For homeowners in Justice, IL, and the greater Chicago area, the transition from autumn to winter happens fast. One day it is brisk; the next, it is freezing. The worst time to discover your heating system has failed is during that first deep freeze – just as the worst time to find your AC not working is the first humid heat wave of summer.
Waiting until your unit breaks down completely is risky. Often, your system warns you well in advance that it is struggling. Recognizing these warnings early can save you from an emergency replacement in the middle of a blizzard.
At New Comfort Inc., we want to help you stay ahead of the cold. If you notice any of the following signs, it might be time to retire your old unit.
Unusually High Heating Bills
Have your energy costs spiked without a clear reason? As furnaces age, they lose efficiency, meaning they have to run longer to produce the same amount of heat.
- Compare your bills: Look at your gas or electric usage compared to the same month last year.
- The efficiency gap: A system installed 15 years ago may now be wasting up to 40% of the energy it consumes.
- The bottom line: If you are paying more for furnace service repair and energy bills while your home stays cold, you are throwing money away. A modern, high-efficiency replacement often pays for itself through monthly savings.
Frequent Furnace Repairs Needed
Are you on a first-name basis with your HVAC technician? While occasional tune-ups are normal, frequent breakdowns are a major red flag.
- The "Money Pit": If you have needed repairs more than twice in the last two years, the system is failing.
- Rising Costs: As parts wear out simultaneously, the cost of keeping the old unit alive often exceeds the value of the system.
- Availability: Older parts are harder to find, meaning you might be left without heat while waiting for a specific component.
Inconsistent Heating Throughout the Home
A healthy furnace should distribute warm air evenly to every room. If you are comfortable in the kitchen but freezing in the bedroom, your system is struggling.
- Weak Airflow: The blower motor may lack the power to push air through the ducts.
- Cold Spots: Specific rooms never seem to reach the set temperature.
- Thermostat Wars: You constantly have to adjust the thermostat to find a balance that doesn't exist. While sometimes furnace repair and service can fix this, in older units, it often indicates the system is undersized or simply worn out.
Strange Noises or Smells
Furnaces are not silent, but they shouldn't be loud or smelly. Trust your senses - if something sounds or smells wrong, it usually is.
- Noises: Banging, rattling, squealing, or grinding sounds often indicate loose parts or motor bearing failure.
- Smells: A persistent smell of burning rubber, plastic, or a "rotten egg" scent (gas) is dangerous.
- Safety Hazard: These aren't just annoyances; they are warnings that the structural integrity of the unit is compromised.
Furnace Age and Its Impact
The calendar is often the most reliable indicator. The average lifespan of a gas furnace is 15-20 years.
- The "Danger Zone": In our climate, furnace maintenance Chicago experts warn that systems over 15 years old are statistically likely to fail during peak usage.
- Obsolete Technology: Even if it runs, a 20-year-old furnace lacks the safety features and efficiency of modern models.
- Proactive vs. Reactive: Replacing an old unit before it dies allows you to choose the best system for your home, rather than taking whatever is available in an emergency.
Visible Signs of Damage or Rust
Take a flashlight and inspect your unit physically. Visible deterioration is a clear sign that internal components are likely in even worse shape.
- Rust and Corrosion: Look for rust on the flue pipes or the unit's body. This indicates moisture issues.
- Cracks: Any visible crack, especially on the heat exchanger, is a critical safety failure.
- Soot: Streaks of soot around the furnace suggest incomplete combustion. If a heating furnace repair service technician finds a cracked heat exchanger, immediate replacement is the only safe option to prevent carbon monoxide leaks.
Dry or Dusty Indoor Air
Your heating system affects your home's air quality, not just the temperature. An old, failing furnace can make your home environment uncomfortable and unhealthy.
- Excessive Dust: If dust accumulates quickly after cleaning, the furnace may not be filtering air properly.
- Dryness: Old units often strip humidity from the air, leading to dry skin, static shock, and respiratory issues.
- Stale Air: If the air feels "stuffy" or stale, the system isn't circulating fresh air effectively.
Difficulty Starting the Furnace
Does your furnace struggle to turn on?
