Prices for furnaces upward thrust if the unit requires a plenum rebuild or transitions; correct airflow is standard to prevent

https://canvas.instructure.com/eportfolios/3603761/home/why-you-should-invest-in-a-smart-thermostat-for-your-ac-system_2

Prices for furnaces upward thrust if the unit calls for a plenum rebuild or transitions; ideal airflow is mandatory to avoid noise and uneven heating.