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The people I actually call for a swap
A rooftop changeout is only as good as the curb adapter, the crane, and the supply house behind it. These are the suppliers, fabricators, and services I trust on commercial RTU work in the mid-Atlantic — plus the field gear worth keeping on the truck. Straight talk, clearly labeled: partner, sponsor, or affiliate.
Curbs & adapters
The single most common reason a swap goes sideways. Get the adapter right and the rest of the day goes smooth.
H&B Engineered Products
Engineered curb adapters and rooftop accessories. Local to the mid-Atlantic, they build the transition to match the old curb's internal duct openings — which is exactly the detail that bites you on a brand-to-brand swap.
Partner listing — contact them directly.
Maryland Curb & Fabrication
Maryland shop that designs and builds custom roof curbs, HVAC curb adapters, fan curbs, equipment stands, and isolation rails — plus all-around custom welding. Local fabrication means a fast turn on a one-off adapter when the opening doesn't match the catalog.
Partner listing — contact them directly.
Where the equipment comes from
The wholesale houses behind the units, parts, and accessories. They run contractor accounts and partner programs worth setting up if you buy regularly.
United Refrigeration (URI)
National HVACR distributor — replacement parts, equipment, and supplies, with branches you can actually walk into. Set up a contractor account for pricing and online ordering; ask your rep about their rewards and loyalty programs.
Partner listing — relationship via contractor account.
Ferguson / Ferguson HVAC
One of the largest distributors in the country for HVAC, plumbing, and facility supply. Their dealer/partner program rewards regular buyers with pricing tiers and growth incentives — worth a look if you're moving volume.
Partner listing — relationship via dealer/partner program.
R.E. Michel Company
Family-owned national HVACR wholesaler — equipment, parts, and supplies with hundreds of branches and a deep parts catalog. A reliable counter when you need an odd part the same day. Headquartered right here in Glen Burnie, MD.
Partner listing — relationship via contractor account.
Johnstone Supply
Co-op of HVACR distributors with strong local branches, a big parts catalog, and good tech support. Set up an account at your nearest store for counter pricing and online ordering.
Partner listing — relationship via local branch account.
Gemaire Distributors
Watsco-owned distributor with a strong equipment lineup and online ordering. Good for residential and light-commercial equipment and the parts to go with it. Set up a contractor account for pricing.
Partner listing — relationship via contractor account.
Baker Distributing
National HVACR and refrigeration distributor — equipment, parts, and refrigeration supply, which makes them a solid call when a job crosses over into refrigeration work. Contractor accounts and online ordering.
Partner listing — relationship via contractor account.
SupplyHouse.com
Online HVAC, plumbing, and hydronics supply with fast shipping and a deep catalog — handy when you'd rather order parts than make a counter run. Free account, free shipping over their threshold, and a solid filter/motor/control selection.
Listed for reference — no affiliate or commission relationship.
Hajoca
One of the largest privately held wholesale distributors in North America — plumbing, heating, and industrial supply through 400+ local branches that run on local inventory and relationships. Set up an account at your nearest Hajoca branch for counter pricing.
Listed for reference — relationship via local branch account, no affiliate commission.
Getting the unit up there
Often the biggest single line item and the biggest scheduling risk on a rooftop swap. Line up the crane early — during the survey, not the week of.
Bob's Crane Service
Crane and rigging out of Kennett Square, PA — open around the clock, which matters when a swap runs long or a unit has to come down off-hours. Good people to have on speed dial for a chester county / mid-Atlantic lift.
Partner listing — contact them directly.
Titan Crane, Inc.
Crane service out of the Baltimore area — handy for rooftop sets and removals on the Maryland side. Worth a call for a competitive lift quote when the job's closer to Baltimore than Chester County.
Partner listing — contact them directly.
Making the air actually land right
A new unit is only as good as the balance behind it. An independent, NEBB-certified TAB firm gets the airflow, water, and sound dialed in — and gives you documentation the engineer of record will accept.
Chesapeake Testing & Balancing
Independent NEBB-certified test, adjust, and balance — air, water, and sound systems across commercial, institutional, and industrial work. Maryland-based and used to mid-Atlantic jobs. Bring them in for the commissioning and balance report.
Partner listing — contact them directly.
Alpha TAB
Fully independent test, adjust, and balance contractor covering Maryland, DC, Virginia, and DelMarVa for 20+ years — from small tenant buildouts to labs and hospitals. Not tied to any install contractor, so the reports come back factual and unbiased.
Partner listing — contact them directly.
Specialty gear on the spec
Manufacturers worth knowing by name when a job calls for something beyond the box on the curb. You'll order through a distributor or rep, but it pays to spec the right brand up front.
Berner Air Curtains
Air curtains for entrances, drive-thrus, loading docks, and walk-ins — the brand to spec when a job needs to hold conditioned air at an open door. Manufacturer; you'll buy through a distributor or rep, but spec Berner up front.
Manufacturer listing — order via distributor or rep.
Ward-Boland Associates
Greater-Maryland HVAC manufacturers' rep — represents 20+ leading lines for thermal management, air movement, humidity, and hydronics, plus a parts warehouse and service support. The people to call to spec and source the right equipment for a commercial job.
Partner listing — contact them directly.
Filters and gear worth keeping on hand
The filters, air-quality gear, and field tools I'd actually buy again. These point to retailers with genuine affiliate programs — once the tracking links are live, I may earn a small commission at no extra cost to you, in line with the disclosure below.
Filterbuy
American-made HVAC filters in every size, with subscription auto-delivery so the filter change actually happens on schedule. The one filter source I point homeowners to — right size, right MERV, on time. Their program pays per sale or per new customer.
Affiliate placeholder — goes live once the Filterbuy tracking link is in.
Sylvane
Air purifiers, dehumidifiers, humidifiers, and indoor-air-quality gear — the stuff that comes up the minute a customer mentions allergies, humidity, or a musty basement. Pairs naturally with the air-quality guides. Program runs through CJ.
Affiliate placeholder — goes live once the Sylvane tracking link is in.
HVAC Tools & Meters
Clamp meters, manifold gauges, micron gauges, and the consumables you burn through on a changeout. These open an Amazon search for the right gear — buy through it and RTU Swap earns a small commission at no extra cost to you.
Affiliate link — RTU Swap may earn a commission.
Your company here
Sell something every RTU contractor needs? This spot is open for a sponsor or partner listing — clearly labeled, alongside suppliers I already trust.
Open sponsor spot.
Want to be listed here?
If you supply equipment, fabricate curbs, run cranes, or sell gear that commercial HVAC contractors rely on, let's talk. Listings are honest and clearly labeled — partner, sponsor, or affiliate — and only for outfits I'd actually recommend.