A 2000 Square Foot Home Needs 3.5 to 4 Tons for Ideal Operating Costs
https://precisiontrainedhvac.wpsuo.com/regular-tune-ups-extend-your-system-s-useful-life-to-15-plus-years-reliably
For a 2000 square foot house in Sacramento, you typically need a 3.5 to 4 ton HVAC system to balance comfort with operating efficiency