Based on 155+ Reviews!Your Furnace Is Talking. Your Bill Is Doing the Translating.
You opened your Evergy bill last month and blinked at it. Then the Kansas Gas bill showed up and did the same thing to you.
Nothing changed at your house. Same thermostat setting. Same people. Same drafty back bedroom you’ve been meaning to deal with since 2019.
So why does heating your home cost more every year?
Here’s the thing. If your furnace is 15 years old or older, it’s not broken — it’s tired. And a tired furnace doesn’t announce itself with a dramatic failure. It quietly charges you extra, month after month, until one cold January night when it finally quits.
Look, we get that you don’t have a free Saturday to crawl around your basement with a flashlight and a YouTube tutorial. Most people don’t. So this article skips the lecture and gets to what actually matters: why old furnaces get expensive, what you can check in under 20 minutes, and how to tell the difference between “worth maintaining” and “time to replace.”
Why a 15-Year-Old Furnace Costs More Every Winter
A furnace doesn’t fall off a cliff. It slides.
Bearings wear. Burners collect dust. The heat exchanger picks up tiny cracks you’d never see. Airflow drops a little each year because filters get changed late and ductwork collects Flint Hills dust like it’s a hobby.
None of that makes the furnace stop. It just makes it run longer to do the same job.
And running longer is exactly what shows up on your bill.
The Evergy Surprise Nobody Warns You About
Most people assume a gas furnace only affects the gas bill. Makes sense, right? Gas makes heat.
But your furnace also has a blower motor, and that motor runs on electricity. When the filter is dirty or the coil is clogged, that motor fights for air and pulls more power — and it stays on longer per cycle.
That’s an Evergy problem, not a Kansas Gas problem.
So when both bills creep up at the same time and you can’t explain it, that’s not a coincidence. That’s usually airflow. It’s one of the most common things we find on furnace maintenance calls in Manhattan, and it’s often one of the cheapest to fix.
The Kansas Gas Side of the Story
On the gas side, the story is combustion.
Burners get coated. The flame sensor gets a film on it and starts short-cycling the system — on, off, on, off — which burns fuel without ever really warming the house. Older 80% AFUE units send a fifth of your gas dollars straight up the flue by design, and a neglected one does worse than that.
Frustrating? Absolutely. You’re paying for heat that never reaches your living room.
The 20-Minute Version for People Who Don’t Have All Weekend
You do not need to become an HVAC hobbyist. But there are three checks worth your time before the first hard freeze.
Start with the filter. Pull it out and hold it up to a light. If you can’t see light through it, it’s been choking your system — and it’s been costing you on both utilities. In a Manhattan home with pets or a gravel driveway, monthly is realistic, not every three months like the box says.
Next, walk your house and look at the supply registers. If half of them are closed, blocked by a couch, or buried under a rug, you’ve created pressure your blower has to fight. Open them up. All of them.
Finally, listen and look. Fire the system up and watch the burner flame. It should be steady and blue. Yellow, lazy, or flickering flame is a “call somebody today” signal, not a “keep an eye on it” signal. Same goes for a grinding sound, a burning smell that doesn’t clear in 20 minutes, or a system that cycles on and off every few minutes.
The exception? If you have a heat pump with gas backup, or a furnace in a crawl space you can’t safely reach, skip the DIY entirely. Get eyes on it from someone who does this every day.
What a Real Maintenance Visit Catches That You Can’t
Here’s where honesty matters more than a sales pitch.
Changing your filter is real maintenance. It helps. But there’s a whole category of problems that only show up with test equipment — and those are the ones that cost real money or, in a few cases, actually matter for safety.
A technician measures the temperature rise across the heat exchanger and compares it to the manufacturer’s spec. Out of range means airflow or combustion trouble you’d never feel standing in the hallway. They test the inducer motor amp draw, which tells you a motor is dying months before it dies. They inspect the heat exchanger for cracks — the single most important check on any furnace past year 12, because a cracked exchanger can put carbon monoxide into your air.
They also test static pressure, which is the closest thing there is to a blood-pressure reading for a duct system. High static pressure is the quiet reason a lot of Kansas homes have one freezing bedroom and one roasting one.
That’s the difference between cleaning a furnace and actually knowing its condition.
