Your Local HVAC Experts.

Specializing in the latest in energy and cost-efficient solutions for your home or business’ heating and cooling needs.

HVAC Services in Northern VA, MD, & DC:

Residential & Commercial Services

Smart HVAC Controls

Indoor Air Quality (IAQ) Systems

Variable Refrigerant Flow Systems

FREE Quote on Home HVAC Services!

Family Owned and Operated Since 1988

Anderson Mechanical Services, Inc. (AMSI) has been delivering award-winning HVAC services to homeowners, business owners, general contractors and property managers in Virginia, DC, and Maryland since 1988. Our reputation for excellence was built one project at a time by finding value-based HVAC solutions for our customers. We’ve built relationships through trust and customer service – and we use innovative HVAC technology to maximize the comfort and efficiency of your HVAC system.



Years of Experience


HVAC Services Completed

AMSI provides industry-best HVAC services

Located in Sterling, VA, we proudly serve customers in Virginia, Maryland, and DC. Our services include residential and commercial installation, repair, replacement, seasonal maintenance, design/build, and much more.

Types of HVAC Systems We Service:

  • Residential AC systems, heat pumps and furnaces
  • Commercial systems including packaged RTU and VAV systems, boilers, chillers, cooling towers, fresh air units (DOAS, ERU, ERV), kitchen makeup air and exhaust systems
  • Variable Refrigerant Flow (VRF) Systems
  • Internal Air Quality (IAQ) Systems including UVGI and HEPA filtering systems
  • HVAC Control Systems

    Call for Service


    HVAC Service Plan, $289 Per Year

    Gain peace of mind with Anderson Mechanical’s HVAC Service Plan. The plan includes:

    • Two Service Visits Per Year. One heating and one cooling full service to ensure your HVAC system is properly maintained and working at the highest possible efficiency year-round.
    • Priority Emergency Service.  In the event of an emergency request, service plan customers are our top priority.
    • Savings & Specials. 10% off all additional service work including repair, replacement, installation of humidifiers and air purifiers, smart thermostat upgrades, and more, as well as access to special deals and discount packages.
    • Unmatched Quality.  You’ll have peace of mind knowing that your system is being taken care of by an experienced technicians who is graded on their quality of work and customer communication, not their sales numbers.

    Spring Home Service Specials

    Save Up to $1,000

    For a limited time save with the installation of a new Daikin energy-efficient heat pump system with an instant cash rebate.

    *Must be purchased and installed by September 30, 2020.

    Air Cleaners & Purifiers

    Save on the Purchase and Installation of Qualifying IAQ Products like Air Cleaners & Purifiers

    $99 Home HVAC Maintenance

    Don’t wait to find out if your AC is going to work this summer! $99 for an Industry Best Seasonal HVAC Maintenance (normally $150)

    Save up to $1,000 on a Daikin Home Comfort System
    Don’t Wait, Offer Expires 09/30/2020!

    Worried about your AC system as summer approaches? Don’t wait to find out. Call us for a free estimate and to learn how you can qualify for an instant cash rebate when you purchase a new Daikin Home Comfort System.

    Customer Testimonials

    “AMSI is my preferred home service HVAC company.  They continue to succeed my expectations.  I would recommend them on all aspects of their operation – from communication, cleanliness, timelines always being met and service.  They are always spot on.”


    Round Hill, VA

    “AMSI has done service repairs and replaced new equipment for us for over 25 years. Always very prompt on service repairs which, to us, is very important because of having rental properties.  Very knowledgeable and polite, from the office to the outside employees.”


    Leesburg, VA

    “AMSI did such a great job helping us through our HVAC replacement process.  The field staff was knowledge and gave an in-depth explanation.  The installers were polite, professional, and eager to exceed our expectations. We would highly recommend AMSI!”


    Leesburg, VA

    FREE Estimate Today!