Business Details
36 Years
experience
Emergency
services
Trusted HVAC & Plumbing Services in Northern Virginia & Maryland
Donmar Heating, Cooling & Plumbing Heating, Cooling & Plumbing has served Northern Virginia and Maryland since 1990, delivering trusted HVAC and plumbing solutions to over 19,500 customers. Our NATE-certified technicians, backed by Carrier Factory Authorized Dealer status, combine cutting-edge technology with personalized service to address unique home comfort needs. With a 30-year legacy of excellence, we prioritize transparent recommendations, energy-efficient systems, and 24/7 emergency support. Our team undergoes rigorous training and background checks, ensuring professionalism and reliability.Recognized for exceptional customer service, we offer flat-rate pricing, financing options, and manufacturer rebates to make high-quality systems accessible. Licensed in Virginia, Maryland, and Washington, D.C., we serve 15+ communities with prompt, budget-conscious service. Customer testimonials highlight our punctuality, technical expertise, and commitment to resolving HVAC and plumbing challenges efficiently. We maintain industry-leading standards through ongoing staff development and a family-oriented workplace culture.
Services
Air Conditioning Repair
Heating Installation
Emergency HVAC Services
Water Heater Replacement
Plumbing Services
Ductless Mini-Split Systems
Indoor Air Quality Solutions
Furnace Maintenance
Heat Pump Installation
Tankless Water Heaters
Details
- Year established: 1990
Highlights and features
- NATE-certified technicians with ongoing professional development
- Carrier Factory Authorized Dealer since 1990
- 24/7 emergency HVAC services available
- Energy-efficient solutions with manufacturer rebates
- 30+ years serving Northern Virginia and Maryland communities
Associations and certifications
- Carrier Corporation
- North American Technician Excellence (NATE)
What people say
Outstanding customer service
Efficient and effective furnace replacement
Honest and straightforward recommendations
Uniformly fantastic employees
Impeccable workmanship
Services
Air Conditioning Repair
Our NATE-certified technicians diagnose and repair all AC systems, ensuring optimal cooling performance. We offer same-day service for urgent issues and provide transparent pricing with no hidden fees. With access to Carrier's premium parts inventory, we complete repairs efficiently while maximizing system longevity and energy efficiency.
Heating Installation
We install high-efficiency heating systems including gas furnaces and heat pumps. Our experts help select ideal systems based on home size and climate needs, offering models with up to 97% AFUE efficiency. We handle complete system replacements and coordinate utility rebates to reduce installation costs for Virginia and Maryland homeowners.
Emergency HVAC Services
Available 7 days a week for urgent HVAC failures, our emergency service responds promptly to critical heating and cooling issues. Technicians carry essential diagnostic tools and replacement parts to resolve common system failures immediately, minimizing home comfort disruptions during extreme weather conditions in the DC metro area.
Water Heater Replacement
We supply and install energy-efficient tankless and hybrid water heaters with federal tax credit eligibility. Our technicians properly size units for household demand and handle all plumbing connections. We offer models with extended warranties and coordinate manufacturer rebates to improve cost-effectiveness for residential customers in Northern Virginia.
Ductless Mini-Split Systems
Specializing in ductless HVAC solutions, we install multi-zone mini-split systems for homes without existing ductwork. Our experts design configurations that optimize energy efficiency while providing independent temperature control for different living spaces across Maryland and Virginia residences.
People
Donald Wills
President
Donald Wills leads Donmar Heating, Cooling & Plumbing Heating, Cooling & Plumbing with over 30 years of HVAC industry experience. He established the company's customer-first philosophy, emphasizing technical excellence and ethical business practices while expanding service capabilities across the Washington, D.C. metro area.
Questions
What HVAC services do you offer in Northern Virginia?
We provide full-service HVAC solutions including AC repair, heating installation, emergency services, ductless systems, and indoor air quality improvements across Northern Virginia and Maryland.
Do you offer emergency HVAC repair services?
Yes, we provide 7-day emergency HVAC repair services with prompt response times for critical heating and cooling system failures in all served areas.
Are financing options available for HVAC replacements?
We offer flexible financing options with approved credit for HVAC system replacements, including special promotions and manufacturer rebates to improve affordability.
What makes your technicians qualified for HVAC work?
All technicians are licensed, background-checked, and NATE-certified with ongoing training. As a Carrier Factory Authorized Dealer, we maintain the highest industry standards for technical expertise.
Do you service both residential and commercial properties?
While we primarily serve residential customers, our team handles light commercial HVAC projects. Our service agreements and equipment offerings cater to both home and small business needs.
What areas do you service besides Northern Virginia?
We serve all Maryland suburbs of Washington, D.C. including Bethesda, Rockville, and Gaithersburg, plus Washington, D.C. itself through our licensed operations in multiple jurisdictions.
Reviews (3)
Themis Kalaris
Oct 10, 2018
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I have been using Donmar Heating and Cooling for many years to service several ACS and heat pumps and they keep on doing a great job. I highly recommend them.
Jacque DiQuirico Thornbrough
Jul 12, 2018
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We have used Donmar for more than 20 yrs. they are always responsive and professional. Mark has serviced our heat pump many times and is always on time, quick, thorough and professional. I highly recommend Donmar on all counts.
Jennifer Torregrossa
Jul 02, 2018
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I called Donmar Hearing and Cooling at 9am on a Saturday (the first day of a multiple day heatwave).They had someone out to me in less than an hour! Luckily the repair was just a loose wire, but they were honest about it and only charged the minimum repair cost (hundreds and hundreds less than I was prepared for). Will definitely use them again and recommend them to anyone and everyone I can!
