4.6 
1.1k+ *The Angi rating for Heating And Air Conditioning Service companies in Colesville, MD is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.
*The HomeAdvisor rating for Heating And Air Conditioning Service companies in Colesville, MD is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.
Last update on May 28, 2026
Serving Colesville, MD and surrounding areas
Approved (Corporate)
Super Service Award Winner
In business since 1982
Free estimates
Emergency services offered
"German was polite, knowledgeable, took time to explain any issues, and did not try to upsell. I will ask for him the next time I need HVAC work done."
+6
Serving Colesville, MD and surrounding areas
Approved
In business since 2020
Free estimates
Emergency services offered
"It was a pleasure hiring Sean. He was able to install our new thermostat which involved updating the wiring and removal of a module. Another company was unable to perform these tasks to get the HVAC running but Sean quickly resolved the issue. He was very friendly, knowledgeable, and punctual. Don't miss out on hiring Simply Home services, you won't regret it."
Serving Colesville, MD and surrounding areas
Approved
In business since 2005
Free estimates
Emergency services offered
"We are very happy with HVAC service. Compare to other companies they are much cheaper then others and provided quality work/services."
Serving Colesville, MD and surrounding areas
Approved (Corporate)
In business since 1970
Free estimates
Warranties offered
"We got five different work proposals for our HVAC replacement. The person who came to our house was very technically knowledgable. He gave us his cell phone number and gave us plenty of his time answering our questions. I think this contractor would have done an excellent job at a good price."
Serving Colesville, MD and surrounding areas
Approved (Corporate)
In business since 2000
Free estimates
Credit card accepted
"I had a great experience with McCarthy. They entertained the other offers I had for HVAC replacement, agreed to what felt like a very fair price and did a great job the next day doing the replacement. I'd highly recommend them to anyone for HVAC work."
Serving Colesville, MD and surrounding areas
Approved
Super Service Award Winner
In business since 2009
Emergency services offered
Warranties offered
"Saved me $$! BGE home checked my furnace and said I needed to replace lots of stuff. Doug came out and identified the real problem and saved me hundreds of dollars. Definitely would recommend this company."
+2
Serving Colesville, MD and surrounding areas
Approved
In business since 2000
Free estimates
Emergency services offered
"The job went reasonably well. They completed it in a day and a half. The guys on site had a little trouble installing the high tech thermostat for the system, but their supervisor demonstrated real accountability when he showed up on a Saturday to make it right."
+7
Serving Colesville, MD and surrounding areas
Approved
In business since 1936
Free estimates
Emergency services offered
"Brian and Ray did an outstanding job setting up my new HVAC system. They performed service above and beyond expectations. I would highly recommend McCrea and these individuals looking for high quality HVAC work."
Serving Colesville, MD and surrounding areas
Approved
In business since 2012
Free estimates
Emergency services offered
"If you want honest, straight-forward, complete, and competitive pricing for a new HVAC system, go to Bluestar Air Mechanical. Our 21-year old systems needed replacement and we began our quotation/search process. Amongst the 7 companies we inquired with, Bluestar had the most comprehensive explanation, set of offerings, and was patient with us as we completed our comparisons. John promptly and completely answered all of my questions ranging from installation, future usage, efficiency, and advice on what was necessary vs an accessory. Lynn at the office was prompt and courteous on all of my scheduling, dispatch, and payment inquiries. You'll get top notch quality, service, and friendliness if you work with Bluestar for your HVAC replacement needs."
+13
Serving Colesville, MD and surrounding areas
Approved
Super Service Award Winner
In business since 2000
Free estimates
Emergency services offered
"I recently had a HVAC and water heater installation by Carroll Mechanical, Cris Lopez and his team. They were very respectful of my home and professional throughout the install. I am grateful and appreciative of working with the owner on deciding the HVAC unit to be installed. I found him to be the consummate professional, a person of integrity, transparent, responsive to my questions and willing to work with me to gain my business. I highly recommend Carroll Mechanical."
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