When winter settles in across Pennsylvania, your furnace works harder and longer than at any other time of year. While some operational noise is normal, new, loud, or persistent furnace sounds are often early warning signs of problems that can escalate quickly—especially during cold snaps when your system is under constant demand.
If your furnace has started banging, rattling, whistling, humming, or screeching, understanding what those sounds mean can help you protect your comfort, safety, and budget this winter.