Furnace Repair

Common causes: the thermostat fan setting is on ON instead of AUTO (circulating unheated air), a failed ignition so the burners never light, an overheating furnace tripping its limit switch and running the blower to cool down, or a clogged filter starving airflow. Each has a different fix — diagnosis tells you which you have.

That's short cycling, and it's usually a safety system doing its job: overheating from a clogged filter or blocked airflow, a faulty flame sensor, or a venting problem. Repeated cycling wears parts fast, so it's worth diagnosing before it becomes a bigger failure.

It can be. A cracked heat exchanger or venting fault can allow combustion gases, including carbon monoxide, into the home. If your CO alarm sounds, leave the house and call your gas utility or 911 first. Working CO detectors are essential in any home with gas appliances.

Same logic as cooling: weigh age, the specific failure, repair history, and your plans for the home. In our region it's also worth asking whether a heat pump should replace the furnace entirely when it reaches end of life — we'll walk you through both paths.