Call (703) 430-7100 today to schedule a building assessment.
Arminco Air replaces and services commercial rooftop units across Washington DC, Maryland and Northern Virginia, and has done commercial and industrial mechanical work in the region for more than 17 years. A rooftop replacement is a logistics job as much as a mechanical one, and most of what goes wrong on them is scheduling, access and paperwork rather than equipment.
Six stages, and the equipment swap itself is usually the shortest of them. Survey and sizing comes first: existing tonnage, curb dimensions, electrical service, gas line, and whether the current unit was correctly sized in the first place. Replacing like for like repeats an original mistake surprisingly often.
A new unit rarely matches the old curb footprint, so an adapter curb is designed and fabricated before the lift rather than on the day. Crane planning covers setup location, swing radius, any street or lot closure, and the permit required for a lift over a public right of way.
Certificates of insurance are issued to property management before mobilisation, with the limits and additional insured wording your building requires. We coordinate COIs as part of the job rather than as an afterthought once the crane is booked.
We schedule around tenant hours and agree the disruptive stages with property management before the crane is booked. The lift itself is usually a matter of hours. The part that affects tenants is the loss of conditioned air to the zone that unit serves, so that window gets planned against occupancy rather than against our own schedule.
Replacements can run evenings and weekends where the building requires it. Emergency rooftop repair is available 24 hours a day, seven days a week, and the office is open Monday to Friday, 8:00am to 4:00pm for scheduling and estimates.
Replacement generally wins when two or more of these are true. A single one usually points to a repair.
An honest answer here matters more than a quick sale. If the unit has years left, we say so, and a repair that buys three more seasons is often the better call on a building with capital planned elsewhere.
Full replacement and ongoing service for packaged rooftop equipment across every commercial building type we work on.
Round-the-clock response when a rooftop unit fails outside business hours or in peak season.
Tonnage, curb dimensions, electrical service and gas line checked against the load the building actually carries today.
Setup location, swing radius, access planning and the permits a lift over a public right of way requires.
Charge verification, airflow balancing, sequence testing and tie-in to the building control system.
Every replacement is commissioned to manufacturer specification and documented, so the warranty holds and the next contractor to touch the unit knows what was done.
Many rooftop units are replaced like for like because it is the fastest quote to produce. If the original was oversized, the new one short cycles, wears its compressor early and never dehumidifies properly. If it was undersized, it runs continuously and still loses the space on design days. A replacement is the only realistic chance to correct that, so we calculate the load rather than reading the old data plate.
Getting these right is the difference between a unit that lasts its full service life and one that comes back as a warranty call in year three.
Businesses across Washington DC, Maryland and Northern Virginia use AAI because we work only on commercial buildings. There is no residential division, so a rooftop unit down at your building is never queued behind summer service calls on houses.
One contractor covers DC, Maryland and Northern Virginia, so a portfolio spanning jurisdictions does not need three vendors and three sets of paperwork.
Not every rooftop problem needs a new unit. We diagnose the failure before quoting the fix, because a control board, a contactor or a failed economiser actuator is a very different conversation from a compressor.
We work to what the building can carry this year, and we will tell you when deferring a replacement is the better financial call.
Rooftop unit replacement and service across Washington DC, Montgomery and Prince George’s counties in Maryland, and Northern Virginia including Arlington, Alexandria, Fairfax County and Loudoun County. Our shop is in Sterling, Virginia.
Call (703) 430-7100 or contact us online. Send the unit tags if you have them and we will tell you whether you are looking at a repair or a replacement.
Yes. Crane coordination, setup location, swing radius and any permit required for a lift over a public right of way are arranged as part of the job.
Yes. COIs carrying the limits and additional insured wording the building requires are issued to management before work starts.
The lift and changeout is typically completed in a day per unit. Survey, curb adapter fabrication, crane scheduling and permits are what set the overall timeline. From the site survey to the crane lift is typically three to seven business days, depending on unit availability, permit review in that jurisdiction, and crane and roof access scheduling.
Yes. Replacements are scheduled around tenant occupancy, including evenings and weekends where the building requires it.
Yes, and it is one of the more common reasons a replacement makes financial sense. R-22 has been phased out, so recharging an older unit gets more expensive and less certain every year.
Rarely without an adapter. A new unit almost never matches the old curb footprint, so we design and fabricate an adapter curb before the lift rather than improvising on the roof.
Yes. Rooftop units are covered under planned maintenance agreements and under 24/7 emergency repair. Customers on a maintenance agreement have a four-hour on-site response commitment; without an agreement, emergency dispatch is available around the clock but without a guaranteed arrival window.
Washington DC, Montgomery and Prince George’s counties in Maryland, and Northern Virginia including Arlington, Alexandria, Fairfax County and Loudoun County.
We do. Arminco Air pulls the mechanical permit and schedules the inspection, so the building owner is not managing the permit process alongside the work. Permit timelines vary by jurisdiction, and we account for the local authority’s review time when we build the project schedule.
Yes. Arminco Air holds Virginia Class A contractor license number 2705183187. Class A is the highest of Virginia’s three contractor classifications. You can verify it through the Virginia Department of Professional and Occupational Regulation license lookup. We are fully insured, and certificates of insurance are issued before work begins.
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