Once a year, in the fall. The value is not abstract — annual service prevents a specific and predictable list of failures, and nearly every no-heat call we run in January was findable in October.

The Failures It Actually Prevents

Igniter failure. Hot surface igniters are a wear item with a finite number of cycles. They are tested during service and replaced when resistance drifts out of spec. Left alone, they fail — reliably on the coldest night, because that is when the furnace cycles most.

Dirty flame sensor. The flame sensor confirms the burner actually lit. When it fouls, the furnace lights, fails to sense flame, and shuts down within seconds — over and over. It is a five-minute cleaning during a tune-up and a no-heat call if ignored. This is one of the most common winter failures there is.

Pressure switch faults. These verify the inducer is drawing properly before gas is released. Blocked tubing or a failing inducer trips them and locks the furnace out.

Blower capacitor failure. An inexpensive part that is measured, not eyeballed. A capacitor below spec is replaced during service; left alone it takes the blower motor with it.

Limit switch trips. Usually caused by restricted airflow. The furnace overheats, shuts down on the safety, and cycles repeatedly without heating the house.

The One That Is Not About Convenience

The heat exchanger inspection is the reason fall service is not optional.

A heat exchanger separates combustion gases from the air circulating through your home. When it cracks — from age, metal fatigue, or overheating caused by a neglected filter — carbon monoxide can enter your supply air. It is colorless and odorless, and early symptoms resemble the flu.

Combustion analysis measures what is actually leaving the flue, catching problems well before they become emergencies. Venting gets inspected for obstruction. Safety controls get tested rather than assumed.

Because Hill Country heating season is short, homeowners are tempted to skip fall service. This is the argument against it.

Why Timing Matters as Much as Frequency

Servicing in fall means finding problems while they are still repairs.

Hill Country freezes arrive suddenly, and when one does, every heating call in the county comes in within about eighteen hours. Backlogs stretch, parts move fast, and a failure that would have been a routine visit in October becomes an emergency heating repair with a wait attached.

There is a plumbing dimension too. A Texas home without heat during a sustained freeze is at risk of burst pipes, because supply lines here often run through unconditioned attics. The water damage costs far more than the furnace repair.

What You Handle Between Visits

Change the air filter. This prevents more failures than anything else you can do, because restricted airflow is what causes limit trips and contributes to heat exchanger cracking.

Check monthly and replace when dirty rather than following the package interval. Keep the area around the furnace clear so it has combustion air. Check the exterior vent termination after storms.

Watch the burner flame — steady blue is correct. Yellow or orange means incomplete combustion and warrants a call.

Heat Pumps Are Different

If you have a heat pump rather than a furnace, the same equipment runs year-round, which doubles the runtime hours. Twice-yearly service is the schedule there, and the reversing valve and defrost cycle need verifying — items a furnace checklist does not cover.

Making It Happen

The obstacle is never cost. It is remembering in October when the weather is fine.

Our Care Club maintenance plan handles the scheduling and adds priority dispatch for the week everyone else is calling. Most manufacturer warranties also require documented annual furnace maintenance to stay valid.

Contact 72 Degrees or call (830) 468-5316.