Why does my new AC need a duct test?

California's energy code often requires it when equipment is replaced, to make sure ducts don't waste energy.

Can ducts be sealed without replacing them?

Often, yes, if they're in reasonable shape.

Duct Testing & Sealing in Modesto, CA

Signs of leaky ducts

Rooms that never cool, weak airflow from some vents, dust, high bills and an upstairs that's much hotter than downstairs.

Testing

A duct leakage test pressurises the system and measures how much air escapes. California's Title 24 often requires this test when an AC or furnace is replaced.

Sealing

Joints and seams are sealed with mastic or approved tape. Crushed, torn or disconnected sections are repaired or replaced.

Insulation

Attic ducts need insulation in good condition. Damaged insulation lets hot attic air warm the cooled air before it reaches the room.

Return air

Too few returns starve the system of air. Adding returns can quiet the system and improve comfort.

Smoke and dust

Leaky return ducts pull dusty or smoky attic air into the home. Sealing helps keep indoor air cleaner.

With a new system

Testing and sealing ducts when you replace equipment ensures the new system performs as rated. See AC installation.

Get it tested

Tell the technician which rooms are uncomfortable. Send a request and an HVAC technician will get in touch.

Before and after

Ask for the test numbers before and after sealing, so you can see how much leakage was fixed.

Attic temperatures

On a hot afternoon, attic temperatures in the valley can climb far above outdoor air temperature. Every leak in that space costs cooling, which is why sealing often brings a noticeable drop in bills.

Crawl spaces

Some homes run ducts under the floor. Crawl-space ducts can be crushed, disconnected or chewed by animals, so they deserve a look too.