Incorrect tonnage selection voids manufacturer protection on 2000 square foot homes

https://precision-hvac-sacramento-crew-sac-near-sutter-park1477.evergrovio.com/posts/between-repair-costs-and-replacement-value-the-5-000-furnace-decision-point

For a 2000 square foot home in Sacramento, you typically need a 3.5 to 4 ton unit, but sizing incorrectly creates void risk that leaves you exposed to uncovered repair costs