The market’s response was immediate and chaotic. For months, contractors and wholesalers scrambled to stockpile copper, bracing for what many feared would be the mother of all shortages. Now, with refined copper exempted, those stockpiles have instantly lost value, and companies heavily exposed to fabricated copper products face new uncertainty. For some, it’s a sigh of relief; for others, especially those holding excess inventory or reliant on pipes and tubes, the whiplash is just beginning.

Copper’s wild ride is back in the headlines, but for the sheet metal and HVAC industries, the whiplash isn’t just about price charts – it’s about survival, adaptation, and reading political tea leaves with a magnifying glass. If you blinked, you missed $5 copper’s return, its crash, and now its latest rerun: a 50% tariff from the White House that has turned an already volatile market inside out.

Back in March, I wrote about copper’s "second price shock," warning of tariffs and a supply chain stampede. That panic was almost self-fulfilling – prices spiked, HVAC and electrical contractors scrambled to stockpile, and then, as quickly as it started, copper collapsed below $4 a pound. Nearly 500,000 tons of copper hit U.S. ports in a single month, more than seven times the norm, as everyone tried to get in before new costs hit.

Fast forward to August, and the fallout from President Trump’s 50% copper tariff is no longer theoretical—but it’s not what anyone expected. The White House shocked the market by exempting refined copper metal from the new tariff, applying the 50% levy only to semi-finished copper products like pipes, wires, rods, and tubes. The result: after months of panic buying and historic price spikes, copper prices collapsed by nearly 20% in a single day, plunging from above $5.70 a pound to around $4.60.

The earlier surge in imports now looks like a costly gamble, as contractors and manufacturers who rushed to stockpile face a very different market reality. While U.S. buyers of fabricated copper products will still be hit hard, the industry’s worst fears of an across-the-board shortage have eased—at least for now. But volatility is the new normal, and the only certainty is more uncertainty ahead.

The substitution effect is suddenly more than a useful strategy – it's vital triage. Five years of price escalation, even before tariffs, forced a rethink of old habits. “Copper’s workability has always made it the standard, but alternatives like aluminum and nickel-coated steel are coming up fast,” as I reported in March. Duro Dyne’s Duro-Line, for example, is being specified for line sets and evaporator coils, boasting higher operating pressures and better corrosion resistance than copper, while major names like Trane and Lennox are prepping for broader aluminum use in external HVAC units. Bosch, meanwhile, has already ditched copper for aluminum in many of its heat pumps and air handlers.

Heragu echoed this shift, saying, “There are substitutes – aluminum, composites, even 3D-printed parts. For pipes, PEX is already common in construction. The bigger thing is the slump in demand, and the fact that buyers stockpiled ahead of time.” It’s become clear that this isn’t just a blip. A substitution effect brought on in part because of copper’s 75% rise in cost over 5 years, as my original reporting put it, has now become the new normal.

For sheet metal contractors, the stakes are especially high. Stan Kolbe at SMACNA had warned, “Adding copper to the growing list of highly tariffed items is just a price spike most hoped to see delayed or dropped altogether.” The data backs him up: U.S. copper imports hit $17 billion last year, and now, with tariffs biting, the industry is paying near world-high prices for a material essential to HVAC line sets, evaporator coils, and electrical wiring.

Behind the headlines is a simple supply math problem: the United States produces just over half the refined copper it consumes each year, and more than two-thirds of that is mined in Arizona. It’s not for lack of resources – Arizona is home to one of the largest untapped copper deposits in the world – but the development of a massive new mine there has been stalled for more than a decade, thanks to environmental reviews, permitting battles, and shifting political winds. So while the White House frames the new tariffs as a move to counter China’s dominance in global copper, the reality is more complicated. Nearly all of America’s refined copper imports – just shy of 1 million metric tons annually – come from the Americas, with Chile, Canada, and Peru accounting for more than 90% of the total, according to the United States Geological Survey.

