Musty or Moldy Odors: Causes & Fixes
Musty or moldy odors from vents are almost always caused by moisture, dirty coils, or duct contamination. Here’s how to fix it.
Smells & Odors
Smells & Odors
Burning Smell From Vents: Causes & Fixes
A burning smell from vents can be harmless or a warning sign. Here are the most common causes and what to do next.
Noises & Vibrations
Metal‑on‑Metal Scraping: Causes & Fixes
Metal‑on‑metal scraping is a serious HVAC warning sign. Here are the most common causes and what to do next.
Noises & Vibrations
High‑Pitched Whistling: Causes & Fixes
High‑pitched whistling happens when air is forced through a restriction. Here’s how to diagnose and fix whistling HVAC noises.
Noises & Vibrations
Buzzing or Humming Noises: Causes & Fixes
Buzzing or humming noises often come from electrical components, motors, or refrigerant issues. Here’s how to diagnose and fix them.
Noises & Vibrations
Rattling or Vibrating Equipment: Causes & Fixes
Rattling or vibrating HVAC equipment often means loose panels, debris, or failing motors. Here’s how to diagnose and fix it.
Noises & Vibrations
Banging or Knocking Sounds: Causes & Fixes
Banging or knocking sounds often come from duct expansion, ignition delays, or loose parts. Here’s how to diagnose and fix them.
Heating Problems
Burning Smell When Heat Turns On: Causes & Fixes
A burning smell when the heat turns on is often dust burning off, but sometimes it signals electrical or mechanical problems. Here’s how to tell the difference.
Heating Problems
Cold Air Blowing When Heat Is On: Causes & Fixes
When your furnace blows cold air, the cause is usually ignition failure, overheating, or airflow restrictions. Here’s how to troubleshoot it.
Heating Problems
Uneven Heating Throughout the Home: Causes & Fixes
Uneven heating happens when airflow is unbalanced or ducts are restricted. Here’s how to diagnose and fix uneven heat in your home.