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Video · Furnaces and Heating

Old Furnace Replacement: The Vision Is to Fill the Room Right

The joke is that a furnace room has one design goal: fill it. The real goal is a new furnace sized to your house by a load calculation, not copied off the old furnace's label.

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What you’re seeing in this video

Someone asks the classic design-show question, what's your vision for this room, and the answer comes back flat: to fill it. That's the whole gag, and anybody who has squeezed into a furnace closet gets it.

First you see the old furnace with its front panels off, burners and wiring exposed. Then the new Rheem furnace stands in the same basement spot with fresh sheet metal for the plenum above it, tying it into the house's ductwork.

Job footageSwiftPro
Topic
Furnaces and Heating
Length
0:07
Posted
October 13, 2026
Shot by
The SwiftPro crew, Northern Virginia

Why it matters in your house

  • Plenty of older furnaces were oversized. A furnace that's too big heats in short blasts, cycles more and leaves rooms uneven. A load calculation sizes the new one to your square footage, windows and insulation.
  • Matching the old nameplate copies any old mistake. Ask how your contractor sized the new furnace and whether they checked that your ductwork can move the air it needs.
  • New sheet metal at the plenum is a good sign. A rusted or poorly fitted plenum leaks air into the basement instead of sending it to your rooms.

Should a new furnace be the same size as my old one?

Not automatically. The old one might have been too big from day one, or your house may have changed with new windows, insulation or a finished basement. Proper sizing uses a load calculation, often called a Manual J, to figure what your home loses on a cold night. Then the furnace gets chosen to match that number.

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

More videos from the SwiftPro crew

Basement 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 ClimbA 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 TechTwo 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 HeatOpens on a meme clip of a stranger in a maroon hoodie walking down a city street ('what is bro filming'), then a new Rheem furnace (Rheem logo legible) installed in a basement with new plenum.0:15Furnace Replacement Before and After: Why the Plenum MattersTyler 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 BackAn 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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