Business Details
36 Years
experience
Emergency
services
Trusted HVAC & Plumbing Services in Sterling, VA
Donmar Heating, Cooling & Plumbing Heating, Cooling & Plumbing has been a trusted provider of HVAC and plumbing services in Northern Virginia, Maryland, and the District of Columbia for over 30 years. Our team of NATE-certified technicians and licensed plumbers combines cutting-edge technology with time-tested expertise to deliver energy-efficient solutions tailored to each customer's unique needs. We prioritize transparency, offering flat-rate pricing and upfront cost explanations, while our 24/7 emergency services ensure uninterrupted comfort during critical moments.Our commitment to green technology and energy efficiency is reflected in our partnerships with industry leaders like Carrier, and our ongoing professional development programs keep our team at the forefront of HVAC innovation. With a focus on community and customer satisfaction, we have built a reputation for reliability, earning recognition through thousands of referrals from satisfied homeowners.
Services
HVAC Repairs
Air Conditioning
Heating Systems
Water Heater Installation
Plumbing Services
Indoor Air Quality
Emergency Services
Maintenance Agreements
Gas Line Repair
Sump Pump Services
Details
- Year established: 1990
Highlights and features
- Over 30 years of experience serving Northern Virginia and Maryland
- NATE-certified technicians for industry-leading HVAC expertise
- 24/7 emergency services for urgent heating and cooling needs
- Energy-efficient solutions with available federal tax credits
- Transparent flat-rate pricing with no hidden fees
Associations and certifications
- Carrier Factory Authorized Dealer
- NATE Certified
What people say
Outstanding customer service
Honest recommendations
Efficient furnace replacement
Attentive to concerns
Uniformly fantastic employees
Services
HVAC Repairs
Our NATE-certified technicians provide prompt HVAC repairs for heating and cooling systems. We diagnose issues like refrigerant leaks, thermostat malfunctions, and electrical component failures using advanced diagnostic tools. Customers receive clear explanations of repair options, including cost-benefit comparisons for repair versus replacement scenarios.
Air Conditioning
We offer comprehensive AC services including installation, repair, and maintenance of central air conditioning systems. Our team ensures proper system sizing for energy efficiency and provides solutions for uneven cooling, high humidity, and refrigerant issues. Emergency repair services are available 24/7 during peak cooling seasons.
Heating Systems
Professional heating services cover gas furnace repair, boiler maintenance, and heat pump installations. We perform annual heat loss calculations to recommend appropriately sized systems and offer emergency heating repairs with no overtime charges during cold weather months.
Water Heater Installation
We service all major water heater brands and offer tankless water heater conversions. Our plumbers handle gas line connections, pressure testing, and permit requirements for installations. We address common issues like sediment buildup, anode rod replacement, and temperature regulation problems.
Plumbing Services
Our licensed plumbers handle residential plumbing needs including leak detection, pipe repair, and fixture installations. We offer sump pump services with battery backup systems and gas line repair solutions that meet local code requirements in Northern Virginia and Maryland.
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 and energy-efficient solutions while maintaining family-oriented business values.
Questions
How often should I service my HVAC system?
We recommend bi-annual maintenance: once before summer for AC and once before winter for heating systems to ensure optimal performance.
What are signs my AC needs repair?
Watch for weak airflow, warm air output, unusual noises, frequent cycling, or increased energy bills indicating potential system issues.
Do you offer emergency HVAC services?
Yes, we provide 24/7 emergency services with no overtime charges for urgent heating and cooling repairs.
How can I improve home energy efficiency?
Upgrade to ENERGY STAR systems, schedule regular maintenance, and consider smart thermostat installation for optimized energy consumption.
What financing options are available?
We offer flexible financing plans with approved credit for system replacements and major repair projects to accommodate budget needs.
Are your technicians certified?
All HVAC technicians are NATE-certified, and plumbers hold valid state licenses with ongoing professional development training.
