How Can I Seal a Leaking Air Duct to Improve HVAC Efficiency?

You can seal minor duct leaks with HVAC mastic or foil HVAC tape, but larger issues should be inspected by a pro. Summers Plumbing Heating & Cooling provides duct inspection and cleaning, and our licensed technicians check for leaks or damage during service. Pairing cleaning with air treatment can extend HVAC life and reduce allergens.

Quick steps:

• Turn off HVAC.
• Clean and dry the area.
• Brush on mastic at seams and joints; use foil tape on small gaps.
• Replace the air filter after work.

Updated: 2025-12-24

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