A 2000 Square Foot Home Needs 3.5 to 4 Tons for Ideal Operating Costs
https://precision-anytime-hvac.cavandoragh.org/undersized-and-oversized-ac-units-fail-faster-than-properly-calculated-tonnage-systems-2
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