If you’re like me, you didn’t get into this job to become an HVAC procurement specialist. You got the task because someone needed a quote for a McQuay water cooled chiller or a replacement hot water heater, and you happened to have a company credit card. I’ve been managing this kind of purchasing for about five years now, and I’ve made almost every mistake in the book. This checklist is what I use now to keep from repeating them.
Here are the 7 steps I follow every time I need to order a McQuay fan coil, a cooling fan, or anything related to the mechanical plant. This is for the admin or office manager who has to get it right the first time, because there’s no room in the budget for a do-over.
Step 1: Verify the Existing Equipment Model (Don’t Assume)
What to do: Go look at the nameplate. Take a photo with your phone.
When I first started, I thought a “McQuay chiller” was just a McQuay chiller. I ordered a replacement fan coil based on a verbal description from our building manager. It was wrong. The unit was a McQuay water cooled chiller with a specific refrigerant requirement that I didn’t catch. I had to eat the return shipping.
Today, I snap a picture of the model and serial number. I also check the voltage and refrigerant type. I’ve learned that “standard” isn’t standard. For a McQuay fan coil, you need to know if it’s a 2-pipe or 4-pipe system. For a cooling fan assembly, you need the exact blade pitch or motor specs. The nameplate never lies—your memory does.
Step 2: Ask the Vendor “What Do You Need From Me?”
What to do: Before sending a purchase order, call the vendor and ask what info they need to guarantee fit.
I used to just send a model number. Then I’d get a call back saying, “We need the controller type,” or “Is this for an R-22 or R-410A unit?” This always slowed things down.
Now, I start the conversation by asking: “I have a McQuy (I always say McQuay wrong—they don’t care) water cooled chiller that needs a new control board. What do you need from me to make sure I get the right part?” They usually ask for the compressor brand, circuit board revision, or refrigerant type. I get that info upfront. It saves a day of back-and-forth.
If you’re looking at a replacement hot water heater or heat pump water heater, ask if it’s a direct replacement or if you need new piping. That’s a question I forgot to ask once.
Step 3: Verify the Shipping Address for Heavy Equipment
What to do: Confirm the delivery location has a loading dock or forklift access.
A mistake I made: I ordered a new condenser fan motor for a roof unit. The vendor shipped it standard freight. The driver showed up at our reception desk with a pallet. We had no way to get it to the roof. I lost a whole afternoon.
For anything heavy—a chiller, a large fan coil unit, a water heater—ask the vendor if it ships on a pallet, what the liftgate options are, and if you need to schedule a delivery window. If you’re in a commercial building, the receiving dock might have limited hours. This is one of those boring details that will ruin your week if you skip it.
Step 4: Get the “Total Cost” Quote (Not Just the Unit Price)
What to do: Ask for a quote that includes shipping, handling, and any core charges.
I once got a great price on a McQuay compressor—$600 less than anyone else. I was thrilled until the invoice arrived and there was a $200 core charge and $175 in freight. The “cheap” option cost me more than the “expensive” one. Now I request a line-item quote.
When ordering a hot water heater or a cooling fan, I say: “Please quote the price with shipping to my zip code, and include any applicable core deposits or environmental fees.” If they won't do it, that's a red flag. Honest vendors will show you the math.
Step 5: Check the Lead Time (and Add a Buffer)
What to do: Ask for the actual lead time, not the “standard” one.
Last year, I ordered a replacement controller for a McQuay water cooled chiller. The salesperson said, “3 to 5 days,” which I took as gospel. It took 11 days. The AC was down the whole time. I now add a 50% buffer to any lead time they give me. If they say 3 days, I plan for 5. If they say 10, I plan for 15. This isn’t them trying to trick me—it’s just reality.
For something like a heat pump water heater (and I had to look up “what is a heat pump water heater” just six months ago when the boss asked me to get one), the lead time can be crazy long because they’re popular for tax credits. Don’t assume it’s in stock.
Step 6: Confirm Compatibility Before You Pay (The 24-Hour Rule)
What to do: Ask for a specification sheet or a “will-fit” guarantee in writing.
I almost ordered the wrong hot water heater element last quarter. The part number looked right, but I had a hunch. I called the vendor and asked them to confirm it was compatible with my unit. They checked and said, “Actually, that’s for the newer model.” Saved me a return.
If a vendor says “This fits your McQuay model,” I ask them to send me the spec sheet and confirm in writing. For HVAC gear, I also ask if they have a compatibility checker on their website. Many do. It takes two minutes and can save you an expensive mistake.
One more thing: if you’re buying a cooling fan for a computer room, make sure it’s an industrial fan, not a desk fan. That sounds obvious, but I have a story about that from my first year.
Step 7: Do a Quick Post-Order Check (Within 48 Hours)
What to do: Check the order status and receipt acknowledgment within 2 business days.
I placed an order for a chiller part on a Friday. The following Thursday, my technician asked where it was. I checked my email—the order had been flagged as “declined” by the vendor’s credit check system because I’d used the wrong billing code. No one told me. Now, I always send a quick email 24 to 48 hours after ordering: “Just confirming receipt of order number X. What’s the current ETA?”
This doesn’t make me look pushy; it makes me look organized. And it catches problems while there’s still time to fix them.
A Final Thought on What You Don’t Need
This checklist isn’t for everyone. If you’re a mechanical contractor who does this daily, you probably have your own system. But if you’re the admin who got asked to source a McQuay fan coil or replace a hot water heater because “you’re good with spreadsheets,” these steps are for you. I wish I’d had them when I started in 2020.
Prices as of early 2025 for online HVAC parts vendors vary widely—a basic fan coil controller might run $150-$400 depending on controller type (verify current pricing with vendor).
Most of my early mistakes came from assuming things were simple. They’re not. But a checklist makes them manageable.
