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Google Rating

4.8

Based on 205 reviews

Ground Loop Heating and Air Conditioning

4.8

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After having someone look at my unit as side work, it was determined that I needed to replace the entire system. As it was during the hottest days a few weeks back, I needed someone to come out ASAP! I contacted Ground Loop and they had someone out the next day, and a quote a day after that. I signed, they ordered, and the system was installed within a few days! Thank God, as the weather was hot!! Everything from the sale to the installation went smoothly and efficiently. The entire staff that I dealt with were friendly, courteous and professional! Highly recommend!

Groundloop is a business with integrity. Their service is excellent and our geothermal system is outstanding.

Great professional experience every time!

We love this company. They always remind when it is time to schedule our regular check up, and the technicians arrive on time and are very courteous and knowledgeable!

The two gentleman that came to help us out in the middle of the heat wave were respectful and efficient despite the unbearable temperatures in our attic. We couldn’t have been more pleased with how they handled the situation.

As always with Ground Loop I called about an issue and they were out the Same or Next Day. My technician was Antonio who was knowledgable, fixed the problem and made sure I got back to him personally if I had any more issues.This company is great to work with!

Amazing service. Air went out overnight and by 12:30 pm we were up and running and back to being cool. Thanks for the prompt and efficient service.

I have geothermal installed in my home by Ground Loop. I am pleased with the results and also the service from Ground Loop is very good. I recommend geothermal to anyone who is looking to go in that direction.

Great service. The young man was very nice and helpful

I had a very difficult experience with ground loop and unfortunately can not recommend them. Although initially the project was going well, they did not fulfill the project as we discussed and did not install the proper equipment for functioning of the internet monitoring symphony system for the water furnace geothermal in our main house and did not setup the symphony system in our secondary structure system. In addition, it was very difficult to schedule work with them and the project took much longer than expected to complete.They only came out to finish the work properly when we withheld their final payment for incomplete work. Then after completing the work I promptly provided the payment only for them to refuse to provide the final rebate documents needed for the tax credits for state and federal and my state renewable energy credits filing in an attempt to extort me for additional money beyond what we agreed for the project. They have also refused to provide appropriate warranty/maintenance services related to their installation which was not cooling properly in the main house just months after installation due to a freon leak as shown in photos attached. Needless to say, this was a horrible experience and although they seem to be skilled professionals I do not view them as honest business people and therefore would recommend to stay away. I myself will not be doing additional business with them.

Fantastic company. I will use them for all of my future geothermal projects. Mason, the technician was extremely friendly, knowledgeable, and got the job done quick.

Ground Loop did a great job with our HVAC systems

Installed Geothermal with Groundloop a year ago to replace a bad heat pump that was only 10 years old. 1 year in, we are spending less on power for both heat and air in comparison. And my neighbor with a recently insulated home, oil and ac, is spending more on oil than our entire geothermal power for all seasons. Professional team, right through the 2 maintenance visits in year 1.

Gl installed our system in 2007 and have been actively supporting it. They are responsive and reliable. As the geothermal world grew every HAVC group has claimed that they are the best, but none have the knowledge and experience that GL has!

Antonio keeps an eye on our system and is always spot on.

Always there when we need them. They do a thorough and honest job every time.

Easy scheduling, quick response, and service people that are incredibly knowledgeable and informative.

We have used Ground Loop for maintenance on our Water Furnace System for many years. Their technicians are friendly, knowledgable, and efficient. We expect to be using them for many more years.

Very professional, knew exactly what they were doing. Cleaned up after themselves & made sure the unit was running perfectly before they left. We are very pleased & recommend them whole heartedly. The office personnel were also the best. They took care of everything for us including the rebate package

I have partnered with Ground Loop for 10 years. They have met all my installation and maintenance needs wrt my geothermal (w/radiant heat) system. And they are friendly and easy to work with.

Every time I have an issue with my system (which is not often), Ground Loop responds immediately and is out with a technician who is friendly, helpful, professional WITHIN24 hours. They have even come in the evening and responded to texts at night to help me trouble shoot over the phone. THE BEST customer service.

We have been a customer approximately 5 years. They provide excellent customer service with our maintenance contract and any emergency calls.

Excellent customer service! As a repeat customer, every service visit has been a great experience. Rapid service, professional technicians, very clean, skilled and trustworthy, very fair pricing. We Highly recommend using Ground Loop Heating and Air Conditioning for all of your needs.

Air conditioner installation was completed quickly & efficiently. Installers were friendly and they left the house clean & neat.

