What is Manual J in HVAC?

Manual J is the protocol used for determining the amount of heating and cooling that a home requires to keep its occupants warm in the heating months and cool and dry in the cooling months. Your HVAC tech should use the latest software to aid in a Manual J calculation.

How long does Manual J take?

The software uses a home’s property tax records and location to automatically select the building materials required to meet local building codes during construction. By combining the dimensional data with the material selection, a contractor can perform an ACCA-approved manual J in less than one minute.

What is ACCA Manual J?

As the largest HVACR contractor organization, ACCA is committed to helping its members succeed. Manual J allows contractors to perform a load calculation on a residential building/home. Apart from the load calcu- lation being performed, the ducts must be sized and the correct size equipment must be selected.

What is manual D calculation?

Manual D is the industry standard for sizing home HVAC return and supply duct & registers. Manual D duct design distributes the correct amount of heating and cooling to each room based on the Manual J load calculation results.

Who provides Manual J?

Air Conditioning Contractors of America (ACCA)
The Air Conditioning Contractors of America (ACCA) publishes and updates Manual J and Manual D. These two technical procedure manuals cover residential load calculations, and ductwork design and sizing, both of which are vitally important components of successful air conditioner installation and operation.

Is a Manual J required?

Before having a new heating and cooling system installed, you need a Manual J load calculation performed. Upgrading an HVAC system is a big deal so maximize your investment value by getting an accurate Manual J heat gain and heat loss calculation.