10/27/2026
A chilly San Francisco morning, a quiet house and an unexpected noise when the heat turns on 🔊
A little popping from warming ductwork can be normal. Persistent whistling, repeated clicking without heat, or a loud bang at startup deserve closer attention.
We’ve put together a simple guide to four common heating sounds and what they may mean for your home. Take a look through the images below.
💡 If you notice a new noise, note when it happens and whether your home is still warming up. Those details can help a technician investigate.