Tag Archives: Acca

HAVC Systems – Bigger Isn’t Always Necessarily Better

Two problems we commonly see with HVAC installations are improperly sealed ductwork and improperly sized systems. Generally, systems tend to be oversized which lead to short runtimes. When performing retrofits, customers should be sure that their HVAC service providers are using the Air Conditioning Contractors of America (ACCA) Manual J and Manual S. Replacing a system based on the existing unit’s name plate is not good enough. Using a “rule of thumb” based on a home’s square footage is not good enough either. These methods might provide a good starting point or first estimate, but they’re not good enough to properly size your system. Continue reading

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HVAC Design Calculations – For the Homeowner, Builder, Architect, and the Handy Do-It-Yourselfer

HVAC design calculations, Manual J heat loss/gain calculation, Manual D duct designs, and Manual S equipment selection, are the ACCA approved methods for properly designing heating and/or air conditioning and ventilation systems (HVAC). These methods are rapidly sweeping across our country as the preferred methods to determine HVAC equipment and duct system sizing, as well as other comfort systems, such as radiant floor heating. Continue reading

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