HVAC Calculators

Heating, ventilation, and air conditioning systems must be properly sized to work efficiently. Oversized systems short-cycle, wasting energy and failing to dehumidify. Undersized systems run constantly without reaching setpoint temperatures. These calculators help determine appropriate equipment and ductwork sizes for comfortable, efficient operation.

Cooling capacity is measured in BTUs per hour or tons (12,000 BTU = 1 ton). The required capacity depends on square footage, climate, insulation quality, window area, and other heat gain factors. Simple rules of thumb like "400 square feet per ton" often lead to oversizing; our calculators use more factors for accurate results.

Airflow through ductwork is measured in cubic feet per minute (CFM). Each room needs a specific CFM based on its heating/cooling load, and ducts must be sized to deliver that airflow without excessive noise or pressure drop. The Duct Size Calculator and CFM Calculator work together to design balanced duct systems.

Efficiency ratings like SEER (cooling) and AFUE (heating) help compare operating costs between equipment options. Higher efficiency costs more upfront but saves money over the equipment's lifetime, especially in extreme climates.