Check your HVAC air filter every month—defer to your owner’s manual for where filters are located—and wait no longer than 90 days to replace if you see an issue.

Variable Air Flow for Heating, Ventilation and Air Conditioning Systems A variable air volume box controls the air flow to a given space. When the space is unoccupied, the box closes off the heat and ...

NEWS10’s Spencer Tracy got an inside look at how HVAC systems work and how they can circulate air flow. HVAC stands for heating, ventilation, and air conditioning.

There are a few things to keep in mind when determining how often you should change your the air filters on your heating and cooling systems.