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The most proven method for sizing HVAC equipment is ACCA (Air Conditioning Contractors of America) Manual J load calculation. ACCA publication "Manual J The boiler sizes have varied in each estimate. ALL of them have used house square footage and baseboard lengths to do the sizing, NONE have done a Manual J You'll know exactly what size AC, furnace, and/or heat pump is right for your home. We find that people are often surprised that the Manual J suggests they