Excellent service!

The man who came to service my system was absolutely wonderful! He was very knowledgeable and did a complete check of my system. He even showed me where to turn off valve for my water it and he pointed out parts of my system I was aware of. He was very helpful!

These guys are great - and geothermal heat pumps are an awesome product.

From start to finish the team from Ground Loop did a great job. They all were knowledgeable and went about their jobs in a very professional manner. They listened to our concerns and together a plan was created that was acceptable to everyone.
The system was installed in September of ‘24 and has been flawless. The temperature in the house has never been this balanced in the 30+ years that we have lived here.
Overall we are very pleased - no buyer remorse here. Highly recommend

We had a geothermal HVAC system installed by Ground Loop. They explained the many elements to doing this - how the system works, the rebate programs, both Federal and Maryland, and how the install process would go. Everything happened exactly as they said. All pricing was exactly as stated. They were patient, thorough and answered our (many) questions. Very pleased and highly recommend.

We installed geothermal with Ground Loop 9 years ago but at that time, retained an attic heat pump unit for the second floor. Looking ahead, Ground Loop installed additional underground loops in case we should want to convert the attic unit to geothermal in the future. We have been so happy with our main unit (and it so significantly reduced our utility bills) that we finally decided this season to replace the attic heat pump unit with a second geothermal unit--and of course, hired Ground Loop to do the work. Already we are noticing that the new unit is significantly quieter--in fact we hardly hear it--and the temperature in the house is balanced for the first time. Given the tax credits and rebates, we finally decided we could afford the second unit and are already glad we did. Also, the installation crew was very respectful of our home, got very creative to minimize the additional installation requirements, and very neatly installed the new equipment in both attic and basement, to tie in with the loops already in place. We highly recommend Ground Loop and geothermal.

We had the best experience with the Ground Loop Heating and Air Conditioning. After three days without power, our heating system failed to start, it was freezing in our house. We called GLHAC, they sent immediately their technician Wyatt, he came within less than a hour, was very polite and knowledgeable, diagnosed our problem and soon after our heating kicked in. We appreciate this company professionality and the service they provided very much and would like to recommend it to anyone with a need for heating and air conditioning service. Our big thanks goes to Mr. Wyatt!

I had such a good experience with Ground Loop. Our heat stopped working over the weekend and when I called on Sunday, the owner of the company answered and got a technician over to me later that day. They quickly diagnosed the problem, ordered the necessary part, and had it fixed the following day. The customer service is 10/10. I cannot recommend this company enough!

Austin was right on time and went through the system diagnosing the issue quickly. Great Service.

Professional company providing quality service. Prompt, reliable and technicians are polite, very well trained and knowledgeable. A pleasure to deal with.

Representative was very professional and thorough. He spent time discussing the project and told us if any more question please call.

We used ground loop to service our geothermal unit. Very professional and knowledgeable company. Would recommend!

Amazing services all around. Prompt and always friendly

Installed 3 ton horizontal loop WaterFurnace system and could not be happier with the outcome. Ground Loop has helped us realize our long-term plan of making our farm net-zero and I believe we are there: this winter will tell.

The unit has the advantage of being a "set it and forget it" HVAC so I don't have to monkey with programmable or AI thermostats. Even during the cold snap in January, this thing didn't break a sweat, effortlessly keeping the house warm with NO electrical resistive (emergency) heating needed.

My only suggestion is that I hope someday they are able to bring a master electrician on board, in-house. The minor troubles we did encounter can be attributed to difficulties coordinating and communicating with the electrical sub.

Super professional, timely and friendly. My only complaint would be the aggressive tearing up of the lawn, rolling over and burying plants. That being said, I highly recommend

Great response and service. Jacob is an excellent troubleshooter and repairer.

Technician very knowledgeable did a great job

My 3rd geo thermal thermal unit installed as they have been wonderful. Can't say enough good stuff about the ground loop people.

Two superb jobs. First, had furnace that wasn’t putting out enough heat. Diagnosed a leak in the coil and replaced the coil quickly. Second, added a steam humidifier to main furnace handling the electrical, plumbing and thermostat beautifully.

The office team is wonderful!

We have been with Ground Loop for 6 years and they maintain our geothermal every year. We are happy with their service, the crew are very professional.