Maintain It or Replace It? How We’d Actually Decide
There’s no magic number. But after serving Manhattan-area homes since 1923, we’ve seen enough furnaces to know where the lines usually fall.
| Furnace Age | What’s Usually Going On | Typical Efficiency | What We’d Recommend |
|---|---|---|---|
| 0–8 years | Normal wear, minor buildup | 90–96% AFUE | Annual tune-up; repairs are almost always worth it |
| 9–14 years | Motors and igniters start failing | 80–92% AFUE | Annual tune-up; repair, but start budgeting |
| 15–20 years | Heat exchanger fatigue, rising run times | Often 75–80% real-world | Full inspection each fall; weigh repair cost against replacement |
| 20+ years | Parts get scarce, safety risk climbs | Frequently under 75% | Get a replacement quote before it fails, not after |
A useful gut check: if a single repair costs more than a third of a new system, and the furnace is past 15, that money is usually better spent on a new furnace installation than on one more winter of hoping.
But — and this is the part a lot of companies skip — plenty of 16-year-old furnaces have years left. A well-built unit that got regular service can absolutely be worth keeping. Anyone who tells you to replace it based on the year alone, without testing it, isn’t diagnosing. They’re selling.
What Happens When You Call Standard
You shouldn’t have to know what’s wrong before you pick up the phone. That’s our job.
When you call Standard Plumbing, Heating & Air, you’ll often get help before anyone even gets in a truck — our office staff has been known to walk homeowners through a simple fix over the phone at no charge. If it turns out to be a tripped switch or a filter, we’d rather tell you that than bill you for it.
If a tech does come out, the process is the same every time. We diagnose, we explain what we found in plain English, we give you options with prices, and you decide. No pressure, no mystery, no “well, you’re going to need a whole new system” without showing you why.
That approach is why Standard has been the company Manhattan, Wamego, and Junction City families call for generations. Same local technicians, background-checked and trained on current equipment. Same after-hours emergency service when your furnace quits at 2 a.m. and the wind chill is below zero.
Frequently Asked Questions
How often does a furnace really need maintenance?
Once a year, in the fall, before you need it. Furnaces in Kansas take an unusual beating because our shoulder seasons swing so hard — a 70-degree afternoon followed by a 25-degree night means short, frequent cycles, which is the hardest way to run a system. If your furnace is past 15 years, a fall visit isn’t optional maintenance anymore; it’s your heat exchanger safety check.
Will furnace maintenance actually lower my Evergy and Kansas Gas bills?
It can, but be realistic about how. Maintenance restores the efficiency your furnace is capable of — it doesn’t create new efficiency. On a neglected 15-year-old system with a clogged filter, dirty burners, and restricted ducts, homeowners often see a meaningful drop because the system had been running well below its own rating. On a furnace that was already serviced last year, the savings are smaller and the real value is catching a failing part early.
Is a maintenance plan worth it, or is it just a subscription?
It depends on whether you’d actually schedule the visits otherwise. Our VIP Maintenance Club exists because most people mean to call and then don’t, and the furnace gets skipped for three years running. If you’re the kind of homeowner who books it every September without a reminder, you may not need a plan. If you’re not, a plan is usually cheaper than the repair you’d have had.
My furnace works fine. Can I skip this year?
“Works” and “safe” aren’t the same test. Carbon monoxide has no smell, and the early stages of a cracked heat exchanger produce zero symptoms you’d notice. That’s specifically why the inspection exists on older equipment. If your furnace is under 10 years old and you’ve kept up on filters, skipping one year is a modest gamble. Past 15, it isn’t one we’d take.
Don’t Let This Winter Be the Expensive One
Your bills went up for a reason. Usually it’s airflow, combustion, or simple age — and all three are findable.
The short version: check your filter tonight, open your registers, and get a real furnace maintenance inspection on the calendar before the first hard freeze. If your system is over 15, make that inspection a priority instead of a someday.
And if something’s already not right — weak heat, strange noises, a system that won’t stay running — don’t wait for it to get worse in the middle of a cold snap. Standard Plumbing, Heating & Air has been keeping Manhattan-area homes warm for more than a century, and we’d rather look at it in October than rescue it in January.
Schedule service online, ask about our fall furnace tune-up, or just call Standard and describe what you’re hearing. We’ll tell you straight.
