shamrock (703) 321-9622

Serving Northern VA Since 1990

2018 NorthernVirginia Magazine Best Home Experts

Highly Rated in No. VA!

Angie’s List® Super Service Award winners: 2007-2008-2009-2010-2011-2012

See our ratings at

Licensed, Bonded & Insured

ACCA Trane Comfort Specialist Mitsubishi Diamond Dealer


“These are the best guys ever! More than fair price! Excellent service!! Allen and Hever were professional, friendly and FAST!!!!! Don't call anyone else!”

— Holly P., Fairfax VA

“Excellent. Just had them out to repair a problem created by another heating and cooling company. This company replaced my whole HVAC system a couple of years ago. I got system I wanted with a higher SER rating and it cost $1,800 less then 4 other companies.

They do little advertising. They are top rated in Checkbook Magazine for costs and quality and apparently that keeps them very busy.”

— Edward M., Burke VA

“We've used Shanahan's several times and give them the highest of recommendations. Our AC blew out during the 100 degree plus heat wave. We called on a Sunday and they returned our call that very day and sent a technician out the following morning. They pinpointed the problem and the repairs came to well under what we were fearing. They don't try to upsell you unless it's really needed!”

— John K., McLean, VA

“Have been using Shanahan's Heating & Cooling for years. Yesterday I woke up to freezing house, I called and they were at my home within the hour. I could not be happier with their service.”

— Superpages User

“I highly recommend these guys. They are all about fixing your problem not replacing units or going for the highest priced fix. I have used them for 7 years and they always give a fair price. They are happy to show you what the problem is if you are interested. They leave the parts, which to me indicates they are honest. I have always felt in good hands with this company.”

— Superpages User

“Just called this afternoon to have my furnace serviced due to my heat wasn't coming on and someone was out here before dark. He was extremely friendly and explained everything he was doing so that I would understand better! I would highly recommend these guys to anyone that needs assistance.”

— Superpages User

“I found Shanahan's in Washington Consumer's Checkbook where they received their highest recommendation for quality and price. I wish I could give them more than 5 stars!.”

— Superpages User

“Had these fellows replace our heat pump in '10. Had estimates as high as $15,000, they came in at $6,700 (included exchanger in attic and auxiliary heater as both were very old). All completed in one day. Worked with the mechanicals we had vs. replacing everything we had. Very helpful with communication and advice. Highly recommended!”

— Superpages User

“I highly recommend Shanahan's. I had my outside unit start making strange noises, so I called another company to look at it. They said I should replace the unit (it was only 3.5 years old) or I could get it repaired $1700... ugh. My neighbors suggested Shanahan's. The tech looked at everything, then just put refrigerant into the unit and that I was good to go. Wow, what a difference”

— Superpages User

“We called Shanahan's Heating & Cooling when our upstairs A/C quit working on a 90+ degree Sunday. Shanahan's technician arrived the following afternoon, at our request, and he quickly diagnosed the problem as a bad blower motor module. We just moved into the house 2 years ago and the system was already 5 years old. Shanahan's looked up the information on our Trane air handler and determined it was still under warranty. They ordered a new blower motor and our technician returned the following day to climb into our hot/stuffy attic and install the new module. Our upstairs is now cooling, Shanahan's is filing the warranty paperwork for the blower motor on our behalf and we paid a very reasonable labor charge for the job. Kudos to Shanahan's and our technician for an efficient job well done! Thank you!”

— Superpages User

“Shanahan's has been my heating and cooling company for 20 years or so. It's a family owned company, and each of their family members and employees take great pride in providing wonderful, timely service for a reasonable price. Just recently, my hot water heater began to unload in my basement. I couldn't close the shut-off valve at the top of the unit, so as water leaked out of the bottom it continued to fill with water at the top. I was beside myself. Not only did Shanahan's send someone out to help with the “frozen“ shut-off valve, but before I knew it a truck pulled up with my brand new water heater! And the nightmare was over! They left my home spotless and I had hot water within thirty minutes! I highly recommend this company, and they'll continue to be my guys for as long as I live in this area. Where do you get that kind of service anymore? Shanahan's!”

— Marianne Cruden, Reston VA

“I've used them twice for furnace issues that were quickly diagnosed and solved. Both times a minor part was defective and replaced. They could have told me I needed a major part replaced (blower motor), but they didn't. They replaced the switch for the fan once, and fixed another sensor another time when the furnace wouldn't come on. Both times they were in and out within an hour. Both technicians were professional, and informative, willing to take the time to explain what went wrong. They came out on a snowy weekend and fixed the problem asap and I didn't pay an arm and leg for it. When it comes time to replace my hvac unit, they will be the first ones I call. I highly recommend this firm.”

— Google User

“If you live in their service area don't go anywhere else. These guys are awesome! Had the compressor capacitor go out on the A/C and they were out immediately and got it fixed. PLUS it was almost half the cost in labor & parts then when I had the exact same capacitor replaced 5 years ago with another company! Thanks!”

— Google User

“We have been using Shanahan's for about ten years now and two different houses. The servicemen that come out are always very nice and do an amazing job trying to get things fixed ASAP! Why is it these things always break on the hottest or the coldest of days?? We also have been amazed at their willingness to try and fix things when they can be fixed, not just immediately tell us we need a new system, which is what happened with our last company. We have recommended them to several friends and neighbors here in Brambleton, and all have been equally pleased with their service. You don't ever want your HVAC company to remember you, because that means they come out too often....but we are grateful in this case, because it means they take care of their customers!”

— Karina T., Alexandria VA

“I just received excellent service from Shanahan's and wanted to share my experience. I discovered that my laundry room floor had become saturated with water, either from my AC or hot water heater and called Shanahan's about it this morning. Within 2 hours of my call, a service technician was at my house. He diagnosed and corrected the problem and also fixed my non-working gas fireplace in short order, all for a reasonable price. Also, the dispatcher with whom I spoke was very friendly and worked to accommodate the service visit with my work schedule. I am very relieved to have this problem taken care of so quickly!”

— K.A., Alexandria VA

Quality Service at Reasonable Prices