The Hidden Energy Waste: Why Duct Sealing Matters
Leaky ductwork wastes 20-30% of your HVAC energy. Learn how duct sealing works, what it costs, and how quickly it pays for itself.
If your ducts run through an unconditioned attic or crawl space -- as they do in most East Bay homes -- sealing leaks is one of the most cost-effective energy improvements available.
The Problem
The Department of Energy estimates that typical duct systems lose 20-30% of conditioned air through leaks, gaps, and poor connections. In a home spending $200/month on heating and cooling, that is $40-60 per month wasted on conditioning air that never reaches your rooms.
Where Ducts Leak
The most common leak locations are where branch ducts connect to the main trunk, where flex duct attaches to metal fittings, at the air handler boot connections, and where duct runs pass through walls or floors. These joints and connections were often sealed with duct tape during original construction -- and duct tape fails within a few years.
Professional Duct Sealing
Professional duct sealing uses mastic sealant and metal-backed tape that lasts the life of the ductwork. We seal all accessible joints, reconnect any separated duct runs, and insulate ducts in unconditioned spaces. Before and after testing quantifies the improvement.
Cost and ROI
Professional duct sealing typically costs $1,000-2,500 depending on the size of the system and accessibility. With 15-25% energy savings on a $2,400 annual HVAC bill, the payback is 1-3 years. After that, the savings continue indefinitely.
PCG Climate offers duct testing and sealing throughout the East Bay. Call us to find out how much energy your ducts are wasting.
Need Help?
PCG Climate provides professional HVAC, electrical, water heater, and appliance repair services across Pleasanton and the East Bay.