What is ACCA Manual J load calculation?

What is ACCA Manual J load calculation?

The Manual J residential calculation is actually the proper method for sizing an HVAC unit—a technique designed by the Air Conditioning Contractors of America (ACCA). An accurately sized HVAC unit will ensure that the desired space can reach the right temperature without wasting energy.

How much does a Manual J Cost?


Size of Residence Manual J Calculation Manual D Calculation
< 2000 sq.ft $250 $150
2000-3500 sq. ft. $350 $250
3500-5000 sq.ft. $450 $350
5000-6500 sq. ft. $550 $450

Do I really need a Manual J load calculation?

Homeowners should insist that a proper Manual J load calculation be performed before signing a contract. According to ACCA (The Air Conditioning Contractors of America), Manual J is the recommended hvac load calculation method for use in the United States.

What is a 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.

How many CFM’s are in a ton?

400 cubic
First of all, you need to understand a couple concepts: 1 ton of cooling is equal to 400 cubic feet of air per minute. 2 ton of cooling is 800 cfm and so on. So a 4 ton unit will have 1600 cubic feet of air passing through the system every minute.

What is ACCA Manual S?

ACCA Manual S provides specific procedures for selecting HVAC equipment against a set of Manual J loads and design conditions. Manual S uses OEM data and specifies how large or small the selected HVAC equipment capacity can be when compared to the Manual J load calculation.

What does a Manual J consist of?

Manual J outlines the requirements for conducting a “load calculation” on the home, such as measuring insulation and ventilation levels. Other considerations include air duct tightness and the number of heat-producing appliances and people.

What does Manual J mean?

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.

What is Manual J and S?

Manual J: Load Calculation. Manual S: Equipment Selection. Manual D: Duct Design. Manual T: Air Distribution.