Furnace Repair in Tampa, Florida

Looking for furnace repair in Tampa? Here's the truth: most homes in Tampa don't have furnaces—they've got heat pumps. But if you're in one of the older neighborhoods around Carrollwood, parts of Temple Terrace, or some homes near USF, you might actually have a gas or electric furnace tucked away in the attic or garage. And when that furnace quits working on a 45-degree January morning, you need it fixed fast.

At On The Way Heating & Air, we fix both gas and electric furnaces throughout North Tampa. Call us before 3 PM and we'll get it done today—or you don't pay. That's our Same Day… Or Don't Pay promise.

Why Furnaces Are Less Common in Tampa (But Still Around)

Most Florida homes built after 1990 have heat pumps, not furnaces. Heat pumps provide both heating and cooling in one system—makes sense in a place where you need AC nine months a year and heat for maybe two months.

But furnaces still exist in Tampa, especially in:

Older homes built before 1985. Back then, builders installed separate AC and furnace systems (usually gas furnaces if the home had gas lines for water heaters or cooking).

Homes with natural gas service. If your street has natural gas, some homeowners prefer gas furnaces for heating because gas is cheaper per BTU than electricity. You'll pair it with a separate AC for cooling.

Additions or converted spaces. Sometimes folks add electric furnaces to converted garages, Florida rooms, or workshop spaces where running ductwork from the main system doesn't make sense.

Dual-fuel systems. Some newer installations pair a gas furnace with an electric heat pump for maximum efficiency—heat pump handles mild temps (50-70°F), furnace kicks in when it gets really cold.

If you've got a furnace, you already know you're in the minority. That also means some HVAC companies in Tampa don't stock furnace parts or have much experience fixing them. We do. Our trucks carry common furnace components, and our techs work on furnaces regularly.

How You Know Your Tampa Furnace Needs Repair

Furnaces fail differently than heat pumps. Here's what to watch for:

No heat at all. You turn the thermostat to "heat," bump it up, and… nothing. No warm air, no sound from the furnace. That's usually ignition failure (gas furnaces) or a blown heating element (electric furnaces).

Blowing cold air. The blower's running, air's coming out the vents, but it's room temperature or cold. Your furnace isn't actually heating—could be a failed ignitor, bad gas valve, or burned-out heating elements.

Furnace starts then shuts off immediately. Fires up for 30 seconds, shuts down, tries again, shuts down. That's short cycling, usually caused by a dirty flame sensor (gas furnaces), bad limit switch, or clogged filter restricting airflow.

Strange smells. A little dust smell when you first fire it up for the season is normal. Persistent burning smell, electrical smell, or (for gas furnaces) a rotten egg smell means shut it down and call us immediately.

Loud noises. Banging, popping, screeching, or grinding from the furnace cabinet. Could be a failing blower motor, cracked heat exchanger (dangerous), or loose components.

Pilot light won't stay lit (older gas furnaces). Newer gas furnaces use electronic ignition, but if yours has a standing pilot light and it keeps going out, that's a bad thermocouple or pilot assembly.

Yellow or flickering flame (gas furnaces). A gas furnace flame should be blue. If it's yellow, orange, or flickering, you've got incomplete combustion—could indicate a cracked heat exchanger or carbon monoxide risk. Shut it off and call us.

Pro-Tip: Before calling for furnace repair, check your filter. Sounds basic, but a clogged filter is the #1 cause of furnace problems in Tampa. When the filter's gunked up with dust, dirt, and humidity-driven mold, airflow drops. Your furnace overheats and shuts down on a safety limit switch. Change the filter, wait 10 minutes, and try again. If that doesn't fix it, call us.

Common Furnace Repairs in Tampa

Here are the furnace repairs we see most often in North Tampa:

Gas Furnace Repairs

Ignitor replacement. Modern gas furnaces use a hot surface ignitor (looks like a ceramic rod that glows orange) to light the gas. These crack from heat cycling and need replacement every 5-7 years. When they fail, the furnace won't light.

Flame sensor cleaning or replacement. The flame sensor is a thin metal rod that sits in the flame. It detects whether gas is actually burning. When it gets coated in soot or corrosion, the furnace thinks there's no flame and shuts off the gas valve. We clean or replace it.

