Meet the HVAC specialist responsible for keeping SEPTA buses cool

PHILADELDELPHIA (WPVI) -- Commuters who rely on SEPTA to get them to work, appointments and shopping owe a debt of gratitude to the men and women behind the scenes who keep the transit system running.

We're turning the spotlight on an HVAC specialist who's responsible for keeping those buses cool in the summer and warm in the winter.

Action News photojournalist Todd Haas introduces us to Christin Coston.