- Spot the early warning signs of a failing air conditioning coil.
- Learn why timely replacement prevents larger (and more expensive) issues.
- Discover how KCL helps commercial and institutional buildings get back to comfort — fast.
When your air conditioner isn’t cooling like it used to, it’s easy to assume the whole system is going. But in many cases, the real issue is the coil — and replacing it can restore performance without a full unit swap.
Still, identifying the problem early is key. So how do you know when it’s time to replace your A/C coil? Let’s break it down.
What Does an A/C Coil Do, Exactly?
The coil in your air conditioning system is responsible for transferring heat. In simple terms, it either absorbs heat (evaporator coil) or releases it (condenser coil), depending on the system design.
If the coil is compromised — by corrosion, blockage, or mechanical failure — your entire system suffers.
Top Signs Your A/C Coil Needs Replacing
1. Weak or Warm Airflow
If the air coming out of vents is not as cold as it should be, the evaporator coil may be dirty, frozen, or failing.
2. System Runs Constantly
If your A/C seems to be running around the clock without reaching the thermostat setpoint, the coil may be reducing heat transfer efficiency.
3. Unusual Noises
Bubbling, hissing, or banging sounds? That could indicate refrigerant leaks or pressure issues tied to a compromised coil.
4. Ice Formation on the Coil
Ice buildup on the evaporator coil is a classic sign. It means the coil isn’t properly exchanging heat — often due to a refrigerant problem or poor airflow.
5. Visible Corrosion or Leaks
Any sign of rust, greenish buildup, or oil residue on the coil suggests refrigerant leakage — a sure sign the coil may be at the end of its life.
6. Climbing Energy Bills
An underperforming coil forces the system to work harder, drawing more power for less cooling. If your bills are spiking, the coil could be a hidden cause.
Why Commercial Buildings Should Act Quickly
In large facilities like schools, malls, or transit stations, a failing coil can affect not just comfort — but operations, safety, and energy costs.
Waiting too long can lead to:
- System breakdowns during peak demand
- Moisture problems or poor air quality
- Full-unit replacement when only a coil swap was needed
For facility managers and building operators, catching coil issues early is key to keeping downtime (and repair budgets) under control.
Should You Repair or Replace the Coil?
Here’s a quick rule of thumb:
- Repair if it’s a minor issue (like a dirty coil or loose fitting).
- Replace if the coil is leaking, corroded, or more than 10 years old.
That said, diagnosing the true issue isn’t always straightforward. That’s why a professional inspection is essential — and why KCL offers measurement and replacement support across Ontario.
How KCL Makes Coil Replacement Easy
If you’ve confirmed your A/C coil needs replacing — or suspect it might — KCL can handle the hard part. We offer:
- On-site coil measurement and inspection
- Custom-made coils built to match your exact unit
- No-retrofit replacements designed to drop in without modifications
- Direct-from-manufacturer pricing to keep costs under control
We’ve helped replace failing coils in office towers, c-stores, universities, and transportation hubs — all with fast turnaround and precision-matching.
If your building’s A/C is underperforming, don’t wait for a full system failure.
Contact KCL today to request a coil inspection or get a quote for a replacement. We’ll help you keep things cool — efficiently and affordably.
Frequently Asked Questions
Can I clean a coil instead of replacing it?
Yes — but only if dirt or debris is the issue. Professional coil cleaning can restore airflow and performance in many cases. However, if the coil is leaking, corroded, or physically damaged, cleaning won’t fix the root problem.
How long does it take to replace an A/C coil?
On average, the installation itself takes 4–8 hours, depending on access and system design. However, the real variable is sourcing the right replacement.
With KCL’s made-to-measure approach, we typically deliver custom-matched coils within 2 to 4 weeks — faster with expedited options.
Can I replace just the coil instead of the whole unit?
Yes — and often you should. Full unit replacement is more expensive and may not be necessary. If your system is still relatively young and the rest is in good shape, replacing only the coil is more cost-effective.
How do I know if it’s the coil or something else?
That’s where a professional diagnosis matters. Symptoms like poor airflow or high bills can be caused by several factors — coils, fans, thermostats, or even dirty ductwork. A trained technician will use a combination of tools and experience to find the true cause.