Aluminum AC Coil Explained: Pros, Cons, Cost vs Copper

OK, so speaking on aluminum AC coil – cause really, getting this can save you a boatload of money/grief in the future. You’re like, “What’s the deal with these aluminum coils? Are they any good, or am I just being ripped off?”

Here’s the short of it, up front: aluminum AC coils are played up as a money-saving upgrade to your air conditioning system for their good heat transfer and resistance to certain types of corrosion. But there’s a catch: they cost less to manufacture, and the real-world performance and longevity and be a hot topic among pros, some reporting a shorter lifespan than that offered by some older copper models.

Understanding AC Coils: The Heart of Your HVAC System

Consider your AC coil the lungs of your HVAC system – where everything is breathed in and breathed out when it comes to sucking in warm air and blowing cool relief into your home. This time, we are talking about the evaporator coil. This bad boy resides in the heart of your home, usually behind the door in the blower compartment of your furnace.

Its main gig? Heat transfer. It draws in the air that already exists in your space, absorbs the heat from that air, and redistributes that now-cooler air through your ducts. It’s not just because making your place chill plays a big part in dehumidifying your space, preventing mold and mildew, and just generally improving your home’s air quality. In this way, a coil that’s healthy means your AC isn’t working harder than it needs to — directly impacting energy efficiency, and even extending the lifespan of your entire HVAC system, literally. Less strain, less wear and tear — that’s the cheat code for longevity.

Aluminum Condensing Coils vs. Copper Condensing Coils: The Industry Debate

OK, so why is there so much fussing about aluminum versus copper? In the some AC installation game, it is frequently a matter of economics. From the perspective of the buyer — whether you’re a homeowner in Mesa or a business owner in Scottsdale — it’s straightforward: You want the best quality and didn’t want to pay for it, oh and right — you’re also buying the best installation. Manufacturers, for their part, are playing a different. looking a economics, How to steal more market share.

In the old days, most AC units used copper tubes and aluminum fins. Then there was General Electric in the 1970s. Their play? Partially reduce production cost by using coils made of aluminum tubes and aluminum fins. Back then, many homes could only dream of the luxury of AC. But then the market exploded, there were a lot of construction, and suddenly, everyone wanted air conditioning.

So, it’s not just a material choice; it’s an entire strategic chess match.

Advantages of Aluminum AC Coils

Don’t get us wrong, aluminum isn’t a cheap hack, it serves some serious benefits:

• Cost-to-Manufacture: First off, the cost-to-manufacture of aluminum coils is less expensive than copper. The end result is a reduced sticker price for you, the consumer, and that’s a big wallet win.
• Corrosion Resistance: Unlike copper, which can corrode and rust, aluminum coils do not. They also provide oxidation prevention and are claimed to be more micro-leak resistant. This can also beef up the life and efficiency of your system. Some will also tell you they help resist formicary corrosion, to which copper coils are susceptible.
• Lightweight: Aluminum is just physically lighter than copper. This might not seem like a big concern, but it could impact shipping, handling, and ultimately, overall unit weight, so there is a benefit to keep in mind.
• Efficiency of Heat Transfer: And don’t you forget how good aluminum is here. It is good at facilitating the transfer of heat; that’s what you need for a proper AC system. Copper has “better” heat transfer characteristics scientifically, but fins (usually aluminum) account for an incredible 65% -70% of the heat transferred in a coil. So, aluminum is certainly doing its share.

Cons of the aluminium AC coils

Okay, let’s talk about the less sexy stuff. Here’s where things get interesting, and where many HVAC pros begin to get a little hot under the collar (pun intended).

Strength, Reliability, and Durability Concerns:

• To answer scientifically, if I had same tubing dimensions, copper is stronger, more reliable, and more durable than aluminum. It’s just a tougher metal.
• However, here’s the catch: To be able to compete with aluminum on price, copper coil makers have sometimes gone too far and made the copper tubing walls too thin. So the reliability and robustness are “relative to the components that you actually used”. It’s like purchasing a tank but the steel is paper-thin. What’s the point?

