Correctly Sizing an HVAC Unit Determines Whether Replacement Becomes Inevitable

https://blogfreely.net/lithilszxt/h1-b-thermostat-settings-at-78-80degf-during-work-hours-extend-system-lifespan

For a 2000 square foot house, you typically need a system between 3.5 and 5 tons of cooling capacity, depending on insulation, ductwork, and local climate