Day & Nite Commercial HVAC Services — Keeping the Capital Region Cool, Comfortable, and Operational

In the Washington D.C. area, there’s no room for HVAC failure. Government buildings, restaurants, hospitals, embassies, hotels, universities — they all run on precise, uninterrupted climate control. At Day & Nite, we specialize in commercial HVAC systems designed to keep D.C. businesses running efficiently, quietly, and reliably, no matter how hot, humid, or high-pressure the day gets.

From the heart of the District to Northern Virginia and suburban Maryland, we install, service, and maintain HVAC systems that are built for performance and backed by nearly 50 years of technical experience and real-world urgency.

HVAC Systems Designed for D.C.’s Diverse Demands

Every building in D.C. tells a different story — historic brownstones, modern glass towers, below-ground kitchens, federal campuses. That’s why our commercial HVAC systems are never one-size-fits-all. We customize every project to meet your space, your usage, and your compliance needs. Rooftop units, VRF systems, make-up air, kitchen exhaust integration, air quality systems, humidity control — we build solutions that match your reality.

Whether you’re outfitting a Capitol Hill restaurant, a downtown high-rise, or a K-12 facility in Prince George’s County, we tailor your HVAC to function with precision, efficiency, and year-round consistency.

Clean, Fast Installations — Without the Guesswork or Delays

Opening a new café in Navy Yard? Retrofitting an outdated unit in Arlington? Replacing rooftop equipment at a hospital in Bethesda? We’ve done it — and we’ve done it on deadline, with zero margin for error. Our install teams handle everything: planning, permits, ductwork, electrical tie-ins, and control systems. We coordinate with your GCs and project managers, and we keep your schedule on track. No finger-pointing. No cut corners. Just a professional install that works.

Emergency Repairs — 24/7 Coverage Across the Capital Region

HVAC emergencies in D.C. are more than an inconvenience — they’re a liability. And they tend to hit right before an event, a service, or a critical inspection. That’s why our emergency HVAC teams are on call 24/7 across Washington D.C., Northern Virginia, and Maryland. From failed rooftop units to blown motors, frozen coils, or control system issues, we move fast, fix right, and get you back online before the heat (or the pressure) rises.

Preventative Maintenance That Keeps You Ahead of the Curve

The D.C. climate is brutal on commercial systems — high humidity, fluctuating temperatures, pollen, salt air, and energy spikes. Our preventative maintenance programs are designed to keep your HVAC running smoothly under all that pressure. We check filters, test airflow, clean coils, monitor performance metrics, tighten belts, inspect motors — everything it takes to keep your system humming through peak seasons and power surges.

We track performance over time so you can spot aging equipment before it becomes an emergency — and plan your upgrades on your schedule, not in a panic.

Supporting the Capital’s Most Demanding Commercial Environments

We’ve worked in just about every type of facility across the region:

• Government buildings and federal contractors

• Embassy and diplomatic offices

• Hotels, conference centers, and high-end restaurants

• Hospitals, outpatient centers, and senior living

• Universities, K-12 schools, and childcare centers

• Corporate campuses and commercial offices

• Retail centers and mixed-use properties

• Historic buildings with complex retrofit needs

We serve all across D.C., Arlington, Alexandria, Silver Spring, Rockville, Fairfax, Bethesda, Tysons, and beyond. Wherever your facility is — we’re not far.

Engineered for D.C. Precision. Backed by National Strength. Always On Call.

This region doesn’t run on “good enough.” From regulatory expectations to tenant comfort to system longevity, HVAC here has to be rock solid. And so do the people who service it. At Day & Nite, we don’t just fix systems — we solve problems, prevent disasters, and give building managers peace of mind.

Replacing aging infrastructure in Dupont Circle? Installing new systems in Montgomery County schools? Want a preventative maintenance program that won’t leave you scrambling in July?

We’ll design it for your footprint.
We’ll install it with zero drama.
We’ll fix it any time of day.
We’ll maintain it like failure isn’t an option — because in D.C., it isn’t.

That’s Day & Nite Commercial HVAC — trusted across the capital to keep the air moving, the systems running, and the work going.