Heating Services

Is Your Furnace Blowing Cold Air, Cycling On and Off Every Few Minutes, or Making Noises You've Never Heard Before?

Is your furnace blowing cold air, cycling on and off every few minutes, or making noises you've never heard before? These aren't quirks you ignore — they're signs your heating system needs professional attention before a cold night turns into a crisis. Smith Heating, Air & Sheet Metal handles these calls every day across Southern Illinois, and we're ready to help you figure out what's wrong and get your heat back.

We're not a call center three states away reading a script. We're your neighbors in Steeleville, and we've been inside thousands of furnaces across Chester, Sparta, Red Bud, Pinckneyville, Nashville, Du Quoin, Murphysboro, and Perryville. When you call Smith Heating, Air & Sheet Metal, you're talking to someone local who knows the housing stock in these towns — the old farmhouses with gravity furnaces, the split-levels with undersized returns, the newer builds with builder-grade equipment already showing its limits. We show up with tools, parts, and the experience to diagnose what's actually wrong.

Heating Installation & Replacement — When Repair Isn't Enough

Most people don't wake up planning to replace their furnace — they wake up because it died overnight, or because the repair estimate is two-thirds the cost of a new system, or because they've been nursing a 20-year-old unit through one expensive failure after another and the math finally stopped making sense.

Here's what we see that leads to replacement: heat exchangers crack (especially in older furnaces that have been running hard for 15-20 years), and once that happens, you're done. A cracked heat exchanger is a carbon monoxide risk and not something you patch. Blower motors fail, and if the rest of the system is already marginal, replacing an $800 motor on a furnace that might give you two more years isn't always the smart play. Ignitors go out, gas valves stick, control boards fry — any one of those is fixable in isolation, but when you're looking at a furnace that's had three service calls in two years, runs loud, cycles short, and costs more every month to do less heating, replacement becomes the conversation.

What We Size For

We size the new system to your actual load — not the number stamped on the old unit, not a guess based on square footage. We calculate heat loss, account for insulation, ductwork condition, and window quality. We talk through efficiency ratings (AFUE) in plain language: an 80% furnace puts 80 cents of every gas dollar into heat, a 95% furnace puts 95 cents in. The difference shows up in your utility bill every month for the next 15 years. We don't upsell efficiency you won't use, and we don't undersize to hit a price point.

Installation day: we pull the old unit, inspect and modify ductwork if needed (poorly sized ducts choke even a great furnace), set and level the new furnace, make all gas and electrical connections, test for leaks, check combustion, verify airflow at every register, and walk you through the new thermostat. We pull permits, we leave the site cleaner than we found it, and we make sure you know how to operate and maintain what we just installed. If it's a two-day job because we're also upgrading ductwork or adding zones, we make sure you have heat overnight.

If your system has already made the decision for you, or if you're weighing repair versus replacement, explore our complete Heating Installation & Replacement coverage to see how we approach new system design and installation across Southern Illinois.

Heating Repair & Service — Diagnosing What's Actually Wrong

Most heating repairs start with a symptom the homeowner can describe but not diagnose: the furnace won't fire, the blower runs but there's no heat, the system cycles on and off every two minutes, there's a banging noise in the ductwork, or the house heats unevenly — one room is 72°, another is 58°.

We start every repair call with real diagnostic work. Not a guess, not a part swap based on what "usually" fails. We check the thermostat first (you'd be surprised how often the issue is there — bad wiring, a dying battery, or a location reading the wrong temperature because it's near a draft). Then we move to the furnace itself: Is the ignitor glowing? Is the gas valve opening? Is the flame sensor detecting combustion and keeping the gas flowing? Is the blower motor running at the right speed? Is the limit switch tripping because the heat exchanger is overheating (which usually means restricted airflow — dirty filter, closed vents, undersized ducts)?

Common Failures We Repair Constantly

- Ignitors burn out (they glow white-hot every time the furnace fires, and they don't last forever) - Flame sensors get coated with carbon buildup and stop detecting the flame, so the system shuts down 3-5 seconds after it lights - Blower motors seize or run weak because the bearings are shot - Capacitors fail and the blower won't start - Pressure switches fail and the furnace thinks it's not venting properly (or it actually isn't venting properly because the flue is blocked or the inducer fan is clogged) - Thermocouples on older systems fail and the pilot won't stay lit - Gas valves stick and control boards fail

We carry common parts on the truck — ignitors, flame sensors, capacitors, filters, thermostats. If it's something we can fix same-visit, we do. If it's a major component (heat exchanger, blower assembly, gas valve), we give you the repair cost, the expected life of the rest of the system, and what a replacement would run — then you decide. We're not in the business of selling new furnaces to people who just need a $200 part. But we're also not going to put $1,500 into a system that's going to need another $1,500 six months from now if you've got better options.

One thing we see all the time: a "broken" furnace that's actually just screaming for Heating Maintenance & Tune-Up. A clogged filter chokes airflow, the limit switch trips, the furnace shuts down, and the homeowner thinks it's dead. We swap the filter, reset the system, check airflow, and it runs fine. That's a $120 service call instead of a $4,000 replacement — but only if you call before you've been running it into the ground for three months.

Whether it's a no-heat emergency or a system that's running but not running right, see how we approach Heating Repair & Service with honest diagnostics and transparent pricing across Southern Illinois.

