Customer Testimonials

Click Here to Read Our Reviews on Google.


Heat Pump Maintenance in Columbia, MD 21046

“Environmental Systems has proven their commitment to customer satisfaction. As soon as the management learned of my period of unsatisfactory dealings with them, they reached out immediately to rectify the situation. Their concern and commitment renewed my long-standing trust in their company. My 50 year sole reliance on them for all heating and air conditioning service has been validated by their superior handling of this problem. And I will continue to give them a 5 star rating.” – Lucy H.

Heat Pump Repair in Columbia, MD 21046

“Fast, efficient, and personable. Follow up and notifications were great!”

– Phil S.

Heat Pump Installation in Columbia, MD 21044

“I began using ESA in 2002 when I bought a home with an existing ESA maintenance service agreement. Every maintenance technician has been professional, courteous, and educational. In Dec 2020, I replaced my HVAC system. The experience has been outstanding. ESA helped me select the high-efficiency system that meets my needs, acquire excellent financing, and EA continues to patiently teach me how to get the best operation from my investment. The phone staff is knowledgeable and always courteous. I recommend ESA.”

– Ayodele M.

Heat Pump Installation in Columbia, MD 21044

“Wonderful experience working with Environmental Systems Associates from start to finish. All of the installers were very professional, and did a great job removing my old system and installing the new one. I was very impressed with the quality of work and the efficiency at which they completed the job. I have now had nearly two weeks to evaluate the installation, during a period of extremely cold weather, and everything is working perfectly.”

– Michael G.

Gas Furnace Repair in Ellicott City, MD 21042

“We would like to recognize Nicholas for his outstanding efforts in troubleshooting our recent issue with our furnace thermostat. We called ESA because our thermostat screen would turn “blank” several times a day for several minutes. Initially he thought we would need a new thermostat unit, so a followup appointment was scheduled for the next day for installation. When he returned, he told us he had thought about this problem and wanted to check some other things in our system, thinking perhaps there was another problem causing the thermostat to shut off. After some more investigation, Nicholas found that the fan speed was set too low during the new installation last year, which was causing excessive heat and tripping the system to shut off. This solved our problem, and he saved us over $400. We would like to commend his diligence and motivation, since he was thinking about this during his off hours. It demonstrates that he is a very capable technician who should be encouraged towards more responsibility and higher level work. Thank you!”

– Audrey K.

Gas Furnace Installation in Ellicott City, MD 21042

“The team that installed our new furnace/AC did a great job. They were professional, wearing masks, and were efficient. At the end, the team leader explained every. I am very impressed with every aspect of the job.”

– Robert F.

Air Conditioner Replacement in Ellicott City, MD 21042

“ESA installed our air conditioner and gas heat units 22 years ago. When our AC unit stopped working, ESA came right out, assessed the situation, and explained our options. In the few days that we were without working AC, ESA lent us a portable room air conditioner unit, which cooled our main living area nicely. Our new AC is wonderful!! The ESA technicians are fantastic and take care of every detail. Upon completion, the system was explained to me in detail. I highly recommend ESA for all heating and cooling needs.”

– Jane J.

Air Conditioner Repair in Elkridge, MD 21075

“JJ came out today when the system said it was malfunctioning and to call ESA. JJ was here within the hour from when I placed the call. He was professional, friendly, efficient, and very knowledgeable. He answered all of my questions and ensured that I had an adequate understanding of everything going on. JJ truly embodies the characteristics of a phenomenal provider of service in this industry.”

– Cheri T.

Air Conditioner Maintenance in Ellicott City, MD 21042

“I have been using Environmental Systems Associates for over 10 years and it has always been with excellent results. Recently, I added a Gas Furnace to my house and went through ESA to handle all the aspects. Top notch professions that really know the systems. I also have relied on them for yearly maintenance and repairs. Always on time, always knowledgeable and professional. I believe they always go above and beyond by providing advice, tips on getting the best out of your HVAC systems. They are the absolute best!”

– Mary Ann E.

Gas Furnace Installation in Columbia, MD 21044

“Love our new gas heater and air conditioning system. The installation crew was professional, efficient, and went beyond requirements to complete an excellent job. We are extremely pleased.”

– Barbara D.

Beverly Belin
Beverly Belin
11:37 22 Mar 22
Excellent work
elaine stenzler
elaine stenzler
13:45 21 Mar 22
All three men and their helpers did an excellent job. Worked from the time they arrived until the job was finished. Coordinated the installation of the new heat pump on the roof with the installation of the new heating and A/C unit in our condo unit. Also they responded quickly to make an adjustment for a minor problem, which was then resolved.
Ben Bass
Ben Bass
13:25 21 Mar 22
Matthew Kerwin
Matthew Kerwin
11:37 17 Mar 22
lucy hunter
lucy hunter
16:52 10 Mar 22
After using Environmental Services for over 40 years, I have to comment that in the last 6month I have found their service to be totally unacceptable.They have refused to honor my prepayment for last years service agreement. Each time I have called, a receptionist says I need to speak with the service manager, Steve. She always says he is "out of the office" and connects me to his phone message line. He has never returned my 3or 4 messages. I have been a paying customer to them since early 1970's. What happened to loyalty - something has changed in their business model. I am finding a new company.
Barry Windheim
Barry Windheim
03:23 08 Mar 22
We have been using Environmental Services for 30 years. Tonight, 3/7/22 I called because our Vice thermostat was not working properly. ESA put it in 9 months ago. Later with a winter checkup we complained about this thermostat and they were supposed to put in a different one. The technician did not bring one. Today, I called after hours and tI explained that all I wanted to do is find out how to turn off the system because it keeps running and running. The operator said she will take the message and someone will call in the morning. Yet, the recording says if it is an emergency press o. I don’t think that is the way to handle an emergency if your system won’t shut off. All I am asking is for someone to call back and guide me on how to use this confusing VIVE thermostat. In the past a person has called back and helped me over the phone. ESA’s service has deteriorated in the last couple of years. Like I sad we have been loyal customers for 30 years. Plus the fact their more recent payment structure for service contracts is lousy.
John Brandenburg
John Brandenburg
02:35 25 Feb 22
ESA did a great job for us; amazing job replacing two furnaces and air conditioner systems and hot water heater in one day!
Brittany D.
Brittany D.
03:57 18 Feb 22
James Ray
James Ray
14:20 16 Feb 22
Stephen Greif
Stephen Greif
03:50 12 Feb 22
Aaron Wilson
Aaron Wilson
01:46 08 Feb 22
Kim Garner
Kim Garner
14:24 28 Jan 22
A very knowledgeable, professional and detailed team. I will recommend them to everyone I know.
LeeAnn Geist
LeeAnn Geist
21:17 16 Jan 22
The teams that installed our water heater, furnace & air conditioners were fantastic. They kept us apprised of their progress and completed the entire project (basement & attic) in one day. Shout out to Ryan, Dennis, Cody, John & Dylon.
Melissa Mehl
Melissa Mehl
21:04 11 Jan 22
We had a new system installed and it’s working great! Every time we had a question, it was answered with care and speed. So very thankful for this company and its people.
Eddie Cosentino
Eddie Cosentino
18:35 24 Dec 21

Need HVAC Service?

Call the experts at Environmental Systems Associates.

Call us at 410-381-7991


Environmental Systems Associates proudly provides HVAC service to Howard County. Visit our service area page for more coverage details, call us at 410-381-7991, or request service online today.