Gas valve failure. The gas valve controls gas flow to the burners. When it fails (usually electrically), no gas flows, no heat. Replacement required.

Thermocouple replacement (older furnaces). If your gas furnace has a standing pilot light (rare in Tampa but some old systems still have them), the thermocouple is a safety device that shuts off gas if the pilot goes out. When thermocouples fail, the pilot won't stay lit.

Heat exchanger cracks. This is the big one. The heat exchanger is where combustion happens—hot gases flow through it, warming the air that blows into your house. If it cracks (from age, corrosion, or overheating), combustion gases can leak into your home's air. That's a carbon monoxide risk. Heat exchanger replacement costs almost as much as a new furnace, so if yours is cracked and the furnace is 15+ years old, replacement makes more sense.

Electric Furnace Repairs

Heating element failure. Electric furnaces use coils (like a giant toaster) to heat air. These burn out from constant cycling. You'll get weak heat or no heat. We test each element and replace the bad ones.

Sequencer replacement. The sequencer staggers when each heating element turns on (so you don't overload the electrical panel). When it fails, elements don't energize, or they all turn on at once (trips breakers). Replacement fixes it.

Blower motor failure. Same as any HVAC system—the blower moves air across the heating elements and through your ducts. When it fails, you get no airflow. Motor replacement required.

Contactor or relay failure. These are electrical switches that control power to the heating elements. When they fail, elements don't get power, no heat.

Both Gas and Electric Furnaces

Limit switch problems. The limit switch shuts the furnace down if it overheats (usually from restricted airflow). When the switch fails, the furnace short-cycles or won't run at all. We test and replace it.

Blower motor capacitor failure. Same issue as AC systems—capacitors fail from Tampa's heat and humidity. When the blower capacitor dies, the blower won't start. Cheap, easy fix.

Thermostat issues. Sometimes the problem's not the furnace at all—it's a bad thermostat that won't call for heat properly. We test thermostat wiring and replace if needed.

Deep Dive: Gas Furnace Ignition Failure

Modern gas furnaces (pretty much anything built after 1990) use electronic ignition instead of a standing pilot light. There are two types:

Hot surface ignitor (most common). A ceramic or silicon carbide element heats to 2500°F and ignites the gas when the thermostat calls for heat.

Spark ignitor (less common). Creates a spark to light the gas, like a stove lighter.

When ignition fails, your furnace goes through its startup sequence—blower might run, you might hear gas flowing—but no flame, no heat. After a few attempts, it gives up and shuts down.

What Kills Ignitors in Tampa

Heat stress. That hot surface ignitor glows orange-hot every time your furnace fires up. In Tampa, where we only use heat sporadically (a few weeks in Dec-Jan), ignitors experience huge temperature swings—sitting cold for months, then cycling dozens of times during a cold snap. Thermal stress cracks them.

Humidity and corrosion. Florida's 75% humidity causes corrosion on electrical connections to the ignitor. When connections corrode, the ignitor doesn't get full voltage and won't heat up enough to light the gas.

Vibration. Ignitors are brittle ceramic. Normal furnace vibration, plus any settling of the house, can crack them over time.

Age. Hot surface ignitors last 5-7 years on average. If your furnace is 10+ years old and has the original ignitor, replacement is due.

How We Fix Ignition Problems

We test the ignitor electrically (should draw 3-6 amps when energized) and visually inspect for cracks. If it's bad, we replace it—takes about 30 minutes. We also check:

• Gas pressure at the manifold (should be 3.5" water column for natural gas)
• Flame sensor (might be shutting down good ignition)
• Gas valve operation (electrical and mechanical)
• Vent system (blocked vents prevent ignition for safety reasons)

Pro-Tip: If your gas furnace is trying to light but failing (you hear clicking or see the ignitor glow but no flame), check outside for the furnace vent pipe. Modern high-efficiency furnaces vent through PVC pipes on the side of the house. If that pipe's blocked by a bird nest, wasp nest, or just debris, the furnace won't light (safety feature prevents backdrafting). Clear the blockage and try again. Still doesn't work? Call us.

