What Does a Furnace Tune-Up Include?

A tune-up is not a filter swap

Some companies call a quick look and a new filter a “tune-up” and use the visit to find something to sell. A real tune-up is a checklist. It’s how we catch the small, cheap problems in October so they don’t become a no-heat call in January.

Here’s what we go through on a typical gas furnace around Munster, Dyer and the rest of our area. Every furnace is a little different, but these are the parts of the job that matter.

Safety checks come first

Heat exchanger inspection

The heat exchanger keeps combustion gases separate from the air you breathe. We look at what’s visible for cracks, rust-through and soot patterns that suggest a problem. If we see something, we show you, with a photo when we can.

Carbon monoxide testing

We test for carbon monoxide around the furnace and in the flue. We’ll also remind you to test your own CO alarms. If a CO alarm ever goes off, get everyone out and call 911.

Safety controls

We test the limit switch, the rollout switches and the pressure switch. These are the parts that shut the furnace down if it overheats, if flames roll out of the burner area or if the vent isn’t drawing. They need to work every time.

Venting

We check that the flue or PVC vent is intact, sloped right and clear. On high-efficiency furnaces, we look at the outside intake and exhaust pipes, which can get blocked by snow, ice or nests.

Burners and ignition

• Burners: inspected and cleaned as needed so the flame burns clean and even.
• Igniter: checked for cracks and tested. A weak igniter is easier to replace on a calm fall afternoon than at midnight.
• Flame sensor: cleaned and tested. A dirty sensor is one of the most common reasons a furnace lights and then shuts off.
• Gas pressure: measured and compared to the manufacturer’s spec. Too high or too low affects safety and efficiency.

Airflow and the blower

Airflow is where most furnaces get worn out early. We check the filter and tell you the right size and schedule. We inspect the blower wheel for dirt buildup, check the motor and its capacitor, and measure temperature rise across the furnace to make sure it’s in the range the manufacturer lists. A furnace running outside that range is working harder than it should.

Electrical and controls

• Tighten and inspect wiring connections.
• Check the control board for error codes and signs of heat damage.
• Measure motor amp draws.
• Check the thermostat: correct settings, accurate reading, and that it actually starts and stops the furnace.

High-efficiency extras

If your furnace vents through white PVC pipes, it makes water. We check and flush the condensate drain and trap, and test the condensate pump if there is one. Clogged drains are one of the most common no-heat calls on these furnaces, and they’re easy to prevent.

What you get at the end

You get a plain list of what we checked and what we found. If everything’s good, that’s what it says. If something needs attention, the repair price is written down before any work starts, and you decide. No pressure, and no “comfort advisor” showing up afterward.

Age isn’t a finding. We won’t write “furnace is 15 years old, recommend replacement” on your sheet. We’ll write what’s actually going on. For more on that, see how long a furnace lasts in Northwest Indiana.

What you can do between visits

• Change the filter on schedule. Check it monthly during heavy use.
• Keep vents and returns open and uncovered.
• Keep the furnace area clear. It needs air, and we need room to work.
• Clear snow from outside vent pipes after storms.
• Test your CO and smoke alarms twice a year.

ENERGY STAR and the Department of Energy both publish solid maintenance basics for homeowners. Links are below.

A tune-up is not a repair visit

A tune-up is scheduled preventive work on a furnace that’s running. A repair visit is for a furnace that isn’t. If we find a worn part during a tune-up, we tell you what it is, why it matters and what it costs to replace. Then you choose: fix it now, fix it later, or keep an eye on it. Some things, like a cracked heat exchanger or a high CO reading, we’ll flag as urgent. Most things aren’t.

We’d rather give you a short list of honest findings than a long list designed to scare you. A furnace in good shape gets a sheet that says so.

Houses around here

Northwest Indiana has a mix. Older brick bungalows in Hammond and Whiting often have an older standard-efficiency furnace venting into a chimney. Ranches in Highland and Munster sometimes have the furnace tucked in a crawlspace or tight closet. Newer subdivisions in St. John and Crown Point mostly have high-efficiency furnaces with PVC venting. The checklist is the same, but where we spend extra time changes: chimney venting on the older homes, condensate drains on the newer ones, access and airflow in the tight spaces.

When to book

Early fall is best, before the first cold week. That’s when a small fix is easy to schedule and the furnace hasn’t been working hard yet. If you missed fall, a mid-winter tune-up still beats none.

Book through our seasonal tune-ups page or call (219) 555-0142. If the furnace is already acting up, skip ahead to why a furnace won’t light or book a repair visit like furnace repair in Dyer. We cover about 20 miles around Munster; see the full service area.