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Video · Furnaces and Heating

Furnace Replacement Before and After: Why the Plenum Matters

The best part of a furnace replacement after shot is often the sheet metal on top. A new plenum built to fit the new furnace keeps air going to your rooms instead of leaking into the basement.

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What you’re seeing in this video

The joke opens on a stranger walking down a city street, with the meme line asking what bro is filming. The answer is a fresh furnace install, which is exactly the kind of thing an HVAC tech stops to film.

The payoff is a new Rheem furnace installed in a basement, topped with a new supply plenum, the sheet metal box on top of the furnace that feeds the main ducts, fitted square to the cabinet.

Job footageSwiftPro
Topic
Furnaces and Heating
Length
0:15
Posted
October 4, 2026
Shot by
The SwiftPro crew, Northern Virginia

Why it matters in your house

  • New furnaces rarely have the same footprint as the ones they replace. A plenum rebuilt to fit avoids gaps, crushed transitions and the whistling that comes from forcing old metal onto a new cabinet.
  • In your own after photo, look for seams sealed with mastic or foil tape, a level furnace, a filter slot you can reach easily, and ductwork that doesn't sag.
  • Leaky plenums waste heat you paid for. If your basement is oddly warm while upstairs rooms stay cool, the connection at the top of the furnace is worth a look.

Should the plenum be replaced with a new furnace?

Often, yes. The plenum has to match the new furnace's top opening and the AC coil above it. If the old one is rusted, leaky or the wrong size, building a new one is the cleaner fix. A good contractor tells you up front whether they plan to reuse it or replace it, and why.

Want it done at your place? See Furnaces and Heating at SwiftPro or call (703) 997-9757.

More videos from the SwiftPro crew

Two techs work on a furnace in a basement, then close-ups of the open furnace showing the burners and flame sensor, and the flue and duct connections above.0:34Furnace Flame Sensor: The Small Rod That Can Shut Off Your HeatA furnace in a basement with the front panels off showing the burners, gas valve, control board and blower.0:35Furnace Flame Color: What a Blue vs Yellow Flame Tells a TechOld furnace with the panels off showing burners and wiring, then a new Rheem furnace (Rheem logo legible) installed in a basement with new plenum.0:07Old Furnace Replacement: The Vision Is to Fill the Room RightTyler Griffin in a grey SwiftPro hoodie and khakis with a lineup of six crew members in front of a wrapped SwiftPro van, a big '$67' price on screen and phone 571-470-0995.0:23Furnace Inspection Before Winter: Tyler and the Crew Bring It BackBasement furnace replacement: two techs pull the old furnace out, captions explain poor airflow and aging furnace, then a new Rheem furnace (Rheem logo legible) installed on a tile floor; phone 571-470:34Dirty Furnace Filter or Tired Furnace? Why Heating Bills ClimbAn open gas furnace in a basement mechanical room with on-screen labels for the heat exchanger and blower motor.0:21Parts of a Furnace: What's Inside and the Job Each Part Does

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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