Heating Maintenance & Tune-Up — Catching Problems Before They Strand You

The difference between a furnace that dies at 3 AM in January and one that gives you 15 reliable years is almost always maintenance — or the lack of it.

A tune-up is a full system inspection and cleaning before the heating season puts load on the equipment. We pull and inspect the burners (they get clogged with dust and debris, and dirty burners burn inefficiently and create carbon buildup). We check and clean the flame sensor (the number one cause of nuisance shutdowns). We test the ignitor for cracks and weak glow. We inspect the heat exchanger for cracks or corrosion (a cracked heat exchanger is a safety issue — combustion gases can leak into your air supply). We check all gas connections for leaks. We test the pressure switch and the inducer motor. We pull the blower, clean the blower wheel (a dirty wheel moves less air and makes the motor work harder), and check the motor bearings and capacitor.

What We Verify

We also verify airflow: dirty filters, closed vents, blocked returns, and undersized ductwork all choke the system. A furnace that can't move air overheats, and when it overheats, the limit switch trips and shuts it down. That's not a broken furnace — that's a furnace protecting itself from damage you're causing by starving it of airflow. We measure temperature rise (the difference between return air temp and supply air temp) to make sure combustion efficiency is where it should be.

On the safety side: we test for carbon monoxide, check the flue and venting for blockages or backdrafting, verify that the flame is blue and stable (yellow or lazy flames mean incomplete combustion), and make sure all safety switches are working. A furnace is a controlled fire inside a metal box in your house. If the safeties aren't working, that's not something you want to find out the hard way.

The ROI on maintenance is straightforward: a $120-$150 tune-up catches a $300 repair before it becomes a $1,200 emergency. It keeps the system running at peak efficiency (a dirty furnace works harder and costs more to run). And it adds years to the equipment life. We see 20-year-old furnaces that have been maintained annually still running strong, and we see 8-year-old furnaces that have never been touched failing expensively. The equipment is the same. The maintenance is the difference.

We recommend annual maintenance before the heating season starts — late summer or early fall, before you need the system and before we're slammed with no-heat calls. If you haven't had a tune-up in two or three years (or ever), that's the first call to make. Prevent the 3 AM breakdown and keep your system running efficiently with our Heating Maintenance & Tune-Up services across Southern Illinois.

How Smith Heating, Air & Sheet Metal Works

When you call Smith Heating, Air & Sheet Metal, you're talking to someone local who's going to show up in a truck with tools and parts — not a call center that's going to route you through three menus and schedule you four days out. We serve a 30-mile radius around Steeleville, and we know the housing stock in these towns: the old farmhouses with gravity furnaces and marginal ductwork, the 70s-era split-levels with undersized returns, the newer builds with builder-grade equipment that's already showing its limits.

When we arrive, we listen first. What are you noticing? When did it start? What have you tried? Then we go look at the equipment. We diagnose methodically — not by swapping parts until something works, but by testing components and tracing the failure. If it's a $40 part, we tell you it's a $40 part. If it's a major component and the system is old enough that replacement makes more sense, we tell you that too, with numbers. We don't upsell. We don't push financing you don't need.

We're licensed and insured, we pull permits when required, and we follow code. If we open up a furnace and find something dangerous — a cracked heat exchanger, a gas leak, improper venting — we're going to tell you and we're going to recommend shutting it down until it's fixed. We're not going to walk away from a safety issue because it's uncomfortable to bring up.

After the work: we test everything, we clean up our mess (drop cloths, shoe covers, we don't leave your basement looking like a disaster area), and we walk you through what we did and what you should watch for going forward. If you've got questions three days later, call us. If something doesn't seem right, we come back. We're not a national franchise that disappears after the invoice clears — we're local, and our reputation is our business.

Complete HVAC & Sheet Metal Services

Heating problems don't exist in a vacuum. If your ductwork is undersized, leaking, or poorly designed, even a perfect furnace won't heat your house evenly or efficiently. If your air conditioning system is ancient and you're looking at replacing your furnace, it often makes sense to replace both at once (matched systems run better, and you're only paying for labor and permits once). And if you're dealing with comfort problems — hot and cold spots, rooms that never get enough air, a system that runs constantly but never quite gets there — the issue might not be the equipment at all. It might be the ducts.

We offer complete HVAC services across Southern Illinois, and we approach every job as a system — not just a box on the wall. If you're dealing with cooling issues or looking at an AC replacement, our AC Installation & Replacement in Steeleville services cover new system design, load calculation, and proper installation. If your ductwork is the weak link — undersized runs, leaking joints, poor layout — our Custom Fabrication in Steeleville team can design and fabricate custom ductwork that actually delivers the airflow your system needs.

Get the Heating Help You Need

If your furnace isn't heating, or it's heating inconsistently, or it's making noises that weren't there last week, or your gut is telling you something's not right — don't wait until it's 20° outside and you're in full crisis mode. The best time to deal with a heating problem is right now, when you've still got options and we're not triaging no-heat emergencies across three counties.

Smith Heating, Air & Sheet Metal has been keeping homes warm across Southern Illinois for years, and we've seen every failure mode a furnace can throw at you. Whether you need a repair, a replacement, or just an honest second opinion on what's actually wrong, contact us and let's get it handled.