Aluminium vs Copper Fins: Which Coil Performs Better?

Most coils use copper tubes, but the fins can be aluminium or copper — and the choice affects cost, performance and durability.

Here's how to decide.

Aluminium fins: the standard choice

Aluminium fins are lighter and more economical, and they perform well in normal indoor and commercial environments. For most HVAC applications, copper-tube/aluminium-fin coils are the sensible default.

Copper fins: for tough environments

All-copper coils resist corrosion far better and edge out aluminium on conductivity. In coastal, marine, chemical or highly humid settings, copper-fin coils justify their premium by lasting much longer.

Galvanic corrosion consideration

Dissimilar metals in contact can accelerate corrosion in aggressive atmospheres. All-copper construction sidesteps this, which is one reason it's favoured for harsh duty.

Making the call

Choose aluminium fins for typical comfort cooling on a budget; choose copper fins where corrosion, longevity or maximum efficiency justify the cost. When unsure, describe your environment to the manufacturer.