Manual J Articles & Information

ACCA Manual J Residential Design Center
Air Conditioning Contractors of America's own knowledge base on the Manual J sizing method.

Bigger Is Not Better
Good article on sizing air conditioners properly.

Efficient Cooling: Making It Happen
Older article from Home Energy Magazine on the importance of proper sizing.

EERE Consumer's Guide: Sizing Heating and Cooling Systems
U.S. Department of Energy article on heat loss and heat gain.

How to Size HVAC Systems Correctly
It is common for mechanical systems to be oversized, which increases installation costs, wastes energy, and reduces comfort and moisture control. Properly sized equipment will last longer, provide greater comfort, reduce noise, and save homeowners money.

Manual J training
Take a two-day course on manual J from Wrightsoft corporation. They travel around, so check to see if they will be offering manual J load courses in your area.

EERE Consumer's Guide: Sizing Heating and Cooling Systems - thanks nitin
"Older space conditioning systems (more than 10 years old) are often unreliable and much less efficient than a modern system. When it's time for a new replacement, choosing one of the correct size (heating and/or cooling output) is critical to getting the best efficiency, comfort, and lowest maintenance and operating costs over the life of the new system..." [read more]

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