We are Maryland's oldest and most reliable air conditioning, heating, and plumbing service provider. We've been in business since 1902 and are a 5th generation family business!
Customers consistently praised the friendly, professional, and responsive nature of the technicians.
Efficiency
Many reviews highlighted the promptness and efficiency of service, with technicians arriving on time and completing jobs quickly.
Professionalism
Technicians were frequently described as knowledgeable, courteous, and thorough in their work.
Communication
Customers appreciated the clear explanations provided by technicians regarding services performed and options available.
Quality of Work
The quality of work was often noted as excellent, with many customers expressing satisfaction with the results of installations and repairs.
LD
Latresha davis
6 days ago
5.0
I’ve had the pleasure of having Farnen & Dermer guys work on my systems throughout the last couple of years, my most recent problem being my hot water heater. Shout out to Glenn, John and RJ those guys were so kind, thorough and professional, same as with all the guys. I highly recommend them to anyone with HVAC issues😊
PG
Patrick Gray
Nov 17, 2025
5.0
My experience with Farnen and Dermer was excellent. Both techs who came did a great job of explaining their work and answered any questions I had.
The initial sales experience was also great was also very east. Believe me, this was not a purchase I was looking forward to but they took a lot of the stress out of it. I would recommend them to anyone in the same situation.
AS
Alexandra Smith
Nov 16, 2025
5.0
Really good experience with Farnen & Dermer. However, I feel the sales person who initially looked at our broken system tried to upsell us with a UV light for an A/C only system - even though he said he wasn’t trying to upsell us - that was only six years old and had no real issues with mold. I also felt that he was abrasive in the beginning of the appointment and couldn’t really communicate or articulate how he liked to work best (specifically, he asked me to stop asking him questions and told me he needed to figure out the situation before giving me the solution, which is fine, but he should’ve expressed that before he started working so that he didn’t come off rude when I was simply trying to remain informed about our system). He obviously was much friendlier once we put in a purchase order later that day with him. He also got us a discount to meet an original quote we got from this company months ago before we knew the system was broken. On top of that, my initial experience with him was all made up for with the incredible installation and service after we purchased the new system. Not only were they able to replace our system the next day, but the installation professionals were extremely communicative, helpful, professional, and honest. Would highly recommend them If you need an installation!
JR
Joan Roth
Nov 10, 2025
5.0
Replaced gas hot water heater. Between locating the water shut off valve, moving the old heater out and the new one in and reconnecting the gas line, it was a long job which the men did cheerfully and competently. So far so good.
ER
Ed R
Oct 30, 2025
5.0
Our HVAC system is nearly 30 years old and showing its age. Have 3 companies gave their qoutes and Farnen and Dermer has the most appealing package in price and type of equipment. Charlie checked our system and made recommendations, financing options, explained the BGE electrification rebates, federal tax credit benefits of a new system. Caleb and Mike performed the installation , answered questions and concerns, preventive maintenance, warranties and gave a thorough “tutorial” on the thermostat. Oh and they even shipped a box of goodies. Seriously who does that nowadays. Overall excellent customer service, knowledgeable and competent technicians, highly recommended company.