Airflow Basics
Give the Return-Air Grille Space to Breathe
Before changing thermostat settings, check whether furniture or stored items are obstructing a return-air grille and document persistent comfort problems.
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HVAC maintenance
System Care
Buying an HVAC Filter? Check the Label and the Fit First
Compare HVAC filters using the system requirements, actual dimensions, airflow direction and fit rather than the highest rating alone.