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Best boiler repair pros near Frederick, MD

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    Average homeowner rating
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    Verified boiler repairs reviews

Top-Rated Boiler repair pros in Frederick - Updated Nov 2026

Avatar for BlueStar Air Mechanical Inc.
BlueStar Air Mechanical Inc.
4.9(
32
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+13 more

Serving Frederick, MD and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"Very satisfied with responsiveness, punctuality and professionalism! Danny was able to squeeze us into Blue Star's full schedule at a time that worked for us and called before the visit for clarification about the problem, and after the visit about how things went. John called before arrival to let us know about exact timing, and was very thorough in investigating the problem and then explaining the situation. After consultation, he was able to repair our system. John also discussed what to look out for in case there are problems in the future. We have had our AC unit serviced regularly by other companies, but we will never use those other companies again. Blue Star is superior in every way! Cannot recommend highly enough. Thank you, Danny and John!!"
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+13

Response time3 hrs
Response rate100%
6 neighbors recently requested a quote
Avatar for Holtzople Heating, Air Conditioning, & Electrical Services
Holtzople Heating, Air Conditioning, & Electrical Services
4.9(
214
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service - For Business+12 more

Serving Frederick, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2002

Free estimates

Emergency services offered

"Happy Holidays all! Please use my Holtzople (H) review to help you address your HVAC needs! Last summer, my Trane AC unit failed. Corey W (H) was the tech that came out to the house and troubleshooted/resolved the problem (leaking refrigerant). He also advised on probability of future repairs. Sadly, the unit performed well for only a short time before failing. It was time to consider my options. Repairs were becoming more frequent and costly. Tyler (H System Designer) visited and walked around my house inspecting my current HVAC system. We discussed repairing or replacing my ailing AC unit. He recommended replacing with a split ductless system and emailed a quote for 1. Enhanced Mitsubishi hyper heat mini split system (system) 2. Favorable financing options - low interest rates and affordable monthly payments. The install took a week. H’s crew arrived each morning, respected my property, and worked as a team to carefully install the new system. With gratitude, John"
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+47

Response time1 day
Response rate100%
45 neighbors recently requested a quote
Avatar for Tim Kyle Electric Heating & Cooling
Tim Kyle Electric Heating & Cooling
4.9(
370
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+13 more

Serving Frederick, MD and surrounding areas

Approved

Super Service Award Winner

In business since 1986

Emergency services offered

Warranties offered

"I can’t say enough excellent things about Lance, the service technician who came out! We just purchased our first home so imagine our surprise when barely a month in the large grand chandelier fell from the ceiling in the early morning. I was going to replace it myself but remembered our home inspection pointed out some instances of aluminum wiring in the house so I thought I should have an electrician confirm the outlet was properly done before I go mucking around in the ceiling. Although it cost me an emergency dispatch fee, they had someone in my house first thing the very next morning. Lance was prompt and just so amazing - very kind and careful with keeping our house clean, taking care of the floors and finishings and really went above and beyond to help a very frazzled young family try figure out the mess they just purchased. While he was at our house we opted to have him also see if he could remove two outlets in the dining room from a dimmer switch so they can be always on. He explained the pricing up front and I knew what the job would cost as a final number before he began any work. For the first job, I was very impressed with how thorough and complete he was in taking care of not just the replacement chandelier, but even with safely disposing of the now broken old chandelier for us! He even offered to help move some boxes for the Salvation Army pick-up we had scheduled - I was just blown away by how kind and helpful he was! For the second job, I was so very pleased that he took the time to really figure out what was wrong. He ended up spending almost three hours discovering several issues - including things like faulty attempts at mitigating aluminum wire connection points in several outlets that we received confirmation prior to settling on the home had been fixed. He was able to come up with creative solutions to safely leverage what was already available to solve our problem and the best part is he really took the time to not only do it right, but to explain everything as he went and really helped me learn more about my house and how I can discover and resolve similar problems in the future. Being someone who is always trying to learn I really appreciated his willingness to answer my questions and share his depth of knowledge and experience! In the end, even though the job was a lot longer than either of us thought it would be, and even though the original cause for the emergency dispatch was already resolved, Lance made sure he stayed until we had a solution in place and we still only paid the initial quoted price! Yes, the price did seem a bit high compared to what I’ve seen on other provider’s quoted rates. However, the work really is just that good - absolutely worth it AND charging by the job instead of the hour takes all of the guessing out of how much you will need to pay, not to mention covers situations like this where the job ended up taking quite a bit longer than originally anticipated. We couldn’t be happier. We were so pleased with the service that we also signed up for their annual service plan to avoid emergency dispatch fees in the future and to get their annual safety inspection. There’s a lot of uncertainty associated with buying our first home, but at least we now know who we will call for all of our electrical needs!"
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+17

Response time1 day
Response rate100%
11 neighbors recently requested a quote
Avatar for Simply Home Service, LLC
Simply Home Service, LLC
5.0(
30
)
Gas Boiler or Radiator Heating System - Repair

