

Get matched with top central a/c installers in Knoxville, MD
Enter your zip and get matched with up to 3 pros
Matching on HomeAdvisor
Find Central a/c installers in Knoxville


Angi Approved
In business since 1949
Free estimates
Emergency services offered
"Great service very prompt and easy to work with."

Angi Approved
In business since 2008
Free estimates
Emergency services offered
"My AC failed and I had limited time to find a good solution, I made a phone call to Relax HVAC based on the online reviews and it was a great decision. Nasser came to check the situation, he gave a very detailed and comprehensive overview of the situation and provided with the options I had. I decided to replace the unit, Nasser went above and beyond to find a unit delivery service but there was nothing available over the weekend so this gentleman went for unit pick up himself and finished the installation within a day from my initial call. Moreover, the provided price was very reasonable.I can't be more happy with the outcome and highly recommend Relax HVAC"

Angi Approved
In business since 1936
Free estimates
Emergency services offered
"We bought a new construction and McCrea installed the HVAC. Home inspection identified the heat pump was not working in Oct. 2020. McCrea identified it was due to leaking refrigerants and promise fixed the issue. Our electric bill was extremely high the following two months and the heat pump was not cooling in Spring 2021. McCrea sent technician and again repaired the system. Bought their maintenance plan. We had 4+ repairs plus regular tune up in the past two years. Last week the heat pump stopped cooling again. We are out of labor warranty and charge us with $89 diagnostic cost after membership discount. It took three days for them to send someone to check while we suffering 90F in our house. They identified the compressor dead and need replacement. They charge $1900 for labor after membership discount. Most likely cause of the compressor failure is "suicide" with assistance. Low refrigerant at beginning and over change in later repairs likely contributed the short life."

Angi Approved
Super Service Award Winner
In business since 1982
Free estimates
Emergency services offered
"DC Area - Presidential Heating. We have a two-zone system to cover basement+first floor and separately the second floor and both failed, unbelievably, within a few days of each other while on a trip. Late morning on a Sunday I googled emergency HVAC and saw all these 2 star companies and then I saw an impossibly high rating for Presidential Heating and that they don't charge extra for weekends. Ayite (fantastic) came out and fixed both systems and they were way more than reasonable. And now we have heat upstairs and downstairs! yaaaaaaaa. Our previous HVAC company got their scruples from the Sopranos while Presidential is a godsend."

Angi Approved
In business since 2004
Free estimates
Emergency services offered
"I would strongly recommend against using this company. Michael Bonsby sold me an HVAC system that repeatedly malfunctioned between its installation in August 2022 and removal in October 2025. Over those 3 years, Bonsby had ample opportunities to identify and correct the defect in the system, but it failed to do so. Nor did Bonsby ever offer to replace the system. In fall 2025, after years of frustration, I requested that Bonsby refund my purchase price for the defective system. Bonsby has refused and, in doing so, made arguments that are materially inaccurate as to the facts of the matter and applicable law. "

Angi Approved
In business since 2012
Free estimates
Emergency services offered
"They did a good job"

Angi Approved
In business since 2014
Free estimates
Emergency services offered
"Great folks to work with"

Angi Approved
In business since 1970
Free estimates
Warranties offered
"Highly professional, knowledgeable and well behaved technician. Prices offered were good too. I definitely recommend the company."

Angi Approved
In business since 1903
Emergency services offered
Warranties offered
"Good professional work!"
The Knoxville, MD homeowners’ guide to central a/c installations
From average costs to expert advice, get all the answers you need to get your job done.

The cost of replacing an AC unit fan motor depends on warranties, labor, season, and more. This cost guide covers everything you need to know about this HVAC part.

Discover the cost of window AC installation, exploring factors like unit size, labor rates, outlet installation, accessories, and disposal fees.

Budget for AC coil cleaning costs based on factors such as cleaning frequency, coil type, cleaning method, accessibility, ongoing maintenance, and more.

Need an AC Recharge? Here’s how much it costs, what factors affect cost, and what to expect.

Budget for AC capacitor replacement costs based on factors such as the capacitor type, size, labor, potential repairs, location, season, and more.

Wondering who installs whole-house humidifiers? Hire a licensed HVAC technician. Learn what they do, other pro options, and how to hire confidently
- Birmingham
- Phoenix
- Tucson
- Fresno
- Long Beach
- Los Angeles
- Modesto
- Sacramento
- San Diego
- San Francisco
- San Jose
- Denver
- Hartford
- Washington DC
- Fort Lauderdale
- Jacksonville
- Miami
- Orlando
- Tampa
- Atlanta
- Chicago
- Indianapolis
- Louisville
- New Orleans
- Baltimore
- Boston
- Detroit
- Grand Rapids
- Minneapolis
- Saint Paul
- Kansas City
- Saint Louis
- Las Vegas
- Albany
- New York
- Asheville
- Charlotte
- Greensboro
- Raleigh
- Winston Salem
- Cincinnati
- Cleveland
- Columbus
- Oklahoma City
- Portland
- Harrisburg
- Philadelphia
- Pittsburgh
- Providence
- Memphis
- Nashville
- Austin
- Dallas
- El Paso
- Fort Worth
- Houston
- San Antonio
- Salt Lake City
- Norfolk
- Richmond
- Virginia Beach
- Seattle
- Madison
- Milwaukee