How Duct System Design Affects Cooling Efficiency

April 19, 2015

In our Houston area’s warm and humid climate, the A/C system is an important appliance in homes. Unfortunately, high cooling bills are common side effects, too. If you would like to chip away at your cooling bill, take a moment to learn how duct system design affects cooling efficiency and your pocketbook.

Duct System Design

Like the pipes in your home that transport water for cooking and bathing, the duct system conveys conditioned airflow to keep you comfortable through the long cooling months. It’s important to know good duct design principles if you’re upgrading the air conditioner, building a new home or simply want better comfort and lower bills.

Duct layout – The layout of the ducts should be confined to the insulated conditioned areas of the home. When ducts are installed in crawl space and attics, they’re exposed to temperature extremes that rob you of cooled airflow. Sealed chases and hang ceilings are good places to conceal ducts within the conditioned spaces.
Types of ductwork materials – Standard ducts are made of thin sheet metal. They may be fabricated into round or square ducts. Any metal ducts located outside the insulation barrier should be insulated to help prevent heat gain and lost energy dollars.
Duct dampers – If you’re having difficulty keeping even cooling in your home, ask your HVAC tech to install manual duct dampers. Duct dampers may be adjusted to restrict or permit airflow to your liking.
Balanced air pressure – You may not think of air pressure as being relevant in your home. However, balanced air pressure is important for comfort, energy efficiency and good indoor air quality. Make sure you have equal return grilles to supply outlets for balanced airflow.
Sealing and testing – Metal ducts should be sealed with mastic paste and foil-backed tape. The seals should be tested to ensure air tightness. Your HVAC tech uses a blower door test to make sure the ducts are efficient and leak-free.

Learn more about duct system design and Davis Air Conditioning & Heating’s ductwork solutions, give us a call. Reach our Stafford area office at 888-710-5530, and our Angleton office at 888-929-0049.

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