Repair Difficulty:

• This is a big one. Some AC repair shops whine that leaks to the aluminum tubes are more difficult to repair than copper breaks. Some simply raise their hands and announce they’re “not repair-able in the field” — meaning more downtime for you and headaches (and costs) for the service center.
• Though the welding rigs on aluminum have improve and the process of repair is getting better and better, some techs still find brazing aluminum to be a royal pain. It’s a little less margin for error than copper.

Susceptible to Damage: The aluminum coils are susceptible to damage more than the copper coils for the most part. That’s just the way it is, baby.

Cleaning Difficulties: You may discover aluminum coils harder to clean than copper. If not handled properly, this can translate to blockages, decreased efficiency and higher energy bills.

Galvanic Action/Corrosion: When oxygen comes into contact with the condensing coil that is made up of aluminum and copper in a condensing system there is a risk of Live Leak. A few pros think of this as “not fixable”, though as stated, welding advances are slowly eating away at this problem.

Malleability: A copper-based loop is more malleable, or softer, requiring more material to construct a coil, sometimes twice or three times as much as aluminum. This in turn jacks up manufacturing costs.

More Slime Buildup and Odors: This one really, pardon the pun, sucks, but the truth is copper is anti-microbial and that’s just naturally better at keeping biofilm (the slimy stuff) at bay. On the other hand, aluminum is also neutral, so too much biofilm buildup and stink may appear faster. It’s as if your dish sponge were to sit out for too long.

Reduced Life (technician complaints) This is most likely the number one complaint we hear from the field. It seems that there are many technicians out there that are flatly stating that aluminum coils are getting half the lifespan as the copper coils, and leaks are surfacing as early as units between the years 2017 – 2022. Some even go as far to say that if you get 5 years out of an aluminum coil then you’re “on a roll”. It suggests a belief in “planned obsolescence,” at least in some minds.

Physical Flexibility: Aluminum isn’t as flexible (ductile) as copper. What does this mean for you? It has the potential to develop fractures at the joints in due course of time, particularly in the heat pump evaporator coils due to high pressure. Think of it the way you would a paperclip that you bend over and over again, until one day it just falls apart.

Microchannel Coils: These are a type of all-aluminum coils that are very much vilified. Technicians are reporting they’re not as durable, clog readily and don’t handle high head pressure, with at least one requesting repairs for “total blowouts” during pump-downs. It doesn’t exactly fill you with confidence, does it?

Aluminum vs. Copper: A Quick Comparison

To simplify the ongoing saga, here’s a quick rundown of the main points from the sources:

Installation and Maintenance Considerations for Aluminum Coils

So you have (or are interested in) an aluminum A/C coil. What now?

But for starters, professional installation is not optional. A properly installed evaporator coil can be a game-changer for your HVAC system’s efficiency and longevity. That involves controlling the environment the coils sit in, to avoid condensation issues and air leaks by ensuring that the coils are adequately sealed and insulated. Some contractors may lean toward installing “uncased” coils because it’s faster. However, as Logan Services says, they would rather a “cased” coil be installed, when feasible, in combination with the inside unit. It’s about finding that fit that is tighter than tight, like a bespoke suit, but for your AC.”

Next is maintenance is your best friend. Seriously, this isn’t optional. Keeping your aluminum coil clean is vital for efficient operation of the unit. Dirty or blocked coils are a shortcut to lower efficiency, greater power bills, and worse, possibly costly repairs or worst still, and entire system replacement. Blockages can cause ineffective cooling and can even cause the system to fail completely. During routine tune-ups, many AC companies do an insufficient job of cleaning coils, so hire a pro who really will go above and beyond, opening the case and using special cleaning fluids.

