February 3, 2012 Cool Smart Program Changes for 2012

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Proper Unit Sizing

Beginning January 1, 2012, all Cool Smart rebate applications for Central AC and heat pumps must be accompanied by a Manual J Load Calculation, documenting that the unit was properly sized for the home and its occupants. The use of Manual J load calculations is a requirement of the building code in both MA and RI. To ensure that the customer qualifies for a Cool Smart rebate, the contractor must:

• use only an ACCA-approved software package, for Manual J Version 8
• use the nearest weather city data for proper design temperatures (DT)
• comply with ACCA Manual S sizing at the proper Sensible Heat Ratio (SHR) for our region
• submit the Manual J Project Summary page showing proper DT and SHR, and Project Information including number of occupants
• size the installed AC equipment to within the nearest half ton of the Manual J load at proper DT and SHR, or the Manual S recommended size.

TJ’s Standard Practice

TJ’s is proud to have been using Manual J heat load calculations right along to properly size all of our systems, for heating and cooling.  Our customers have never had to worry about whether their system was over-sized or under-sized.  We never did this just to comply with rebate requirements.  We did it because it is the right thing to do to ensure every customer’s comfort with an appropriately sized system.

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