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Video · AC Replacement

How Is an AC Unit Replaced on a Commercial Roof?

How is an AC unit replaced on a commercial roof? In a set order: gas and power off, refrigerant recovered, old unit lifted off its curb, new one set and reconnected. This clip shows it through the tech's own eyes.

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What you’re seeing in this video

The camera rides with the tech, so all you see are hands, arms and boots. On a roof still wet from rain, a hand turns the gas valve at the rooftop package unit, an adjustable wrench lying close by.

A tool bag and coiled hoses sit on a walkway pad, the protective strip that keeps foot traffic from wearing through the roof membrane. Then the new rooftop unit stands on its curb with its service panels open under a blue sky, waiting on its connections.

Job footageSwiftPro
Topic
AC Replacement
Length
1:09
Posted
August 16, 2026
Shot by
The SwiftPro crew, Northern Virginia

Why it matters in your house

  • A package unit with a gas valve heats as well as cools, so the swap includes a gas leak check and a burner test, not just the cooling side.
  • Curbs don't always match. If the new unit has a different footprint, an adapter curb goes in so the duct openings line up and the roof stays sealed.
  • Walkway pads matter on any roof with equipment. If yours is missing them, foot traffic to the unit will eventually wear a leak into the membrane.

How is an AC unit replaced on a flat roof?

Power and gas get shut off, the refrigerant is recovered, and the old unit is disconnected and craned off its curb. The curb gets inspected or adapted, the new unit is set, and power, gas, drain and controls are reconnected. Startup checks gas pressure, heat, cooling and airflow before anyone climbs down.

Want it done at your place? See AC Replacement at SwiftPro or call (703) 997-9757.

More videos from the SwiftPro crew

A person bundled in a blanket on a couch under a ceiling air vent, with the caption the AC isn't broken, you're just cold.0:09AC Can't Keep Up, or Is It Just You? A Quick Way to TellAC replacement: a tech wheels a new condenser on a hand truck across a wet deck, another tech reads digital manifold gauges on the old condenser by a brick wall, and the new condenser sits finished on0:34AC Replacement Before and After, With the Gauges OnDark attic footage: a tech in a black hoodie crawls past foil-wrapped insulated ductwork under the rafters, then works at an attic air handler.0:21Signs You Need a New HVAC System, and Who Crawls Up to CheckNight air handler replacement in a cramped attic or closet: a gloved hand on old foil-wrapped ductwork, three techs in black hoodies lowering the new air handler into place, then the finished unit wit0:40Air Handler Replacement After Dark: Three Techs, a Tight FitA crane lifts a new rooftop AC package unit against blue sky over a brick commercial building.0:14Crane Lifting an AC Unit Onto the Roof: Be the CraneA 30-year-old Air Temp Premiere AC condenser, still running, sits on red lava rock beside a house's siding and wooden deck.0:13A 30-Year-Old Air Temp AC Unit That's Still Running

See all 234 SwiftPro videos

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SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
Virginia Class A contractor license #2705192276

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