The global context is even more tangled. China dominates copper refining, but relies heavily on ore mined in Latin America. Chinese investment in the Democratic Republic of the Congo has made the DRC the world’s second-largest copper miner, leapfrogging Peru. Meanwhile, the U.S. has only two primary copper smelters left in operation, making it difficult to scale up domestic refining in the near term.

So as the sheet metal and HVAC sectors brace for higher costs, the underlying supply dynamics haven’t changed. A stalled mine in Arizona isn’t going to save the industry. And as Heragu put it, “There may not be that much increase in U.S. production. Environmental and regulatory hurdles mean it could be years before anything changes meaningfully.” For now, the U.S. remains a net importer, dependent on a handful of allies for the copper that keeps HVAC systems, construction, and the electrical grid running.

Steel, meanwhile, is in its own holding pattern – tariffs remain, and global overcapacity means prices haven’t jumped the way copper has. But the uncertainty is stifling, especially for automakers and construction firms. “Imagine an automobile company holding back on purchases because they don’t know where things are headed. That shows up down the chain – in suppliers, in labor, and in the broader economy,” Heragu said, noting the wait-and-see game keeps a lid on prices only temporarily.

HVAC Caught in Crossfire

Copper is just one front in a much broader trade war, with copper now falling under the same Section 232 authority that’s already turned steel and aluminum into political footballs. President Trump isn’t stopping at copper – he’s threatening to impose additional Section 232 tariffs on seven other sectors, including pharmaceuticals, semiconductors, aircraft and jet engines, lumber, trucks, and critical minerals, with new tariff letters sent to Japan, South Korea, and a grab-bag of countries from South Africa to Malaysia and Laos. The numbers are dizzying: 25 to 50 percent tariffs for some, nearly 50 percent for copper, and a moving deadline that has now arrived. These threats are part of a much larger strategy, with reciprocal tariffs and trade deal brinkmanship cranking up the uncertainty for U.S. manufacturers and their global suppliers.

Heragu doesn’t mince words about the impact. “It’s kind of hard to recognize the seriousness of it. Anyone for one second believes these numbers will stick? There’s talk of 50% tariffs, but the market thinks it’ll end up closer to 10%.” He points out that this constant shifting landscape makes planning nearly impossible. “There’s a lot of noise, but businesses are waiting for the real number. Until then, it’s just more uncertainty.”

He also notes the ripple effect for supply chains and labor. “Imagine an automobile company that’s kind of holding back on purchase of larger volumes of steel because they don't know where things are headed. That ends up showing in tier two, tier three suppliers, in terms of the demand of these major companies from them and therefore their labor usage, and what the labor market is going to face because of all of this.” Now that August is here, the industry is watching closely for when the effects finally show up in real numbers—and maybe some real action.

The industry is looking at not only higher input costs but a future where substitution, sourcing, and scheduling must all be done with an eye on Washington’s next move.

Timeline: The Copper and HVAC Tariff Drama

• March 2025: Copper rallies, then collapses as buyers front–load imports.
• July 2025: Trump announces a 50% copper tariff effective August 1; U.S. premiums soar, imports slow, and suppliers brace for shortages.
• August 2025: Tariff is in effect—but with refined copper metal exempted, prices crash nearly 20%. Industry braces for ongoing volatility, with new winners and losers emerging overnight.

The only short-term certainty is more uncertainty. “There’s a lot of noise, but businesses are waiting for the real number. Until then, it’s just more uncertainty," Heragu said, concluding "every time you think things are beginning to settle down, there's news."

The copper drama now enters a new phase. While some breathing room has returned for sheet metal and HVAC contractors, volatility and policy uncertainty remain. Many are left asking: what happens to all that expensive inventory, and will fabricated copper products be the next flashpoint in Washington’s tariff wars? As one industry veteran put it this week, “Just when you think you’ve got it figured out, the rules change again.”