Sources

Can the ductwork be modified to carry more air?

• Consortium for Energy Efficiency, Duct Retrofit Decision Guide (2024): acceptable, modify, replace
  https://cee1.org/images/pdf/CEE_Duct_Retrofit_Decision_Guide_TRC_01.16.24.pdf
• Fine Homebuilding, Furnace to Heat Pump Retrofit: return-side gains
  https://www.finehomebuilding.com/2024/03/06/furnace-to-heat-pump-retrofit
• Energy Vanguard, Will a Heat Pump Work With Your Existing Ducts?
  https://www.energyvanguard.com/blog/will-a-heat-pump-work-with-your-existing-ducts/
• Energy Vanguard, The 2 Primary Causes of Reduced Air Flow in Ducts
  https://www.energyvanguard.com/blog/the-2-primary-causes-of-reduced-air-flow-in-ducts/

The Steamboat paragraph is stated as field experience; no external source.

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