Commercial HVAC Services
We proudly serve Gaithersburg, Frederick, Southern Washington D.C., and surrounding Maryland communities within a 50-mile radius.
Fill out the form below for a quick quote:
*All fields required
Customized Climate Control for Your Business
When it comes to running a business, comfort and efficiency are key—not just for your team, but for your customers, too. We proudly serve business owners across Gaithersburg, Frederick, Southern Washington D.C., and surrounding Maryland communities within a 50-mile radius. With over 8 years of experience and EPA 608 certification, we deliver professional service you can count on.
Please Note: We do not provide ductwork design or equipment tonnage/load calculations. Our team strictly handles replacements of existing HVAC units, ensuring a smooth and efficient upgrade process.
Please Note: We do not provide ductwork design or equipment tonnage/load calculations. Our team strictly handles replacements of existing HVAC units, ensuring a smooth and efficient upgrade process.
HVAC System Installation
Installing the right HVAC system is essential for maintaining a productive and comfortable commercial environment. At Dumars HVAC Services, we specialize in designing and installing customized heating, cooling, and ventilation systems tailored to your building’s size, layout, and operational needs.
Scheduled Maintenance Plans
Regular maintenance is essential to keeping your commercial HVAC system running efficiently and avoiding costly repairs or downtime. Dumars HVAC Services offers customizable scheduled maintenance plans designed to extend equipment life, improve energy performance, and ensure consistent indoor comfort.
Why Choose Us?
At Dumars HVAC Services, we combine professional expertise with a customer-first approach to deliver HVAC solutions you can depend on. With over 8 years of hands-on experience, we are fully licensed in refrigeration and air conditioning and EPA 608 certified for safe refrigerant handling. We offer fast, friendly, and affordable service—available 24/7 for emergencies—and we treat your home or business with the same care we’d give our own.
Testimonials
“We needed a full HVAC replacement for our office, and Dumars HVAC handled it flawlessly. From consultation to installation, they were professional, efficient, and respectful of our workspace. Highly recommend them for any commercial HVAC needs!”
Sarah M.
“Our heat went out in the middle of the night, and I was panicking with a baby in the house. Dumars HVAC picked up immediately and arrived in under an hour. They fixed the issue quickly and didn’t overcharge. Their 24/7 service is no joke!”
James R.
“We had a new furnace and smart thermostat installed, and the whole process was smooth. The team was on time, neat, and explained how to use everything. Our home feels so much more comfortable, and our energy bills are already lower!”
Linda T.
“I’ve worked with a few HVAC companies in the past, but Dumars is by far the best. Their communication was excellent, prices were fair, and the quality of work exceeded expectations. I’ve already recommended them to my neighbors!”
Carlos D.
“They handled our seasonal maintenance and caught a problem before it turned into an emergency. I appreciate how thorough and honest they were. It’s hard to find dependable service these days, but Dumars HVAC definitely delivers.”
Monica S.
“I can’t say enough good things about Dumars HVAC Services. When our A/C stopped working on one of the hottest days of summer, they answered our call immediately and had a technician out within a few hours. The team was friendly, professional.!”
Nathan B.