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Ductwork & Airflow Guides
19 guidesYour ductwork decides where conditioned air actually goes. In many Austin homes the ducts run through a hot attic, so leaks, poor sizing and missing return paths show up as hot bedrooms, weak airflow, dust and higher bills.
Start with How Your Home's Duct System Works, then read Why Properly Sized Ductwork Matters and Why Rooms Get Hot When You Close the Door to connect duct design with the problems you notice day to day.
When ducts are damaged, leaky or badly sized, our duct replacement page explains what a full duct redesign involves.
Each guide is written for homeowners, so you can understand the problem before anyone opens up a ceiling or climbs into the attic.
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Ductwork & Air FlowWhy Is One Room Hotter Than the Rest of the House?One room runs hotter when it gains more heat than its air supply can carry away. Usual causes: afternoon sun on west or south…
Ductwork & Air FlowDoes Closing Vents in Unused Rooms Save Money?Usually not. With central air, closing vents in unused rooms doesn't make the blower move less air. It raises duct pressure and pushes more…
Ductwork & Air FlowHow Do You Increase Airflow to One Room?Start with free checks: the register fully open and unblocked, a clean filter, and a path for air back to the return (compare the…
Ductwork & Air FlowMoisture From Below: Slab and Pier-and-Beam Homes in Central TexasGround moisture reaches Austin homes two ways: as vapor moving up through concrete slabs, and as humid outdoor air flowing through vented crawlspaces under…
Ductwork & Air FlowWhy Your Vents and Ducts Sweat: Dew Point and Condensation ExplainedVents and ducts sweat when a cold surface meets air whose dew point is above that surface's temperature. AC supply air leaves the coil…
Ductwork & Air FlowWhy a Bigger AC Isn’t Better in Texas HeatAn oversized AC reaches the thermostat setting so fast that it shuts off before the coil pulls much moisture out. That short cycling leaves…
Ductwork & Air FlowWhy a Bigger Furnace Isn’t Better: The Case for Dual FuelMost Austin winter days need only a little heat, so an oversized gas furnace short cycles: it blasts hot air, shuts off and repeats,…
Ductwork & Air FlowWhy Rooms Get Hot When You Close the Door: Return Air and Pressure BalanceA bedroom gets hot with the door closed when it has a supply register but no return path. Air blown in can't get back…
Ductwork & Air FlowLeaky Ducts: How They Pull Attic Air and Dust Into Your HomeThe return side of your duct system runs under suction, so any leak in a return duct, filter grille or air handler cabinet in…
Ductwork & Air FlowHome Exhaust Fans and Vents: Their Role in Indoor Air QualityExhaust fans and vents remove moisture, odors and pollutants at the source, like shower steam and cooking smoke, and send them outdoors. Properly vented…
Ductwork & Air FlowSmart HVAC Design: Manual J, D & S ExplainedManual J, S and D are the ACCA standards for designing home HVAC. Manual J calculates your home's heating and cooling load, Manual S…
Ductwork & Air FlowWhy Mitsubishi Electric Leads in Mini-Split Design and EfficiencyMitsubishi Electric is one of the best-known names in ductless mini-splits, known for inverter technology, efficient equipment and many indoor unit styles. Gold Eagle…

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