HVAC Sizing Calculator
Size heating and cooling systems for rooms
sq ft
ft
Formula
BTU = Area × 25 × Ceiling Factor × Climate Factor
25 BTU per sq ft base, adjusted for conditions.
Examples
1500 sq ft, moderate
~37,500 BTU = 3.1 tons.
Frequently Asked Questions
About HVAC Sizing
Size HVAC systems for heating and cooling rooms.