Indications To Replace Your Evaporator Coil

And even with the best care, coils don’t live forever. Here are some indicators that your aluminum AC coil might throwing in the towel:

• Odd Sounds: If you’re hearing strange rattling or other sounds from your AC, get professional help to take a look at it for signs of damage and low efficiency. It might be a sign your evaporator coil is misbehaving.
• You’re Having Trouble Getting Your Home to the Right Temperature: Is your AC running and running, but it never feels as cool as you want, or you’re finding hot areas? That’s a major tell. It feels like your ac is just doing its best but losing the war.
• Spike in Energy Bills: If it seems you’re burning through power, and yet, you haven’t changed your HVAC habits, a busted evaporator coil could be making your system go into overdrive, increasing your energy use.
• Old Age: Nothing is permanent, to put it bluntly. If the unit in question is a bit long in the tooth it could just be that it’s time for a new coil. As technicians have noted, certain aluminum coils were not designed to last, with leaks emerging in units as new as 2017-2022.

Selecting the Correct Coils for Your HVAC System

It can feel like threading a maze, to make the right choice, but here’s how to go at it:

• They’re the Same Size and Efficiency: This matters. Picking the right size: If you’re replacing a failed evaporator coil, you want to replace it with the same size you had before unless that size was wrong for your AC, heat pump, or furnace. You don’t want a small unit that can’t give you sufficient cooling because it will run and run and run, burning money and consuming energy. Don’t guess on this one.
• Material and Build Quality: You get what you pay for. Although copper has its advantages (heat conduction, not rusting), aluminium is lighter and often more affordable. Some of our clients request these, as a combination of copper tubes for heat transfer and aluminum fins gives you the best of both worlds. Get into the fine print but keep in mind that the “quality” of the copper (its thickness) is now different to allow for competing on price.
• Cost vs. Long-Term Savings and Warranty: It’s possible that that mittoon lead anchor pinializedfestival4you thicker coil could be more expensive at the time of purchase, but would save you in the long-run in electric bills and fewer repair costs on your heating unit. And by all means, verify that manufacturer’s warranty. A good warranty is akin to an insurance policy for your investment.
• Consult with the HVAC Pros: This is your ace in the hole. Experienced HVAC pros can help steer you through the morass of decisions, and help you choose components that make the most sense for you and your specific system and home. Don’t be afraid to ask tough questions on the pros and cons of materials, how long you can expect the work to last, and what warranties cover. Some even will carry all of the major brands and types of coils.

FAQ: Your Burning Questions Answered

Have more questions about AC coils that are aluminum? Let’s hit ’em.

Q: Are aluminum coils ALL that bad compared to copper? A: It’s not black and white, but a lot of technicians tell us modern aluminum coils in air conditioners can be problematic and may have a longer life expectancy if they become leaky compared with the meantime between leaks on the thicker copper coils. Although copper is scientifically better in certain ways, copper coil manufacturers have shaved down their tubing to tariff-fighting price pressure, complicating the direct comparison.

Q: Why did they switch to aluminum if copper is supposed to be better? A: It’s all straight economics, my friend. General Electric began the practice in the 1970s as a way to reduce production costs. And as AC took off, other manufacturers followed suit to keep up. It’s a step to make units more affordable, but there was a big discussion about the long term quality.

Q. Can you fix a leaking aluminum coil? A: It’s often debated. Some HVAC repair contractors consider repairing leaks in aluminum coils hard or “non-repairable” in the field replacing the whole coil. But improvements in welding rigs and repair methods have brought some technicians to the point that they can now repair aluminum coils. That’s based on the technician and the tools.

Q: Are aluminum coils responsible for poor air quality? A: Potentially, yes. Unlike copper, which is naturally antimicrobial, aluminum is neutral. What this means is that aluminum AC coils can potentially be more vulnerable to accumulating excess biofilm (slime buildup) that can potentially clog drains and cause odors if not maintained properly. It’s regular, thorough cleaning that is key here.

Q: How do I know if my AC coil is aluminum or copper? A: Generally, your HVAC technician can advise you when they visit for service. But if you’ve got an all-aluminum coil, that means both the tubes and fins are aluminum. Copper tubes with aluminum fins are what some older units, and some newer units, are made of. 

At the end of the day, whether you have an aluminum AC coil or another made of copper, the difference maker is how you care for it and who you trust to install and cover service. Keep it clean, keep it inspected and you’ll keep your cool.