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TRUSTED BY THURMONT, MD HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon246
    Verified heating and air conditioning services reviews

Top-Rated Heating and air conditioning pros in Thurmont - Updated Nov 2026

Avatar for Holtzople Heating, Air Conditioning, & Electrical Services
Holtzople Heating, Air Conditioning, & Electrical Services
4.9(
215
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallGas Furnace / Forced Air Heating System - Repair+41 more

Serving Thurmont, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2002

Free estimates

Emergency services offered

"Kevin arrived today for the Spring Preventive Maintenance service on our HVAC system that we purchased a few years ago from Holtzople Heating & Air Conditioning. As always, we received an email and a phone call to let us know when the HVAC technician would be arriving. The Holtzople HVAC technicians are always very professional, clean, thorough, and polite and friendly. They are always willing to answer any questions we have, and their expertise and experience are evident in the excellent service they provide."
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+47

Response time1 day
Response rate100%
36 neighbors recently requested a quote
Avatar for McCrea Heating & Air Conditioning Services of PA
McCrea Heating & Air Conditioning Services of PA
4.7(
317
)
Central A/C - InstallElectric Furnace / Forced Air Heating System - InstallCentral A/C - Service or Repair+21 more

Serving Thurmont, MD and surrounding areas

Approved

In business since 1936

Free estimates

Emergency services offered

"Rob was the service technician who came by for check up on our Trane AC Unit. He was professional and courteous. He took time to explain and label damper settings for future reference. He was the best HVAC technician I have ever encountered thus far. Rob is definitely an asset to McCrea company. If I ever need service again, I want Rob to be the one to service my AC Unit. Thank you!"
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8 neighbors recently requested a quote
Recommended by95%of homeowners
Avatar for Tetteris HVAC
Tetteris HVAC
4.7(
192
)
Central A/C - InstallCentral A/C - Service or RepairDuctless Mini-split A/C - Install or Replace+6 more

Serving Thurmont, MD and surrounding areas

Approved

In business since 2016

Free estimates

Emergency services offered

At Tetteris HVAC, we take great pride in our 25 years of experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety and quality, regardless of how large or small the job. Call us today!

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11 neighbors recently requested a quote
Recommended by94%of homeowners
Avatar for Harrell's Services
Harrell's Services
5.0(
6
)
Central A/C - InstallGas Furnace / Forced Air Heating System - RepairBoiler or Radiator Heating System - Install or Replace+47 more

Serving Thurmont, MD and surrounding areas

Approved

In business since 1989

Free estimates

Emergency services offered

"I have an annual contract with R.W. Harrell's Pump Service to clean and service the heating and A/C systems at my home. Their employees and always prompt, courteous and professional and ALWAYS do an excellent job with cleaning up before they leave. Their prices are reasonable and I like dealing with locally owned companies as opposed to the nationally owned companies. I would highly recommend R.W. Harrell to all of my friends and relatives for their HVAC needs.
"
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+5

5 neighbors recently requested a quote
Recommended by80%of homeowners
Markool Heating & Cooling, LLC
4.7(
21
)
Air Ducts & Vents - CleanCentral A/C - InstallGas Furnace / Forced Air Heating System - Install+22 more

Serving Thurmont, MD and surrounding areas

Approved

In business since 2019

Free estimates

Warranties offered

"⭐⭐⭐⭐⭐ Exceptional and Honest Local Service"I cannot recommend Markool Heating & Cooling enough! They were prompt, incredibly professional, and truly care about getting the job done right without overcharging. As a smaller local business, you get highly personalized care and direct communication with the people actually doing the work. They are my go-to for all HVAC needs.""
Response time7 hrs
5 neighbors recently requested a quote
Recommended by84%of homeowners
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Heating and Air Conditioning FAQs, answered by experts

If you have central air conditioning, it’s fine to run your AC all day if that’s what you want—as long as the AC unit is in good condition. But if your AC runs constantly when you don’t want it to, there may be a problem with your system (like the ones we’ve mentioned above). Window AC units and wall air conditioners aren’t as powerful as central AC, so you should only run those kinds of air conditioners for eight to 12 hours at a time.

If both your furnace and AC unit are more than a decade old, it may be a good idea to replace both of them. However, your furnace can last up to three decades, and your air conditioner can typically last up to 15 years, so consulting with a pro before deciding to replace both of them is best. If it’s before that time limit for each, you can fix many problems with repairs or just replace one.

Here’s the cost formula to find out how much it’ll cost you to run a window air conditioner in your home:  Watts * (hours used) / 1,000 * (Local kWh) = daily cost of running a window unit. If you need help calculating the cost of running your window AC unit, consult an AC repair or installation pro for an accurate estimate.

A common HVAC rule is that for every 500 to 600 square feet of living space, you need 1 ton of heating or cooling capacity. Now that you know this common rule, you also need to know that it isn’t very accurate, and a dedicated pro wouldn’t use it for your home. If you talk to a pro who won’t or can’t perform a proper Manual J calculation, consider hiring someone more thorough.

Troubleshooting common issues with your AC often sheds light on a problem with the compressor. Signs that you need to replace a bad compressor include your AC blowing warm air, short cycling (turning on and off), making strange noises, and blowing less air overall. Since these problems can stem from several areas of your AC, always call a local AC repair team to confirm it's the compressor.

The Thurmont, MD homeowners’ guide to heating and air conditioning services

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