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HVAC duct evaluation before equipment replacement checklist

A pre-installation duct checklist for accessible condition, leakage, sizing, static-pressure risk, return paths, room airflow, insulation, supports, contamination, filter arrangement, abandoned ducts, and repair scope before new HVAC equipment is connected to an unsuitable distribution system.

6 items to check

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Accessible ducts, plenums, boots, joints, supports, and insulation are surveyed

Critical item

The retained system should be physically sound and serviceable.

Duct leakage is tested or otherwise evaluated with a written correction plan

Critical item

Leakage assessment should follow the project program, code, or accepted test method.

Supply and return capacity can support the selected equipment airflow

Critical item

Duct and filter resistance should remain within equipment performance limits.

Each room has a credible supply and return-air path

Critical item

Distribution should support room loads and door-closed operation.

Contamination, combustion, moisture, and pressure interactions are addressed

Critical item

Duct work should not spread pollutants or create unsafe pressure effects.

Repairs, replacements, balancing, and post-work testing are included in writing

The owner should know what remains and how results will be verified.

Use before equipment order or installation when existing ducts will remain. ENERGY STAR advises evaluating ducts because leakage and poor airflow can waste energy, reduce comfort, and shorten equipment life. Do not open energized equipment, handle refrigerant, defeat safety controls, or enter unsafe attics or crawlspaces. Require licensed or qualified HVAC and electrical work where applicable.

Reference standards

  • Approved HVAC design, adopted state and local mechanical and electrical code, permit and inspection conditions, utility or rebate requirements, signed scope, and exact equipment, refrigerant, duct, condensate, control, and accessory manufacturer instructions
  • Approved airflow design, accepted duct design and test methods, and equipment external-static-pressure limits

    • Tools

  • Written proposals, load calculation, equipment selections, duct and control plans, permit, and approved changes
  • Equipment data, commissioning forms, airflow and static-pressure records, refrigerant records, and electrical test documentation
  • Camera, thermometer, owner-safe observations, and qualified trade instruments used by competent personnel

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