Here is how the copper coil and aluminum coil look like:
Most manufacturers are starting to switch from using copper coils to aluminum alternative as condenser and evaporator coils for a number of reasons. Before you decide to purchase a new system with either copper or aluminum coils systems, it is good to have some knowledge of what you are setting yourself up for.
By tradition, copper is considered the better choice when it comes to the manufacture of evaporator and condenser coils. The reason behind this is its rate of heat transfer, its cost effectiveness, its flexibility and of course, the fact that copper line sets were made to join split systems. The cost of copper has however skyrocketed over the past few years, thus turning the tables in the manufacturing industry. Manufacturers are now looking into aluminum because it is cheaper and also boasts a number of the benefits that have been mentioned above for copper. The main difference is that Copper has about two times the conductivity that aluminum has when it comes to heat transfer.
Copper VS Aluminum Coils Simplified:
|Copper Tube & Fins||Aluminium Tube & Fins||Copper Tube & Aluminium Fins|
|Maintanence||Susceptible to formicary corrosion||Susceptible to mold and bacteria||Susceptible to formicary corrosion|
|Durability||Durable||Less durable||Less durable|
|Repair Difficulty||Normal||Need replacement||Hard|
Copper has superior heat transfer rate compared to aluminum as we talked above. That’s why you can always find a high SEER ratings for copper coils air conditioner/heat pump.
It is easy to repair all copper coils if damaged in the field whereas with aluminum, once damaged, it will require an entire coil alteration. Today’s copper tube and aluminum fin coils are not very repairable either. The copper is so thin that it is very difficult to braze.
Copper is susceptible to formicary corrosion (this however is not a big setback as long the coils are properly and regularly maintained), aluminum is susceptible to mold and bacteria. Anyone with a bacteria or mold problem should use a UV air cleaner within the ducts. This needs to be carried out by a trained professional.
Bad Trend for Copper (skimp)
Modern technology coupled with the cost of copper has forced manufacturers to skimp on the material. The import here is that thinner(and less efficient) coils have flooded the market. There is the perception that copper last longer than aluminum. This however might soon change due to the aforementioned scenario where manufacturers are using thinner and less stable strands.
Besides, the price of copper makes it more appealing to thieves. It is being targeted and sold later at a cheaper price in the market. If you use the material, ensures that the wires are well secured and this will discourage theft.
Be Wary of Hybird
While copper is used for line sets, fins are used for aluminum. When copper and aluminum are joined, mostly galvanic corrosion happens. Galvanic corrosion usually happens when two unlike metals are connected. With modern technology and great advancements, the concepts of joining unrelated metals have made aluminum an appealing choice for some.
Each metal has its own advantages that make it a suitable choice for evaporators and condensers. The downsides are also split evenly, so the aspect of choice really falls to the consumer. Looking at both the pros and cons of copper and aluminum, both coils are used according to the availability of space, the cost benefit when doing the installation as well as the maintenance. There are some equipment that will work well with aluminum and some that will best work with copper.
By the way, my personal priority is All Copper (no skimp) > All Aluminum > All Copper (skimp) > Copper Coil + Aluminum Fins. Only personal. If you have any questions and suggestion for this article, just drop a message below.