HVAC Design & Documentation

HVAC sizing calculations are now a CALGreen mandatory requirement in the state of California.  To show compliance we use the ACCA Manual J, D, & S method.  These are design rules set out by the Air Conditioning Contractors of America which we use to ensure that your HVAC equipment meets your homes heating and cooling loads precisely.  This means that your equipment will not waste unnecessary amounts of energy in its normal day to day operation, reducing both your carbon footprint and your bills. We use thermal modeling and duct sizing software called Right-suite Universal to perform your ACCA Manual J,D, & S calculations.  

Designing a System

  • When modeling the heating and cooling loads of a home we will need a full set of plans including structural, mechanical, and electrical. This enables us to determine the sizing requirements of the system, where ducting may or may not be used, and what  type of system works best for the space. 

  • If you have an HVAC contractor you plan to work with we would appreciate you supplying us with their contact information so that we can model the system using the equipment and specifications that they are familiar with.

  • From there we will construct a digital model of your home using our thermal analysis software. 

  • Once the model is built we will have an idea of how much cooling and heating your home requires.

  • We then size the HVAC equipment to fit your home and model any ducting that may be necessary to make the entire home comfortable. 

  • Once the system is designed we will perform a static pressure measurement to make sure that all of the components work well together. 

  • Finally, we create an HVAC sizing report which includes a home loads summary, a static pressure report, a manual S report, a plan check review summary, and a custom sized architectural drawing so that you may include the layout in your plans. 

  • From there we keep open lines of communication with your HVAC contractor so that we know that the system being installed is the same as the original design. 

HVAC design and sizing is specific to each home. Never believe a contractor who tells you, "all homes need X number of tons of cooling per square foot." Those are antiquated means of sizing home heating and cooling equipment. They don't take into consideration things like roof/wall insulation, high quality windows,  furnace efficiency, and more. HVAC should be custom designed to each home as each home is designed differently. Our methods are tried and true and guarantee optimal performance from your HVAC system.

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