Ground Loop (GL) installed my two geothermal sytems in 4/2015. Of the 3 companies I got a quote from, GL's was the best, and when said and done, appeared to be the right decsion. The systems have been great and GL's service and custumer service have been great.
Only thing the cost of their yearly maintenance contacts have almost doubled. They do perform two yearly comprehensive check ups. Just wished they could do something to lower the yearly cost.

I've had my system since 2008 with no problems. I've always gotten excellent service when they do the periodic maintenance checks.

Groundloop oversaw and installed installation of a geothermal system. Everything went as planned from the drilling of the well to the installation of the heat pump. The Ground Loop staff and workers were professional, prompt, polite and were consistently communicative so we understood every step of the process. Routine maintenance calls were also excellent. Recommend the company highly.

CONVENTIONAL TO GEOTHERMAL REPLACEMENT

GEOTHERMAL NEW CONSTRUCTION

GEOTHERMAL TO GEOTHERMAL REPLACEMENT

EXPERIENCED, DEDICATED, AND DETERMINED

Model of house utilizing an underground geothermal system.

Ground Loop Heating and Air Conditioning is one of the largest and most experienced geothermal heating and cooling installers in the country. We install WaterFurnace geothermal systems and are proud to bring you over 30 years of WaterFurnace geothermal experience. Ground Loop specializes in all things geothermal. Whether it’s a traditional geothermal energy system using vertical, horizontal, or pond loops; geo radiant flooring; geo source Variable Refrigerant Flow (VRF); or full-time geo domestic hot water; Ground Loop has your answers.

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We service all brands including Climate Master, Bosch, Hydron Module, GeoStar, Hydro Delta, and Enertec.

Renewable Energy Credits Now Available for Geothermal!

New legislation took effect in 2023, Geothermal heating and Cooling qualifies for Renewable Energy Credits or REC’s in the state of Maryland! When you in install a new geothermal system you can earn an average of $4,158 EACH YEAR YOU OPERATE YOUR SYSTEM. That’s right… you earn REC’s worth thousands of dollars every year your system is in operation, which could be 20-25 years! Combined with the 30% federal tax credit, state, and local incentives and you geothermal system can be 100% paid for in incentives. Click here to talk with a Ground Loop representative to find out more about geothermal in your home. Find out exactly what incentives your home would qualify for.

CURRENT INCENTIVES

Image of capitol building for geothermal tax credit section of home page.

WE TAKE PRIDE IN OUR WORK

“Ground Loop just completed a geothermal installation in our home. From start to finish we could not be more pleased. Ted Evans came out to our home and explained the system and installation process. He then examined the site, measured the house and presented us the quote. All of our many questions were answered at that time. After the wells were drilled Ground Loop began their installation which took approximately 2 days as promised. All of their employees were very knowledgeable, professional, and respectfully. They were very detail oriented, and the final outcome reflects that. The county inspectors were on site the other day. During the inspection on of them commented to me that he was not just glossing over the inspection. He takes the inspection very seriously, but he knows from experience that when he is coming out to look at an installation by Ground Loop, he’s not going to have a problem. Things will be done right. Highly Recommended”

Chuck

D .

Ground Loop has been very responsive to my needs in terms of scheduling. Also, they have arrived on time and are good at communication. I consider the ability to stay in touch with any service provider important and am pleased with their attentiveness.
-Suzanne W

“Ground Loop, and in particular, Toby and Scott, get 5 stars for finally resolving what had been many years of frustrations regarding my geothermal cooling upstairs. The system installation, and its bi-annual maintenance, had been performed by another company. I had complained for several years about the upstairs cooling not being able to maintain at the thermostat setting during the hot summer days. They offered a variety of ideas, including the installation of a new air handler (an expensive non-fix), none of which improved the cooling. My builder suggested Ground Loop for a second opinion. Toby immediately observed multiple compressor leaks as well as poor pressure readings. Mind you, the system had just been inspected 2 months earlier by the installation/maintenance company. Scott made recommendations and oversaw the work. Finally, my upstairs is maintained at the thermostat setting for the first time in many summers. These guys are professional and knowledgable, and communication has been great! Highly recommend!!”

Tom

L .

Heat Pump & Zone Control System Installation

May 25, 2020

“Ground Loop Installed a new two speed HP with a zone control and an Aprilaire 5000 air filter. I love it! It’s much more comfortable and I would never go back.”

- Lonnie

Geothermal Heat Pump Installation in Bel Air, MD 21014

September 20, 2024

- Chuck D.

