What are signs my HVAC system is oversized?

Signs include frequent short cycling, uneven room temperatures, higher-than-average energy bills, cycles under 10 minutes, noisy airflow, or a contractor sizing equipment based on square footage alone.

Why is short cycling a problem?

Short cycling wears out HVAC components, wastes energy, causes uneven comfort, and reduces equipment lifespan.

How does Manual J prevent oversizing?

Manual J uses real building data like insulation, windows, air leakage, and climate zone to calculate the true heating or cooling load, ensuring the system is correctly sized.