General HVAC sizing guidelines recommend roughly one ton of cooling capacity for every 500 to 600 square feet of living space, meaning a 3.5-ton air conditioning unit is ideally sized to cool a standard home ranging from 1,800 to 2,200 square feet. However, proper equipment sizing depends heavily on localized climate severity, ceiling heights, window surface areas, attic insulation quality, and overall ductwork integrity. A professional Manual J load calculation is essential to confirm exact requirements.
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