- Short Cycling: The unit turns on and off frequently without reaching the target temperature.
- Delayed Ignition: You hear clicking sounds or a "whoosh" noise long before the heat starts.
- Constant Restarts: You have to manually reset the unit to get it going. These are symptoms of a tired system. While a tune-up might help temporarily, replacement is often the only permanent cure.
Furnace Repair or Furnace Replacement? Reading the Signs
Not every warning sign above means you need a new system. Some point to a straightforward furnace repair, while others suggest that furnace replacement is the smarter long-term choice. Here is a simple way to sort them:
- Often fixable with a furnace repair: a single noisy part, a dirty flame sensor, a worn igniter, a failed capacitor, or a clogged filter causing short cycling.
- Often a sign furnace replacement is near: a furnace over 15 years old, a cracked heat exchanger, rust and soot, frequent breakdowns, and steadily rising bills.
When several of the signs show up together on an older furnace, an honest assessment is the best next step. Learn more about our furnace replacement service, or read on if your problem is with cooling instead of heating.
AC Not Working? Common Causes to Check First
Your furnace is not the only system that sends warning signs. When summer arrives in Justice and the surrounding suburbs, many of the same symptoms – weak airflow, strange noises, rising bills – show up in air conditioners too. In most homes, the furnace and central AC share the same blower, ductwork, thermostat, and air filter, so a problem with one can easily affect the other.
If you find your AC not working, start with the most common causes below. Some have simple fixes you can handle yourself, while others call for a professional technician.
Thermostat and Power Problems
It sounds obvious, but a surprising number of AC repair calls turn out to be thermostat or power issues. Before assuming the worst, check that:
- The thermostat is set to “cool” and the set temperature is below the current room temperature.
- The display is working and the batteries are fresh.
- No breakers have tripped in your electrical panel – the AC usually has its own double breaker.
- The disconnect box next to the outdoor unit is switched on.
- The service switch near the furnace (it often looks like a light switch) is on, since the indoor blower needs power for the AC to work.
Dirty Air Filter and Frozen Coils
A clogged filter restricts airflow across the indoor coil. Without enough warm air passing over it, the coil can get so cold that moisture freezes on its surface. Eventually, ice blocks airflow completely and the AC blows warm air or none at all.
If you see ice on the copper refrigerant lines or around the indoor unit, turn the cooling off and set the fan to “on” to help it thaw. Replace the filter, then wait a few hours before restarting. If the ice comes back, the cause may be low refrigerant or a blower problem that needs professional AC repair.
Clogged or Blocked Outdoor Unit
The outdoor condenser releases the heat removed from your home. When its coil is covered in grass clippings, cottonwood seeds, leaves, or dirt, it cannot release heat properly. The system then runs longer, cools poorly, and may shut down on high pressure.
Turn off power at the disconnect, clear debris from around the unit, and gently rinse the fins from the inside out with a garden hose if you can do so safely. Avoid pressure washers, which can bend the delicate fins.
Failed Capacitor or Contactor
If the outdoor unit hums but the fan does not spin, or nothing happens at all when the thermostat calls for cooling, a failed capacitor or contactor is a likely suspect. These electrical parts help the compressor and fan motor start. Heat, age, and power surges from summer storms wear them out.
Capacitors store an electrical charge even when the power is off, so replacing them is a job for a trained technician. The good news is that this is usually one of the more affordable repairs.
Low Refrigerant From a Leak
Your air conditioner does not use up refrigerant the way a car uses gas. If the charge is low, there is a leak somewhere in the system. Common signs include warm air from the vents, ice on the lines, a hissing or bubbling sound, and an air conditioner not cooling the house even though it runs constantly. A technician can locate the leak, repair it, and recharge the system to the manufacturer's specifications.
Clogged Condensate Drain
Air conditioners remove a lot of moisture from humid summer air. That water drains away through a condensate line, often near the furnace. If algae or debris clog the line, water can back up into the drain pan. Many systems have a safety switch that shuts off cooling when the pan fills, which can leave you with the AC not working and a small puddle nearby.
