Manual J was designed by ACCA (Air Conditioning Contractors of America) to properly be able to take in all parts of a house and determining its heating and cooling loads. These two values, combined with multiple other factors taken into account, will help figure out the specific tonnage size your unit needs to accomodate your home.

Using any non-official method for calculating the tonnage will often lead to inaccurate and incomplete results. Units too large will likely short cycle, which can cause it to underperform and eventually cause expensive damages. Units too small will struggle to perform even in normal conditions

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