Can You Fix These Common Home System Failures? Test Your DIY Repair Skills!Share:FacebookPinterestTwitterMail4. How often should you replace HVAC air filters for optimal performance?16%Next Correct Incorrect Regular replacement keeps the air clean and the system efficient. 4. How often should you replace HVAC air filters for optimal performance? Every 6 months Every 1-3 months Once a year Only when dirty 16%
