- Learn the critical measurements needed for accurate coil replacement.
- Discover why DIY coil measurements often lead to costly mistakes.
- Get expert insights into how KCL ensures a perfect match — no retrofits, no headaches.
When your air conditioning system starts losing performance, making odd noises, or leaking refrigerant, chances are the coil needs attention. Replacing it isn’t as simple as ordering a new part — especially in commercial or institutional buildings where systems are custom-built or decades old.
If you’re considering replacing a coil in your A/C unit, accurate measurement is everything. And if you’re in Ontario, KCL can handle it for you — ensuring a perfect fit, the first time.
Let’s take a look at what goes into measuring an A/C replacement coil.
What You Need to Measure for an A/C Coil Replacement
1. Coil Dimensions
- Finned Height & Length
Measure only the active fin area — not the casing or mounting flanges.
- Casing Height, Length & Depth
Include the full metal frame that houses the coil. Casing depth corresponds to how many tube rows are stacked in the direction of airflow.
2. Number of Rows & Tube Configuration
- Rows
Count the rows of tubes front to back. More rows = deeper coil = greater capacity.
- Tube Diameter
Standard sizes include 3/8″, 1/2″, and 5/8″. Matching this exactly is critical for flow rates.
- Tube Pattern
The stagger (e.g., 60°, 90°) and spacing affects airflow and performance.
3. Fin Details
- Fins per Inch (FPI)
More fins increase surface area — and heat exchange — but can also affect static pressure.
- Fin Type/Material
Aluminum is common, but epoxy-coated or copper fins are used in harsh environments.
4. Connection Information
- Connection Size & Type
Measure outer diameter and note whether it’s sweat, threaded, or flange.
- Connection Location
Use the coil’s casing as a reference point and record how far each connection is from the top or bottom edge.
5. Airflow Direction
Is it vertical (up/down) or horizontal (side-to-side)? This affects how the coil is mounted and how it performs.
Why DIY Measurements Can Be Risky
Even the most experienced contractors can make honest mistakes when measuring coils — especially when dealing with tight clearances or aging equipment.
Common issues from DIY measurements:
- Coils that don’t fit the housing
- Mismatched connections
- Airflow problems from wrong row or fin configurations
- Delays and added costs due to modifications on-site
Bottom line? An incorrectly measured coil can bring your entire system to a halt.
Let KCL Handle the Measuring
We’ve seen every kind of A/C setup — from rooftop units in office towers to built-in systems in shopping centres and schools. Our team provides on-site measurement services to take the guesswork out of the process.
Here’s what we deliver:
- Accurate field measurements
- Custom-engineered replacements that match original specs
- Direct-from-manufacturer pricing with no middlemen
We don’t just sell coils. We make sure the replacement works without any retrofit — saving you time, labour, and frustration.
If your A/C system is due for a coil replacement, don’t measure it yourself — measure it right.
Contact KCL today to schedule a professional coil assessment and get a solution that fits the first time.