Serving Frederick, MD and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"Sean was very prompt in responding to me request for service and did his absolute best to accommodate my schedule at my convenience. He was very flexible overall and helped get my AC repair ASAP after it was broken. This was especially helpful since it was getting warm outside! He was on time for all of our appointments and communicated what needed to be done/fixed clearly, so I wasn’t left with a huge bill that I wasn’t expecting. Expectations are very important and he seems to understand. I would highly recommend Sean and/or his team for any issues you might have for a cost effective and friendly solution. Thank you so much for your help Sean!"
Response time3 hrs
Response rate97%
Recommended by93%of homeowners
Avatar for MSR Heating and Cooling, LLC
MSR Heating and Cooling, LLC
4.8(
33
)
Gas Boiler or Radiator Heating System - Repair

Serving Frederick, MD and surrounding areas

Approved

In business since 2002

Free estimates

Emergency services offered

"I reached out to Angi’s to find a HVAC company to help with my AC that was blowing hot air in the summer. I got super lucky when I found MSR Heating and Cooling. They arrived on time and assessed my situation. I appreciated the time they took to explain the issue in ways I understood as well as recommend the best option for me. The estimate quote was fair and there were no surprise expenses to repair my unit. I can’t thank the owner, Moises enough for a job well done. His professionalism, knowledge and skills are reflected in the quality of work performed. I would highly recommend this company for your next repair."
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+8

Response time4 hrs
Response rate99%
2 neighbors recently requested a quote
Avatar for Buric Heating and Air Conditioning
Buric Heating and Air Conditioning
4.7(
20
)
Gas Boiler or Radiator Heating System - RepairBoiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For Business+7 more

Serving Frederick, MD and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"We initially called Davis and Davis when our A/C started blowing hot air. They came out three separate times, charged us money for repairs that didn't work, then decided we needed a full replacement for $4,500. We called Buric for a second opinion. Tom arrived on time, took 20 minutes to (correctly) find the problem, told us we didn't need a replacement, and repaired it for just over $400. It works great to this day. He pretty much restored our belief that honest technicians still exist in the world and saved us like $4,000. Only had one experience with them, but will always recommend them."
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+7

Response time8 hrs
14 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Carroll Mechanical, Inc.
Carroll Mechanical, Inc.
4.7(
25
)
Gas Boiler or Radiator Heating System - InstallOil Boiler or Radiator Heating System - Install

Serving Frederick, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2000

Free estimates

Warranties 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."
Ins
Ins
Response time10 hrs
273 neighbors recently requested a quote
Recommended by14%of homeowners
Avatar for TriState Home Services
TriState Home Services
4.6(
204
)
Boiler or Radiator Heating System - Install or ReplaceBoiler or Radiator Heating System - Install or Replace - For BusinessBoiler or Radiator Heating System - Repair or Service+13 more

Serving Frederick, MD and surrounding areas

In business since 1949

Free estimates

Emergency services offered

"Awesome! Someone answered right away when I called and told me a technician could be here in 30 minutes. It was actually only 20 minutes when Dan arrived and he was extremely professional and pleasant. He diagnosed the problem on our two systems, explained everything thoroughly with a reasonable repair estimate, then completed the work. He was here for about an hour and now the house is nice and cool, while it’s 95 degrees outside!"
Furnace Tune Up
Floor Heating System
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+2

Response time1 day
Recommended by91%of homeowners
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Boiler Repair FAQs, answered by experts

NATE (North American Technician Excellence) certification is not legally required for HVAC technicians in most areas, but hiring a professional with this certification is highly recommended. NATE-certified technicians demonstrated their expertise and proficiency in different types of HVAC systems, offering assurance of quality service. It's a voluntary certification, yet it indicates a commitment to professionalism and ongoing training. Choosing a NATE-certified technician often means you're working with someone who is up-to-date on industry standards and best practices, which can lead to better service, energy efficiency, and long-term cost savings.

After you receive your audit and report, review the findings and determine which of the prescribed changes you want to make to improve your home’s energy efficiency. Start by contacting the type of professionals recommended by the auditor who can help you remedy the issues discovered during the audit. Prioritize the projects by urgency, importance, and budget. Then, gather estimates from several professionals, remembering to verify any necessary licensing and experience information.

Once you know where your bleed valves are and how to use them, bleeding out heaters is a quick process. Expect it to take around 10 to 20 minutes, possibly longer if you have a lot of heaters or are still learning how they work. If you have a central bleed valve on your boiler, the process still takes the same amount of time. Make sure you have any keys necessary to turn the bleed valves on. Without bleed valves, the process should take around three hours.

If you're often struggling with radiator issues like chilly spots, leaks, or annoying noises, those are common indications that your radiator may need to be replaced. Corrosion, uneven heating, and persistent hissing sounds are common issues as well. When repairs become a regular chore and your home’s energy bills start to rise, a new radiator will bring the comfort and savings you need.

There are a couple of signs that will tell you it’s time to bleed the radiator. If the radiator is making noises, it’s typically because of trapped air, which you can release by bleeding the radiator. You can also test the radiator by turning on your heat and then placing your hand near the top and bottom of the radiator. If you feel cold spots, particularly at the top of the radiator, it’s time to bleed it.

The Frederick, MD homeowners’ guide to boiler repairs

From average costs to expert advice, get all the answers you need to get your job done.