When the Furnace Blower Is the Real Problem
Because the indoor blower lives inside your furnace, a failing blower motor, capacitor, or control board can stop both heating and cooling. If the outdoor unit is running but no air comes out of the vents, your AC is not working because of a problem inside the furnace – and the fix may be a furnace repair rather than an AC repair. This is one more reason to have the whole system checked when one part starts acting up – especially if the furnace is already showing several of the warning signs listed above.
What You Can Safely Do Before Calling for AC Repair
- Check the thermostat settings and batteries.
- Reset a tripped breaker once – if it trips again, leave it off and call for service.
- Replace a dirty air filter.
- Make sure all supply vents and return grilles are open and unblocked.
- Clear debris from around the outdoor unit.
- Turn off cooling and let any ice melt before restarting.
Avoid opening electrical panels, handling refrigerant, or bypassing safety switches. If the system still is not cooling after these checks, schedule professional AC repair. ENERGY STAR's heating and cooling maintenance checklist also shows which tasks are safe for homeowners.
AC Not Working During a Heat Wave?
A cooling failure on a 95-degree day with high humidity is more than an inconvenience. Upstairs bedrooms can become uncomfortably hot within hours, which is risky for infants, older adults, and pets. If your AC is not working during extreme heat, run through the quick checks above, then call for service right away rather than waiting for the weekend to pass.
While you wait, close blinds on sunny windows, use fans to move air, keep everyone in the lowest and coolest part of the house, and avoid using the oven or dryer. New Comfort Heating and Cooling offers 24/7 emergency service at (708) 717-9995.
How Regular Maintenance Prevents Breakdowns
Most of the problems on this page develop slowly. A capacitor weakens over several seasons, a coil gradually collects dirt, and a drain line slowly fills with algae. A spring tune-up catches these issues before they leave your AC not working on the first hot day. The same is true for fall furnace service, which can head off many emergency furnace repair calls in January.
Scheduling both visits each year keeps your whole system efficient, extends its life, and gives you time to plan for furnace replacement or AC upgrades on your own terms.
Repair or Replace Your Air Conditioner?
The same logic that applies to furnaces applies to air conditioners. If your AC is less than 10 years old and the repair is relatively minor, fixing it usually makes sense. If the system is 12–15 years old, uses R-22 refrigerant, needs a new compressor, or has needed several repairs in a short time, replacement may offer better long-term value.
If both your furnace and air conditioner are aging, replacing them together as a matched system can improve efficiency and reduce the total installation work. Our team can assess both systems and give you an honest recommendation, along with free estimates and financing options.
Frequently Asked Questions
Why is my AC running but not cooling the house?
The most common causes are a dirty filter, a clogged outdoor coil, low refrigerant, or a frozen indoor coil. Start by replacing the filter and checking the outdoor unit. If an air conditioner not cooling persists after that, call a technician.
Why is my AC not working after a power outage?
Power surges and outages can trip breakers or damage capacitors and control boards. Check the breaker and the outdoor disconnect. Many thermostats also need a few minutes to restart. If nothing happens, a component may have been damaged.
Can a dirty filter really stop my AC from working?
Yes. A badly clogged filter can freeze the coil, overheat the blower motor, and trigger safety controls that shut the system down. Checking the filter monthly during summer is one of the easiest ways to prevent problems.
How do I know if I need AC repair or a new system?
Age, repair cost, and repair history are the key factors. A minor AC repair on a system under 10 years old usually makes sense. If the unit is older, needs a major component, or keeps breaking down, a technician can help you compare repair costs with the long-term value of a new system.
Can my furnace cause my air conditioner to stop working?
Yes. In most homes, the AC relies on the furnace blower to move cool air through the ducts. A failed blower motor, capacitor, or control board in the furnace can stop cooling completely, even if the outdoor unit is fine.
Is it safe to keep running my AC if it is making noise?
It is better to turn it off and schedule service. Grinding, squealing, or banging noises often mean a failing motor or loose part, and continued operation can cause more damage.
Don’t wait for the freeze. If you checked off several items on this list, your furnace is trying to tell you something. Don't wait until the middle of a January night to listen.
Unsure if your system can handle another winter? Contact New Comfort Inc. today for an honest assessment.
