Business Details
36 Years
experience
Emergency
services
Your Trusted HVAC & Plumbing Experts in Sterling, VA
Donmar has been a trusted provider of HVAC and plumbing services in Northern Virginia and Maryland since 1990. Our team of NATE-certified technicians and licensed plumbers delivers energy-efficient solutions tailored to each customer's unique needs. As a Carrier Factory Authorized Dealer, we combine industry-leading technology with rigorous training to ensure superior installation and repair services. We prioritize transparent communication, offering multiple financing options and free estimates to accommodate diverse budgets.Our commitment to punctuality, clean workspaces, and ongoing staff development has earned us recognition through thousands of satisfied customer referrals. With over 30 years of operational history, we maintain a drug-free workplace and invest in continuous professional development for our technicians. Our service area spans Northern Virginia, Maryland, and Washington D.C., addressing residential heating, cooling, and plumbing requirements with equal expertise in emergency and scheduled maintenance contexts.
Services
Air Conditioning Repair
Heating Services
Emergency HVAC
Water Heaters
Plumbing Services
Ductless Mini-Splits
Indoor Air Quality
Gas Furnace Services
Heat Pump Installation
Tankless Water Heaters
Details
- Year established: 1990
Highlights and features
- We have over 34 years of experience serving Northern Virginia and Maryland
- Our technicians hold NATE certification, the HVAC industry's premier credential
- We provide 24/7 emergency HVAC services with no additional fees
- We offer energy-efficient solutions with available federal tax credits
- We maintain a drug-free workplace with ongoing professional development programs
Associations and certifications
- Carrier Factory Authorized Dealer
- NATE Certification
What people say
Outstanding customer service
Efficient furnace replacement
Honest recommendations
Impeccable workmanship
Attentive staff
Services
Air Conditioning Repair
Our NATE-certified technicians provide comprehensive air conditioning repair services for residential systems. Using advanced diagnostic tools, we identify and resolve cooling issues efficiently while maintaining energy efficiency standards. Customers benefit from our 24/7 emergency response capability and transparent pricing structure that includes available manufacturer rebates.
Heating Services
We offer complete heating system services including furnace repair, boiler maintenance, and heat pump installation. Our technicians work with all major brands and prioritize energy-efficient solutions that qualify for federal tax credits. Emergency heating repairs are available with no overtime charges during cold weather emergencies.
Emergency HVAC
Our emergency HVAC services operate seven days a week with guaranteed response times. Technicians carry essential replacement parts for common system failures and use real-time GPS tracking for accurate arrival estimates. Emergency service calls receive priority scheduling without additional fees after regular business hours.
Water Heaters
We install and service conventional and tankless water heating systems with energy-efficient models that qualify for federal tax credits. Our technicians provide same-day repairs for major failures and maintain proper venting and safety certifications for gas-powered units. Maintenance plans extend system longevity and efficiency.
Plumbing Services
Our licensed plumbers handle residential repairs, fixture installations, and pipe system maintenance. Services include leak detection, drain cleaning, and emergency water shut-off procedures. We use modern trenchless repair methods where applicable and ensure all work meets local building code requirements with proper permitting assistance.
People
Donald Wills
President
Donald Wills leads Donmar with over three decades of HVAC industry experience. He established the company's commitment to technical excellence and customer satisfaction, maintaining NATE certification standards and Carrier Factory Authorized Dealer status while expanding service capabilities across three states.
Questions
Do you offer emergency HVAC services?
Yes, we provide 24/7 emergency HVAC services with no overtime charges for after-hours repairs.
Are financing options available?
Yes, we offer flexible financing options with approved credit for all our HVAC and plumbing services.
What areas do you service?
We serve Northern Virginia, Maryland, and Washington D.C., including specific counties listed on our service area page.
Do technicians arrive on time?
Yes, we use GPS tracking technology to provide real-time technician location updates and accurate arrival windows.
Are energy-efficient rebates available?
Yes, we help customers access federal tax credits and local utility rebates for energy-efficient system upgrades.
What certifications do technicians hold?
Our HVAC technicians maintain NATE certification, and all staff undergo regular training programs for industry advancements.
