Fixing Your Thermal Coupler for a Furnace Made Easy

If your heater is blowing cold air or won't stay on, it might be time to look at the thermal coupler for a furnace. This little copper rod is actually a huge part of your home's safety system, and when it starts acting up, your whole HVAC system basically goes on strike. It's one of those parts that costs about twenty bucks but can make you feel like you're living in the Stone Age if it stops working in the middle of January. ...

May 27, 2026 · 8 min · Aviel Mitchell