Business Details
36 Years
experience
Emergency
services
Your Trusted HVAC & Plumbing Experts in Northern Virginia
Donmar Heating, Cooling & Plumbing Heating, Cooling & Plumbing has served Northern Virginia, Maryland, and Washington D.C. for over 30 years, establishing itself as a trusted leader in HVAC and plumbing services. Our NATE-certified technicians combine technical expertise with a commitment to personalized solutions, addressing each customer's unique needs with energy-efficient technologies and transparent communication. We prioritize customer satisfaction through 24/7 emergency services, flexible financing, and a rigorous hiring process that ensures only licensed professionals with clean backgrounds join our team.Our partnership with Carrier as a Factory Authorized Dealer underscores our dedication to industry excellence, while our focus on green technologies reflects our environmental responsibility. With over 19,500 satisfied customers, we maintain a legacy of reliability, punctuality, and honest pricing, supported by management agreements for ongoing system maintenance and performance optimization.
Services
HVAC Repairs
Air Conditioning
Heating Systems
Water Heaters
Plumbing Services
Indoor Air Quality
Emergency Services
Maintenance Plans
Energy Efficiency
Gas Line Repair
Details
- Year established: 1990
Highlights and features
- Over 30 years of experience serving Northern Virginia and Maryland
- NATE-certified technicians for industry-leading expertise
- 24/7 emergency services with no extra charges
- Flexible financing options with approved credit
- Energy-efficient solutions with federal tax credit guidance
Associations and certifications
- Carrier Factory Authorized Dealer
- NATE Certified
What people say
Outstanding customer service
Uniformly fantastic employees
Efficient furnace replacement
Honest recommendations
Impeccable workmanship
Services
HVAC Repairs
Our NATE-certified technicians provide prompt diagnostics and repairs for all HVAC systems, minimizing downtime during critical temperature extremes. We handle refrigerant leaks, compressor failures, thermostat issues, and more while explaining repair options transparently. Emergency services operate 24/7 with no additional charges for nights or weekends, ensuring comfort restoration when you need it most.
Air Conditioning
From routine maintenance to emergency repairs and system installations, we specialize in optimizing cooling efficiency for Northern Virginia's humid summers. Our services include AC tune-ups, refrigerant management, ductless mini-split installations, and energy-efficient upgrades with available tax credits. We prioritize proper system sizing to prevent energy waste while maintaining consistent indoor comfort.
Heating Systems
We service all heating system types including gas furnaces, heat pumps, and boilers with annual maintenance plans to extend equipment lifespan. Our technicians perform heat loss calculations for accurate system sizing, offer emergency heating repairs during winter months, and provide energy audits to identify efficiency improvements that qualify for federal incentives.
Water Heaters
Our plumbing experts handle traditional tank and tankless water heater installations, repairs, and maintenance. We diagnose sediment buildup, heating element failures, and pressure issues while offering energy-efficient replacements with proper permitting. Emergency services address sudden hot water loss, and we provide maintenance plans to maximize system longevity.
Plumbing Services
We address residential plumbing needs from leaky faucets to complete repiping projects, with expertise in gas line installations and frozen pipe emergencies. Our service vans carry common replacement parts for same-visit repairs, and we offer sump pump installations with battery backup systems to prevent basement flooding during Virginia's severe weather events.
People
Donald Wills
President
Donald Wills leads Donmar Heating, Cooling & Plumbing Heating, Cooling & Plumbing with over 30 years of industry experience, focusing on customer satisfaction through technical excellence and ethical business practices. He oversees operations ensuring adherence to Carrier Factory Authorized standards while maintaining the company's founding commitment to Northern Virginia communities.
Questions
How often should HVAC systems receive professional maintenance?
We recommend bi-annual maintenance (spring and fall) to optimize system efficiency, identify potential issues early, and maintain manufacturer warranties while extending equipment lifespan.
What indicates an HVAC system needs immediate repair?
Unusual noises, inconsistent temperatures, sudden energy bill spikes, and visible refrigerant leaks require prompt professional attention to prevent further system damage and efficiency loss.
How does Donmar Heating, Cooling & Plumbing Heating, Cooling & Plumbing support energy-efficient home improvements?
We offer energy audits, install high-efficiency HVAC systems with available tax credits, and provide guidance on government rebates while using GPS-tracked service calls to minimize unnecessary visits.
What emergency HVAC services are available?
Our 24/7 emergency services respond promptly to heating and cooling failures with no extra charges for nights or weekends, backed by fully stocked service vehicles for immediate repairs.
How are repair costs determined?
We provide upfront pricing with detailed explanations of repair options, including cost-benefit analyses for repair versus replacement decisions while honoring current promotional offers.