Geothermal Heat Pump Installation

April 11, 2020

“From the initial estimate appointment, through the install, and both maintenance visits they were on time or early. They completely cleaned up at the end of each workday. After 18 months of use, I have no complaints and I’m saving approximately 40% per month on my BGE bill. I highly recommend using Ground Loop for your HVAC work.”

- Angie's List Reviewer

Ground Loop has been very responsive

January 16, 2023

We Take Pride In Our Work

Geothermal Repair in Bel Air, MD 21015

July 11, 2022

- Tom L.

Air Conditioner Repair in Forest Hill, MD 21050

July 26, 2021

“Ground Loop to the rescue! We called on a Sunday because our AC unit had locked up. Jason came to our home the next morning at 8am to take a look at our unit and he had us back up and running within 30 minutes! He was professional, knowledgeable and very responsive to our need for AC, with the summer heat and with a severe asthmatic child in the home. We also knew we needed to upgrade our unit, as our home is older and we have baseboard heating units that are quite costly, to run, in the winter months. After speaking with Jason about our concerns and hearing the pros/cons of replacing just the a/c unit or getting a combo unit (A/C & central heat), we decided to purchase a combo unit and are looking forward to more cost-effective electric bills. We are awaiting the delivery/installation of our new combo unit, but the original unit that Jason came to fix has kept us cool since it was fixed! We cannot recommend Ground Loop enough and will make sure we tell all of our family and friends that this company cannot be beat!”

- Linnea A.

Geothermal Heat Pump Repair

September 10, 2020

We had our neighbor recommend your company for our geothermal repairs. We had the pleasure of Shawn arrive promptly on the morning of August 5, 2020. He was polite and informative. He fixed the problem with our geothermal system very quickly.

Your customer service was wonderful. It was refreshing to talk to an actual person so quickly when I phoned your company. I was very happy with your company from start to finish. My only regret is that I didn’t find your company sooner. However, you have our business in the future.

Regards,

– Corrine C

I want you to know how extremely impressed I am with the people

March 11, 2021

“Dear Mr. Cullum, I want you to know how extremely impressed I am with the people I’ve met from Ground Loop from Ted in Sales, to Emilie, Justin who came out to do the initial assessment, Joe the lead man and the two members of the crew who installed the unit. I have had many work crews at my house over the years and none were as professional, courteous, and competent as yours. You can take great pride in the culture of excellence and respect for customers that you have instilled in your team members. They are terrific and I will remain a GREAT fan of Ground Loop.

Most sincerely and gratefully
Mrs. Smith”

Heat Pump Maintenance

February 11, 2020

“I had Ground Loop install my system a few years back and have used their maintenance program ever since. My ground loop heating and air system runs great and I love how I save over 40% versus my standard system in my previous home. Ground Loop’s employees are always polite and super knowledgeable. I plan on using their winter & summer maintenance program to ensure my system is always working properly.”

- Matthew E.

Geothermal Heat Pump Maintenance and Ductless System Installation in Jarrettsville, MD

February 5, 2020

“We have been using Ground Loop for our yearly maintenance on our geothermal system for 6 years. They are thorough and very courteous. Last month we had a ductless a.c. unit installed above our garage in a storage room turned office. They were great to work with! We highly recommend them!”

- Judy K.

Air Conditioning Installation

July 7, 2018

They are awesome! They did a wonderful job for us and we would refer this company to anyone.

- Laurie M.

YOUR GEOTHERMAL JOURNEY!

See a full length video on the entire installation process from start to finish and hear from a Ground Loop customer, their experience in their own words. From their initial system failure and thought process to make the switch to the end result 1 year after installation!

MEET THE DESIGN TEAM AND SCHEDULE AN IN-HOME VISIT

SURVEY OF PROPERTY AND EVALUATE EXISTING SYSTEM AND HOME

PULL PERMITS AND NEW EQUIPMENT INSTALLATION

FINAL INSPECTIONS, SUBMIT REBATES, AND ENJOY YOUR HOME

Start My Geothermal Journey Today!

LATEST NEWS AND INFORMATION

3 Reasons to Consider a Geothermal Heat Pump

By Ground Loop Heating and Air Conditioning | June 10, 2025

Geothermal heat pumps have been in use since the 1940s, efficiently and thoroughly heating and cooling homes in the Lurtherville area.

Why Do I Need a Humidifier?

By Ground Loop Heating and Air Conditioning | May 12, 2025

Winter is right around the corner and with it comes freezing temperatures, frequent illness, and dry indoor air. If you struggle with discomfort during the winter in your Cockeysville home, you may benefit from investing in a humidification system.