Galvanic corrosion
When copper and aluminum meet with moisture, an electrochemical reaction destroys the aluminum at every joint. CoilShield reverses this process by introducing a more active metal that corrodes instead of your coil.
Coil
Protect Your HVAC Coil Before It Fails
Your air conditioner is essential infrastructure. When your evaporator coil fails from corrosion, the entire system stops cooling. CoilShield uses proven cathodic protection to prevent that failure and extend equipment life by 10 or more years.
Why your coil is under constant attack
Your evaporator coil faces multiple corrosion threats simultaneously.
Most failures result from a combination of these factors.
Threat sequence
Subtle motion highlights one corrosion risk at a time.
Formicary corrosion
VOCs from new construction and spray foam insulation create acidic vapors that bore microscopic tunnels through copper tubing. The damage is invisible until the coil fails. CoilShield prevents the electrochemical conditions that allow it to start.
Acidic attack
Cleaning products and building materials form acids that eat through metal. Cathodic protection suppresses the electrochemical corrosion potential at the coil surface, reducing attack from acidic condensate.
Environmental stress
Humidity, temperature cycles, and repeated wet and dry conditions accelerate corrosion. CoilShield provides constant protection regardless of climate or how many hours your system runs.
Stop coil failure before it starts
Protect your system now with CoilShield and avoid emergency replacement costs later.
Buy nowCoilShield reference rail
Protection that keeps the story moving.
This section pins and shifts horizontally whenever the track has room to travel, while calmer stacked layouts keep the motion restrained.
No power required
Sacrificial anode systems work automatically with no power required. When condensate forms on the coil, the magnesium anode becomes the active electrode and corrodes instead.
Easy installation
Ask your technician at the next service visit. Installation takes about 30 minutes and does not involve disassembling the air handler, handling refrigerant, or modifying the system.
Continuous protection
Protection levels are highest when moisture is present on the coil surface, which is when electrochemical corrosion risk is highest. The system is self-regulating and requires no manual adjustment.
Coils that outlast the system
Coils under cathodic protection routinely outlast the rest of the HVAC system. Protect yours from the day it is installed and the single most expensive failure becomes one you never face.
Cathodic protection
Two centuries of proven science, protecting your coil.
In 1824, Sir Humphry Davy solved copper ship hull corrosion for the Royal Navy by attaching blocks of iron. The iron corroded instead of the copper. Two hundred years later, the same electrochemical principle protects your HVAC coils.
How protection works
One problem. Two solutions.
Galvanic corrosion is not a future risk. It is a process already underway every hour your system runs. CoilShield makes your coil the cathode, so corrosion attacks the replaceable anode instead.
- 01
Every coil has a built-in failure point
When copper and aluminum meet condensate, an electrochemical cell forms. Current flows. Aluminum corrodes. This happens every hour your system runs, from the day it is installed.
- 02
Your environment decides how fast
Salt air, VOCs, humidity, and agricultural ammonia each change the electrolyte conditions around the coil. A coil that lasts 15 years inland can fail in 5 years near the coast.
- 03
Two proven methods. Same electrochemistry.
Sacrificial anode for residential and light commercial: no power, no controls, annual replacement. ICCP for critical facilities: adjustable current, real-time verification, a decade of service.
- 04
Prevention costs less than one service call
Warranty covers the replacement coil. It does not cover the $850 to $2,400 in labor and refrigerant, or the two weeks without AC in July. CoilShield prevents the failure before it happens.
Two proven systems
Passive simplicity for homes. Active control for critical facilities.
Sacrificial anode: passive protection with no power required. Magnesium corrodes instead of your coil, replaced annually at the service visit. ICCP: active protection with adjustable current and real-time monitoring, built for commercial and industrial facilities where precise control is essential.
Sacrificial anode
Passive. No power required.
Magnesium corrodes instead of your coil. Replace the anode at your annual service visit. Ideal for residential and light commercial applications.
ICCP device
Active. Monitored. Adjustable.
A controller and reference electrode maintain optimal protection levels automatically. Built for commercial and industrial facilities where downtime is not acceptable.