
BTU
Room BTU Sizing Calculator (San Antonio)
Base rule assumes 8 ft.
+600 BTU per person after two.
Rule of thumb ≈ 20 BTU/ft², then adjust.
Suggested Capacity: BTU/h
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Whole-Home HVAC Capacity Calculator (San Antonio)
Use conditioned area.
Baseline ≈ 22–24 BTU/ft² in hot/humid SA.