Mannix Heating & Cooling, LLC

HomeAdvisor screened and approved seal

HomeAdvisor Screened & Approved

This service professional has passed the HomeAdvisor screening process.

Learn about our screening process
Learn about our screening process

13 Years In Business

Company Details

  • Verified Licenses


26955 Gum Spring Road
Chantilly, VA 20152


  • Mon: 8:00 AM - 5:00 PM
  • Tue: 8:00 AM - 5:00 PM
  • Wed: 8:00 AM - 5:00 PM
  • Thu: 8:00 AM - 5:00 PM
  • Fri: 9:00 AM - 1:00 PM
  • Sat: 9:00 AM - 1:00 PM
  • Sun: 8:00 AM - 5:00 PM
View All Details & Credentials


Service Details

    Areas of Expertise

    • Central A/C - Install, Service, Repairs
    • Central Humidifier - Install or Replace, Service, and Repairs
    • Gas or Electric Furnace: Install, Service, Repairs
    • Heat Pump - Install or Replace, Repairs, and Service
    View All Offerings and Cities Served

    Cost Information

    • Free Estimates
    • Warranty Offered
    • Credit Cards Accepted


    57 Verified Reviews
    • 5
    • 4
    • 3
    • 2
    • 1

    Highly rated for

    • Quality
    • Value
    • Customer Service
    Showing 1-10 of 57 results
    5.0 Mark T. Herndon, VA

    Excellent HVAC service provider all round

    5.0 David K. Herndon, VA

    Of all of the five companies I interviewed, Mannix provided the price and services for the cost.

    5.0 Sam C. Alexandria, VA

    Absolutely stunned how quickly they were able to come and quote me and then install the system the next day. The system they installed in light years better than what we had before and we are saving so much money on electricity! The staff is amazing and while I hope to not need their services again anytime soon, I will definitely be using them the next time service is needed.

    5.0 Naeem K. Centreville, VA

    Their extremely professional, getting called on time and would without any hesitation recommend this contractor.

    5.0 Mary P. Reston, VA

    These are true professionals and customer service is down to a tee. Excellent job with replacing my AC and they went above and beyond!

    5.0 Johnny I. Rockville, MD

    Steve, Richard and Charles are true professionals! They replaced my old AC and furnace with a new system. They were on time, and cleaned up very nicely when they finished. They took the time to expalin how the system works and made sure I was happy before they left. I will recommend them to my family and friends.


    The flame sensor on my furnace broke and only provided partial heat to my house. I made an emergency call on Saturday and Mark, a service technician, showed up within 2 hours. He was courteous, professional and installed a new sensor. He also checked out the furnace and replaced the filter with a new one of mine. Before he left, he explained everything he did.


    Mannix Heating & Cooling, LLC
    Our trucks
    Two Carrier Infinity systems

    HomeAdvisor allows Service Professionals to post information about themselves and their business on their profile. HomeAdvisor does not review or verify the information representations set forth in those profiles as they are self-reported by the Service Professional.

    HomeAdvisor verifies state-level licensing where applicable - note: some states require local or county level licensing and you should verify whether or not your pro is properly licensed.
    To find more licensing information for your state, visit our Licensing Requirements page.

    Seal of Approval

    What is the screening process that Service Professionals go through in order to become members of the HomeAdvisor network?

    1. Verify Trade License
      HomeAdvisor checks to see if the business carries the appropriate state-level license.
    2. Verify Insurance
      As a part of our screening process, we encourage professionals to carry general liability insurance. We require coverage for hundreds of services.
    3. Verification of State Business Filings
      For business types that require a Secretary of State filing, we confirm that the business is in good standing in the state in which it is located.
    4. Criminal Records Search
      HomeAdvisor uses 3rd party data sources to conduct a criminal search for any relevant criminal activity associated with the owner/principal of the business.
    5. Sex Offender Search
      We confirm that the owner/principal is not listed on the official state Sex Offender web site in the state in which the owner/principal of the company is located.
    6. Bankruptcy Search
      We use 3rd party data sources to check the history of the principal/owner of the business for bankruptcy filings by or against them.
    7. Legal Search for Civil Judgments
      We use 3rd party data sources to check the principal/owner of the business for state level civil legal judgments entered against them.
    8. Liens Search
      We use 3rd party data sources to check the principal/owner of the business for liens placed against them.
    9. Identity Verification (SSN)
      HomeAdvisor verifies the social security number(s) of the owner/principal for identity check purposes. This check applies primarily to smaller business entities.
    10. Identity Verification (Reverse Phone Lookup)
      We conduct a reverse business phone lookup to identify records matching the phone number information provided by the business.

    NOTE: Member service professional information confirmed as described above may change or expire over time; while HomeAdvisor attempts to maintain accurate and up-to-date information, and confirms changes when notified, we cannot guarantee that profile and screening information is accurate. Therefore, we recommend that before working with a service professional you verify that information presented is still current and/or acceptable to you.
    Please see HomeAdvisor's Terms and Conditions for a full description of how we screen Service Professionals

    **Only for U.S. service professionals

    Final Step - Confirm Your Appointment:

    Confirm your appointment with on , - Change


    By clicking Confirm Appointment, you affirm you have read and agree to the HomeAdvisor Terms & Conditions, and you agree and authorize HomeAdvisor and its affiliates, and their networks of Service Professionals, to deliver marketing calls or texts using automated technology to the number you provided above regarding your project and other home services offers. Consent is not a condition of purchase.