Duct Insulation Calculator
Insulation R-value and material for HVAC ductwork.
Inputs
in
ft
°F
°F
Results
Heat loss (insulated)
1,676 BTU/hr
Est. annual savings vs bare
$179
Duct surface area157.1 sq ft
Heat loss (bare)8,378 BTU/hr
Heat loss reduction80%
Temp drop per 100 ft5.6 °F
Insulation material needed173 sq ft
How to Use This Calculator
- Enter Duct diameter (or width), Total duct length, and Duct shape.
- Set Round, Rectangular, and Supply air temperature.
- Adjust Ambient temperature, Insulation R-value as needed.
- Review Heat loss (insulated) (BTU/hr) and Est. annual savings vs bare ($).
- Use Duct surface area (sq ft) and Heat loss (bare) (BTU/hr) to inform your decision.
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