Keep Your Customers Comfortable with Well-Ventilated Homes

socksIn today’s tight, energy-efficient homes, proper design of the HVAC system is critical to avoid issues of occupant comfort and callbacks.

To help members in understanding the criteria necessary for proper HVAC equipment design and mechanical duct sizing, NAHB’s Construction, Codes & Standards group recently invited Glenn Hourahan, Senior Vice President of the Air Conditioning Contractors of America (ACCA) to present What a Builder Needs to Know About HVAC System Design as part of NAHB’s Webinar Wednesday series.

Glenn walked attendees through the basic criteria of ACCA Manual J (Residential Load Calculation), Manual S (Residential Equipment Selection) and Manual D (Residential Duct Systems) that a builder needs to provide to his HVAC contractor for proper equipment and duct sizing. He also identified specific design parameters a builder can review to verify their mechanical contractor has provided a proper design.

Key tips included making sure the correct outdoor and indoor temperatures for the home’s location have been used, the standard number of occupants (equal to the number of bedrooms plus one occupant) assumed, and that building orientation and features such as the presence of eaves or skylights have been considered.

Building codes increasingly require mechanical ventilation across most climate zones. To help builders navigate these code requirements, NAHB contracted with Home Innovation Research Labs to develop a Tech Note on Whole House Mechanical Ventilation.

The Tech Note explains the advantages and disadvantages of exhaust-only, supply-only, and balanced ventilation, provides guidance for maximizing the performance of the ventilation system, and highlights the need to avoid back-drafting from fuel-burning appliances.

See the NAHB Tech Note page for more resources.


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