Deep Dive: Electric Furnace Heating Element Failure

Electric furnaces work like a giant toaster. Inside the furnace cabinet are heating elements—coils of resistance wire that glow red-hot when electricity flows through them. Air blows across these hot coils and into your ducts.

Most electric furnaces in Tampa have multiple elements (usually 3-5 elements, each 5kW-10kW). They stage on sequentially—first element heats, then if more heat's needed, second element kicks in, etc. This prevents overloading your electrical panel.

When elements burn out (and they do), you get weak heating. The furnace runs, blows air, but can't keep up with the thermostat setting.

What Kills Heating Elements in Tampa

Constant cycling. Every time an element energizes, it heats from room temp to 1000°F+ in seconds. When it shuts off, it cools. That thermal expansion/contraction stresses the wire. After thousands of cycles, the resistance wire breaks.

Corrosion. Tampa's humidity causes oxidation on the element connections. Poor connections create hot spots, and the element burns out faster.

Voltage fluctuations. Lightning strikes (Tampa's the lightning capital) and power surges stress heating elements. Even if your electronics are protected by surge suppressors, your furnace might not be.

Age. Heating elements last 10-15 years typically. If your electric furnace is 15+ years old and losing heat capacity, burned-out elements are likely.

How We Fix Heating Element Problems

We test each element electrically (checking resistance with a multimeter) to find which ones are bad. Then we replace the failed elements. This isn't a DIY job—electric furnaces run on 240V circuits, sometimes pulling 80-100 amps total. One mistake and you're dead or you burn your house down.

We also check:

• Sequencer operation (makes sure elements stage properly)
• Electrical connections (tighten, clean corrosion)
• Amp draw on each circuit (high amp draw indicates failing elements)
• Blower operation (if blower's weak, elements overheat)

Deep Dive: Flame Sensor Problems

This is the most common gas furnace repair we do in Tampa. The flame sensor is a safety device—a thin metal rod (about 1/4" diameter, 3-4" long) that sits right in the flame. It detects if gas is actually burning. If it doesn't detect a flame within a few seconds of the gas valve opening, it shuts everything down (prevents unburned gas from filling your house).

When the flame sensor gets dirty or corroded, it can't detect the flame even though fire's right there. The furnace lights, runs for 10-30 seconds, then shuts off. Tries again. Same thing. Endless short cycling.

Why Flame Sensors Fail in Tampa

Soot and carbon buildup. Over time, combustion deposits build up on the flame sensor rod. It's not "dirty" like dust—it's a thin layer of carbon from the flame itself. That layer insulates the rod so it can't sense flame.

Corrosion. Florida humidity causes oxidation on the metal rod and its electrical connection. Corroded sensors don't conduct properly.

Infrequent use. Furnaces that sit idle for 10 months (most Tampa furnaces) develop more corrosion and buildup than furnaces that run regularly.

How We Fix Flame Sensor Problems

Simple fix: we pull the flame sensor out of the burner assembly and clean it with fine sandpaper or steel wool. Takes 10 minutes. We also check:

• Sensor position (has to be in the flame properly)
• Electrical connections (clean corrosion, ensure good contact)
• Microamp reading (sensor should produce 2-6 microamps when in flame)
• Burner condition (clean burners prevent sensor contamination)

Pro-Tip: You can clean your own flame sensor if you're handy. Shut off power to the furnace at the breaker, shut off the gas valve, remove the burner access panel (usually a couple screws), and locate the flame sensor (thin metal rod sticking into the burner area). Unscrew it (usually one screw), gently rub the sensor rod with fine sandpaper or steel wool (don't use regular sandpaper—too coarse), wipe it clean, reinstall. Turn power and gas back on. Try the furnace. If that fixes it, you just saved a service call. If it doesn't, call us—there's something else wrong.

What You Can Check Before Calling for Furnace Repair

Before you call us, try these things (might save you a service call):

If none of that fixes it, you need professional help. That's where we come in.

Related Heating Services

• Heat Pump Repair – For heat pump systems
• AC Maintenance – Keep your cooling system running
• AC Repair – When your AC needs attention
• AC Installation – New system installation

The On The Way Heating & Air Guarantee

We don't play games. Here's what you get when you call us:

Frequently Asked Questions