I manage purchasing for a regional food-service company — roughly $80,000 a year in orders across a dozen vendors. On paper, that makes me an office administrator. In practice, I'm the person who signs off on woozoo fans for the break room, a dewalt air compressor for the maintenance crew, and — increasingly — commercial refrigeration hardware that I had zero formal training to evaluate. I report to both operations and finance, and both have opinions about every purchase.
Here's my opinion after five years in this job: you don't need an engineering degree to buy refrigeration equipment well. You need the right questions. That's not a humble brag. I've made plenty of mistakes. But the worst purchases weren't the ones where I lacked technical knowledge. They were the ones where I didn't know what to ask.
The brands I keep buying from — bohn is the name that comes to mind — aren't the ones with the flashiest sales decks. They're the ones that treat education as part of the job.
Learning the Language Without Doing the Math
When I first saw "bohn heat transfer" on a spec sheet, I assumed it was marketing language. It's actually the whole job description: a heat exchanger exists to move heat efficiently. That sounds obvious, but understanding it changed how I read every quote since.
When I compared two evaporator quotations side by side — same nominal capacity, same price point, different fin spacing and defrost type — I finally understood why the details matter. Denser fins mean more surface area for heat exchange, but they also collect more dirt in a dusty environment. Electric defrost is simple to install; hot gas defrost is faster in the right application. Neither is "better." They're answers to different questions, and knowing which question you're asking is the whole game.
I still can't calculate a heat load. Probably never will. But I can now ask the questions that lead to a correct recommendation: What's the application environment? How much product turnover? What type of defrost does the system support? What's the voltage on site? The answers separate a quote that solves the problem from one that just fills the order.
The Condensing Unit Lesson
The purchase that changed my process most was a walk-in cooler. On hot afternoons, it would creep out of range, and our food safety manager was losing sleep over it. (Fairly — a warm cooler is a food safety issue, and health code compliance wasn't optional.)
The first contractor looked at the existing condenser and gave us a grim face (this was back in 2022, two years into my learning curve). "It's undersized," he said. "You need a bigger unit." The quote: $4,300. He also mentioned a "specialist" he could refer us to, which I now understand is what contractors say when they'd rather sell a project than solve a problem.
The second contractor — the one we still use — asked questions first. What size is the evaporator? Line set length? How many door openings per hour? What ambient temperatures does the building see in July? Then he explained why the bohn condensing unit he was quoting, with the same horsepower as the old one, would actually solve the problem.
I'm not a refrigeration mechanic. But I knew enough by then to compare the two proposals as solutions, not prices. The first recommended a bigger system for more money. The second matched the existing evaporator and corrected what was actually wrong: the original line set was too long, so the system lost capacity before the refrigerant ever reached the evaporator. The second proposal came to $2,900 installed, and it fixed the problem. The first proposal would have cost an extra $1,400, and I doubt the problem would have gone away.
I should also admit where I failed: I knew I should have asked for performance data on the original unit before calling anyone. The seasonal performance sheet the second contractor handed me — AHRI-certified data, which is the closest thing refrigeration equipment has to a truth label — made it obvious. The old unit was marginal at 90 degrees, and the line set made it worse. That's not engineering expertise. That's asking a vendor to show their work, and then actually reading what they show you.
"What Is Freezer Burn?" Is Not Just a Kitchen Question
Last summer, a team member asked me what freezer burn actually was. I assumed it was a food-science question — ice crystals on a forgotten steak. He shook his head. He meant in our cold storage room. Product was coming out of the freezer with frost buildup and dry, discolored patches on the surface.
Freezer burn in commercial storage is dehydration caused by air exposure and temperature fluctuation. The ice crystals people see at home are a symptom; in a facility, the same symptom often means the equipment isn't holding temperature under load. It's not a packaging failure, and it's not bad luck. It's the system running too many defrost cycles — in our case because it hadn't been serviced in too long.
That conversation stuck with me: a lot of equipment problems are actually knowledge problems. If we'd understood what freezer burn pointed to, we would have called a technician months earlier. Instead, we lost product that could have been saved.
This is the same mental model I use for buying equipment. The visible problem — frost, inconsistent temperatures, high power bills — is almost always downstream of a question you didn't think to ask. Learn the questions, and the problems get smaller.
Hiring a Contractor Isn't the Same as Checking Out
I hear the obvious objection: "That's why you hire a contractor. As an admin, you don't need to know this stuff."
I get it. We hire contractors for every installation. But I've seen what happens when a buyer hands over all judgment along with the purchase order. The contractor who recommends a bigger system might be right. Or they might be selling what they have in stock. The only way to tell the difference is to ask the same questions I've learned to ask, and to read the data sheet before signing anything.
I'm also aware that I'm now the rare admin buyer who watches evaporator coil videos at night. Honestly, most of what I've learned came from one distributor who took the time to teach, plus bohn's nomenclature guide — which, once you crack it, tells you more than the marketing page ever will. I don't have hard data on how many buyers like me exist, but based on my conversations at trade shows, the ones who do their homework are fewer than you'd think.
And the principle applies to small purchases too. I've ordered woozoo fans without a second thought — they're small, cheap, and the break room likes them. I've ordered a dewalt air compressor using the spec sheet our maintenance team handed me. But the purchases I stayed uninformed about are the ones that ended up on why-did-we-buy-this reports. The scale is different, but the principle is the same: know what you're asking for before you ask.
Bottom Line
You don't need to be a refrigeration engineer to buy refrigeration equipment. You need to know what questions to ask, why they matter, and who's willing to answer them. The sizing calculations, the electrical work, the refrigerant charging — that's what you hire experts for. Deciding whether the proposal actually solves the problem? That part is yours.
Education isn't a one-way street. The brand that educates me earns my trust. The contractor who educates me earns my repeat business. And the buyer who keeps learning — that's the buyer who stops making expensive mistakes.
That's me. I'm that buyer now, five years after taking over purchasing in 2020 and knowing absolutely nothing about refrigeration. If you'd told me back then that I'd be the one asking about fin spacing and line sets, I wouldn't have believed you. But here we are — the cold storage room holds temperature all summer, and the operations team comes to me with questions before they call anyone else.
