Why I Now Ask 'What's NOT Included' Before Asking the Price

Last November, I got an email from our procurement team that made me feel uneasy. They’d found a quote for a new ammonia screw compressor package that was roughly 18% below our usual budget. On paper, the specs matched. The brand was reputable enough. The lead time was three weeks shorter than what we normally expect.

Normally, that’d be a win. But I’ve been in quality review long enough—going on six years now—to know that when a deal looks too clean, there’s usually a mess waiting somewhere.

I’m not a procurement specialist, so I can’t speak to supplier negotiations or volume discounts. What I can tell you from a quality manager’s perspective is this: the gap between a quoted spec and the delivered reality can be a lot wider than most people expect.

The low bid that wasn’t

The compressor package we needed was for a greenfield cold storage facility in the Midlands. Capacity, refrigerant type, control panel specification—everything was clearly defined in our RFQ. The supplier with the low bid, let’s call them Vendor A, confirmed they could meet all requirements. They even threw in “free expedited shipping” as a sweetener.

I decided to run a quick audit on their proposal. Nothing fancy—just a checklist of items that are often treated as “standard” but actually aren’t. That’s when the cracks started to show.

First, the oil separator package. Our spec called for a specific make and model known for high-efficiency separation in ammonia systems. Vendor A had quoted a generic separator with no manufacturer listed. When I asked for details, they said it was “equivalent.” I asked for the datasheet. They didn’t have one ready.

Second, the control system. Our RFQ specified a certain PLC brand and communication protocol. Vendor A quoted a different brand with a protocol converter. When I flagged it, they said it would work the same. Maybe it would. But would it integrate with our existing monitoring system without extra programming? They couldn’t guarantee it.

Third, the cooling tower interface. Our design required a specific water temperature range to match our existing cooling tower capacity. Vendor A’s compressor selection assumed a different range. That meant either the tower would need to be oversized—costing us more—or the compressor wouldn’t perform as expected.

It’s tempting to think you can just compare unit prices on compressor packages. But identical base specs from different vendors can result in wildly different outcomes when you account for ancillary components and integration requirements.

The paperwork that saved us

I compiled all these discrepancies into a simple table—one sheet, three columns: “Specified,” “Quoted,” “Gap.” I sent it to the procurement team with a recommendation: don’t reject Vendor A outright, but ask them to requote with exact compliance to every line item.

Two things happened. First, Vendor A’s revised quote was only 6% below our budget, not 18%. The “free” expedited shipping was no longer included. The generic separator was replaced with the specified model at a premium. The control system upgrade added cost. Suddenly, the saving didn’t look so impressive.

Second, our usual supplier—a GEA distributor we’d worked with before—submitted a quote that was actually 2% higher than the revised Vendor A quote. But their proposal included something Vendor A’s didn’t: a full breakdown of every component, with datasheets attached, and a written commitment that all items would meet or exceed the RFQ spec. No ambiguity. No “equivalent” substitutions. No hidden integration costs.

I ran a blind comparison test with our engineering team: same compressor package spec, Vendor A’s revised quote vs. GEA’s quote. Five engineers reviewed both. Four of them said the GEA proposal looked “more professional” without knowing which was which. The one who didn’t said he “couldn’t tell.” On a £78,000 project, the price difference was £1,560. That’s about 2% of the total. For measurably clearer specifications and fewer integration risks.

What the paper trail taught me

The job went to GEA. The compressor was delivered on schedule. The installation went smoothly—no surprises during commissioning. But the real lesson, for me, wasn’t about that one order. It was about how we evaluate vendors going forward.

Here’s what I now do differently:

• I ask for component-level pricing. Not just a package price, but a line-by-line breakdown. If they can’t or won’t provide it, that’s a red flag.
• I check for exclusions. Every quote should list what’s NOT included. The vendor who lists all fees upfront—even if the total looks higher—usually costs less in the end.
• I verify integration at the quotation stage. A compressor that works perfectly in isolation might cause problems when it’s tied into an existing system. Getting that clarified early avoids expensive retrofits.

I’m not saying every low bid is a trap. But in my experience, the difference between a good deal and a costly mistake often comes down to transparency—not price. When a vendor shows you everything up front, they’re not just quoting a product; they’re building trust.

That’s worth paying for.