Capital Coil & Air

05/05/2026

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Email from Capital Coil & Air Capital Coil & Air Product Line Condenser Coil Failing? Here’s Why Did you turn on your DX system only to find the condenser coil isn’t working? It may seem like a simple

03/04/2026

Free Measure My Coil App -Receive screen by screen guide on measuring HVAC coils -Enter and save your coil dimensions/selections -Use the app to take and save pictures of coils -Save project(s) to work on later, and/or send final selections through the CCA app to our sales team to review and price

03/03/2026

Why Cooling Coils Need to Be Replaced

In theory, properly engineered and maintained cooling coils should deliver 20+ years of service life. In practice, most coils are replaced prematurely. The root causes are typically operational neglect, environmental exposure, improper application, or design limitations. Below are the three primary drivers of early replacement, along with technical context.

1. Increased Air Resistance from Coil Plugging
Cooling Coils
Failure Mechanism:

Airborne contaminants (dust, pollen, fibers, grease aerosols) pe*****te beyond the fin surface and embed deep within the coil core. Once lodged between fins and tubes, they cannot be fully removed by routine air-side cleaning.

Primary Causes:

Poor filtration

Irregular filter replacement

Lack of annual coil cleaning

High-particulate environments

Performance Impact:

Increased air-side static pressure

Reduced airflow (CFM)

Decreased heat transfer

Reduced system capacity and efficiency

Plugged cooling coils often force the fan to operate outside design conditions, increasing energy consumption while lowering cooling output.

2. Freeze Damage
https://www.resideo.com/us/en/-/media/Resideo/Corporate/Media%20Images/Featured%20Articles/120121/cracked-pipe_850.jpg?h=567&hash=607EE03C7CC57A4AC0E0DCCC6025A398&rv=9d8b4e00150d48e49dbc73a3291c6451&w=850

Failure Mechanism:

Water trapped in coil tubes expands during freezing, generating internal pressures sufficient to rupture copper tubes.

Why It Happens (Even When Dormant in Winter):

Circuiting designs that prevent full drainage

Drain connections positioned above low tubes

Lack of glycol protection

broken return bends
Inadequate winterization procedures

Consequences:

Multiple hidden leaks

Thinned tube walls due to pressure expansion

Progressive failures after initial repair

High risk of recurring leaks

Once a coil experiences extensive freeze damage, repair becomes unreliable. The metallurgical integrity of the tubes is compromised, making replacement the only durable solution.

3. Corrosion
https://static.wixstatic.com/media/ea3647_d85a052e6f8a4b5ab1c1d0555c623a28~mv2.jpg/v1/fill/w_1000%2Ch_750%2Cal_c%2Cq_85%2Cusm_0.66_1.00_0.01/ea3647_d85a052e6f8a4b5ab1c1d0555c623a28~mv2.jpg
Corrosion occurs on both the air side and the fluid side, often simultaneously.
Air-Side Corrosion
Salt-laden atmospheres (coastal or industrial)

Hydrogen sulfides (e.g., wastewater treatment facilities)

Chemical exposure in manufacturing environments

Visual Indicator:

A white ring around the tube-to-fin interface. This indicates loss of mechanical bond and reduced thermal conductivity between tube and fin.

Effects:

Reduced heat transfer

Loss of tube/fin contact

Core blockage from corrosion byproducts

Elevated air pressure drop

Water/Refrigerant-Side Corrosion
Raw, untreated water

High mineral content

Improper water chemistry control

Internal corrosion weakens tube walls and leads to pinhole leaks, particularly in copper tubing exposed to aggressive water conditions.

Key Takeaway
Cooling coil replacement is common—but preventable. Most failures are not random; they are the result of design limitations, environmental exposure, or maintenance gaps. Replacing a coil without diagnosing the root cause often guarantees another premature failure.

If longevity, efficiency, and reliability matter, the solution isn’t just replacement—it’s engineered improvement.

01/20/2026

Need a 5 Day Quick-Ship

Email from Capital Coil & Air Capital Coil & Air Quick-Ship Program FREE MEASURE MY COIL APP Click Here To Request Free App Click Here To Update Coil Selection Software TESTIMONIALS Steam Distribut

12/02/2025

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Email from Capital Coil & Air Capital Coil & Air Product Line Condenser Coil Failing - Here’s probably why Did you recently turn on your DX system only to find your Condenser Coil is not working? Simp

11/04/2025

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Need A Replacement For A Bell & Gossett Heat Exchanger

Email from Capital Coil & Air Capital Coil & Air Product Line Need A Replacement For A Bell & Gossett Tube Bundle or Heat Exchanger Bell & Gossett tube bundle or heat exchanger fail on you? Capital C

09/10/2025

Learn the top 10 FAQs about fan coil units and their installations.
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Email from Capital Coil & Air CAPITAL COIL & AIR PRODUCT LINE Top 10 Fan Coil FAQ’s 1. A fan coil is among the easiest units to understand in the HVAC industry. Basically, there is a small forward cur

03/11/2025

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Email from Capital Coil & Air CAPITAL COIL & AIR PRODUCT LINE Top 10 Chilled Water Coil Facts Every Chilled Water Coil selection is about balance. Your coil selection balances the rows/fins versus the

02/18/2025

Guidelines For Air Velocities

Email from Capital Coil & Air Capital Coil & Air Product Line Guidelines For Air Velocities The height, length and resulting air velocities greatly figure in determining the size and performance of

01/14/2025

Now Offering R-454B Refrigerant for All DX Coils

Email from Capital Coil & Air Capital Coil & Air Product Line Now Offering R-454B Refrigerant for All DX Coils In keeping with most of the OEM’s in 2024, Capital Coil is helping everyone transition fr