HRV Sizing Calculator

Size heat recovery ventilators based on building volume, air change requirements, and climate conditions.

Building Volume

cu ft

Air Changes per Hour

ACH

ASHRAE 62.2: residential 0.35 ACH target; commercial per 62.1 Table 6.2.2.1; new tight homes 0.1–0.3 ACH natural

Occupants

Design Outdoor Temp

°F

Indoor Temperature

°F

Sensible Efficiency

Tab to move between fields

Required Ventilation

93 CFM

Recommended HRV Size

100 CFM

Heat Recovered4,536 BTU/hr

Est. Annual Savings$272.00

Defrost Cycles/Day2

How to Use This Calculator

Enter Building Volume, Air Changes per Hour, and Occupants.
Set Design Outdoor Temp, Indoor Temperature, and Sensible Efficiency.
Review Required Ventilation (CFM) and Recommended HRV Size (CFM).
Use Heat Recovered (BTU/hr) and Est. Annual Savings ($) to inform your decision.

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Related Calculators

Calculate required outdoor air ventilation rates per ASHRAE Standard 62.1 based on occupancy and space type.

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