Pilot Light vs Electronic Ignition Furnaces: Minnesota Homeowner's Guide

Pilot Lights vs Electronic Ignition: Understanding Your Furnace

If you're troubleshooting an older furnace or shopping for a new one, understanding the difference between standing pilot lights and electronic ignition systems helps you diagnose problems and make better purchasing decisions. Nearly all furnaces made after 1990 use electronic ignition — but millions of older Minnesota homes still have pilot-light furnaces running.

Standing Pilot Light Furnaces

Older furnaces (typically pre-1990) use a standing pilot — a small flame that burns continuously, ready to ignite the main burners when heat is called for. Standing pilots are reliable but waste gas constantly (up to $10–$15/month keeping the flame lit year-round). If the pilot goes out — from a draft, gas interruption, or thermocouple failure — the furnace won't fire. Relighting a standing pilot is a simple DIY task described in your furnace manual.

Thermocouple failure is the most common pilot-related repair. The thermocouple is a safety device that detects whether the pilot is lit — if it fails, it shuts off the gas even when the pilot is burning. Thermocouple replacement is inexpensive ($20–$50 part) and often a DIY repair.

Electronic Ignition Systems

All modern Goodman furnaces use electronic ignition — no standing pilot. Two types exist:

• Intermittent pilot (spark ignition): Creates a spark to light a pilot only when heat is called for. More efficient than standing pilot but less common in modern high-efficiency furnaces.
• Hot surface ignitor (HSI): The standard on virtually all modern furnaces including all current Goodman models. A silicon nitride or carbide element heats to 1,800°F+ and directly ignites the gas. Reliable and efficient, but the ignitor itself is a wear item — see our ignitor guide for failure signs and replacement.

If Your Pilot-Light Furnace Is Aging

A furnace old enough to have a standing pilot is almost certainly past 25+ years old — well past the end of its efficient life in Minnesota's demanding climate. Upgrading to a modern Goodman from Furnace Direct delivers 96% AFUE efficiency versus the 60–70% typical of pilot-era furnaces. See our replacement cost guide and rebates guide.