistakes of other installers, and made solid recommendations for future work. Shanahan's technicians are honest and trustworthy - they have explained in detail why additional work as recommended by other firms is unnecessary, thereby sparing us aggravation and expense. We are fortunate to have found them, and will continue to use and to recommend them. read more

Connor and team are wonderful to work with from the get go. He took the time to discuss how best to size the system for my 1972 house. When his team came in to install, Dan and Dillion were absolute professionals! Didn't even take a lunch break and cracked out a pretty complex Trane system install, including duct fabrication, with precision and focus! Couldn't help but notice how everything was so cleanly buttoned down while Dan explained all the important features! Certainly the only crew to call for your HVAC and even ductless system needs! read more

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Our a/c went out just as the weather started to warm up and I called a couple of companies for quotes and availabilities. Shanahan's got back to me the quickest, they were available the soonest, and their diagnostic fee was reasonable. Hired them and Jimmy was at our house less than an hour later. Jimmy is a wizard at his job. He is so efficient and knowledgeable. Very trustworthy. Our a/c needed a special manufacturer part and Jimmy kept me updated while waiting for the part. I really appreciate this customer service. I'll always call Shanahan's for HVAC maintenance and repairs in the future. I'm impressed with their work, efficiency, and customer service! read more

I've used CD Shanahan's many times over the years. I trust them. They're competent, reliable, good guys. Jimmy has been particularly excellent. And Connor, the owner of the company, has been very responsive and reasonable. I recommend them highly. At this point I wouldn't go to another HVAC company ever again; they're my go to guys for all things heating and cooling. They also do some plumbing work I believe as well. Trustworthy, reliable, and professional! read more