Gardner Denver VS45-70A Air Compressor: 7 Cost Questions, Answered Straight

If you've priced out a Gardner Denver VS45-70A, you know the number can make you blink. But from where I sit—six years of managing a procurement budget that's passed $180,000 in compressors, blowers, dryers, and replacement parts—the quoted price is the least interesting part of the deal.

The questions people actually ask me are rarely about brochure specs. Here's what usually comes up, and my honest answers:

• What is the VS45-70A?
• What does it really cost, end to end?
• Blower or compressor—which do you need?
• Kerosene heater AND compressor in a garage?
• Where to buy parts (and where not to)
• Used or new?
• When is variable speed a waste?

What is a Gardner Denver VS45-70A air compressor?

It's a variable-speed rotary screw compressor from Gardner Denver's VS series. The "45-70" in the model name tells you the nominal horsepower band—roughly 45 to 70 HP depending on configuration. The "A" in the suffix, if I remember correctly, has to do with the enclosure and package layout. For a buyer, the part that matters is "variable speed."

Here's what you need to know: this is an industrial machine, not a garage toy. If you're one person in a workshop with a few air tools, you don't need this class of compressor. You'd be paying for capacity you'll never load, plus the maintenance costs that come with a bigger unit. But if you're feeding CNC machines, assembly stations, or a packaging line across a shift, the VS series earns its keep.

The variable-speed drive is the whole game now. Our daily demand swings from about 40% to 85% of rated capacity depending on what's running. A fixed-speed unit would cycle on and off—or worse, run unloaded—and every minute of that is wasted energy. The VS45-70A matches output to demand. Sounds basic, but it took the industry a long time to get right.

What does a VS45-70A really cost, end to end?

The first quote I got in this class was $47,000 in Q3 2024. The purchase order we signed was $44,500. The final cost, installed and producing air, was about $61,000.

That gap is what catches people. The compressor unit itself is usually 60–70% of the total installed cost—or rather, that's been true in every quote I've compared. The rest comes from:

• Electrical work—three-phase power, disconnect, VFD hookup. We paid $4,200 because the panel was 80 feet away.
• Foundation or vibration isolation mounts.
• Piping from the compressor to the distribution header—our install ran 60 feet of copper plus valves and fittings.
• Air treatment: a refrigerated dryer, coalescing filters, and condensate management. Non-negotiable if you care about tool life or paint quality. (If you need a spec to reference, ISO 8573-1 Class 1.4.1 is our typical target.)
• Commissioning by the authorized tech who sets up the controller.

It's tempting to think you can just compare unit prices. But identical-looking specs from different vendors can produce wildly different outcomes—one quote I got included the dryer and starter, the other didn't. That's a scope difference, not a price difference.

Even after we picked the vendor, I kept second-guessing. What if the install ran over? What if the savings didn't show up on the electric bill? It took about a month of logged data before I relaxed. The savings were real—energy is usually the biggest line item in a compressor's 10-year cost, far bigger than the purchase price—but I wasn't sure until I saw the numbers.

Pricing data above is as of Q3 2024. Verify current numbers with your authorized Gardner Denver distributor, because rates have moved around since.

Wait—aren't Gardner Denver blowers the same thing?

No, and people mix these up all the time. A compressor delivers air at high pressure. A blower delivers a large volume of air at low pressure—typically 1 to 15 PSI. Put another way: a compressor gives you pressure, a blower gives you volume. Different physics, different jobs.

Gardner Denver makes both. Their positive displacement blowers show up everywhere: wastewater aeration, pneumatic conveying, material handling. If you need to move air or bulk material steadily, you need a blower. If you need to drive tools or actuators, you need a compressor. Using one for the other job is an expensive mistake.

Don't buy a blower on unit price, because energy is the real cost. Blowers running aeration duty are on 24/7. In 2023, I replaced an older fixed-speed unit with a variable-speed blower, and the projected electricity payback was roughly 14 months. Five years ago, that margin wasn't there. The blower market has changed a lot since 2020—what was premium is now standard. But the fundamentals haven't changed: size to your actual system curve, not to the datasheet.

I'm setting up a heated garage. Do I need a kerosene heater AND a compressor?

They're separate systems. I know that sounds obvious, but I've genuinely had people ask whether their garage heater can "blow air into tools." No. A heater warms the space. A compressor stores energy in compressed air. You need both.

One thing I'll be blunt about: we stopped using kerosene heaters in our compressor room after the 2023 winter. A combustion heater puts water vapor and carbon monoxide into the air, and the compressor intake happily sucks that in. The extra moisture load made our dryer work overtime, and filter elements looked noticeably worse within a month. If your kerosene heater shares a room with your compressor, seriously consider an electric or infrared garage heater instead. It costs more to run, but it's easier on the equipment and safer for your lungs.

For the heater itself, electric unit heaters or wall-mounted infrared units work fine in a shop. Respect the clearance requirements and keep airflow away from service points and air intakes. Boring, but it saves headaches.

Where should I buy parts—and where should I NOT?

If you landed here searching for where to buy glass oil burner pipe for a kerosene heater, that's a different supplier you're after. That's a consumer appliance part, and a specialty appliance parts house is the right place—not an industrial compressor distributor.

For actual Gardner Denver parts, my rule after getting burned once is: buy genuine for anything that touches the compression core—air filters, oil filters, separator elements, and the manufacturer-specified lubricant. Aftermarket filters can save 30–40% on the invoice, but I've seen higher pressure drop across aftermarket elements, and that costs you in energy every hour they're installed. That's a hidden cost, not a saving.

Non-critical items like gaskets, seals, and generic hardware? Source those anywhere. But keep the core consumables genuine, from an authorized distributor. If you find a deal on "new, still boxed" elements from someone who isn't authorized to sell Gardner Denver parts, walk away. I've seen counterfeit separator elements cause oil carryover that cost more to clean up than the genuine part would have cost over ten years.

Should I buy a used VS45-70A instead of new?

Sometimes. I've bought used equipment, and I'll do it again. But I learned the hard way that the risk isn't the machine—it's the hidden condition.

In 2022, I bought a used 40 HP unit where the seller swore the airend was "recently serviced." It wasn't. The rebuild quote came in at $9,500. Add the inspection fee, freight, and lost production during the swap, and that used compressor cost me about 80% of what a new one would have—with zero warranty.

So here's the rule I use now. A used compressor makes sense if:

• You're on a tight budget and you know exactly what you're looking at—not just what the seller is telling you.
• You have a compressor tech who can do a real inspection, including bearing readings and oil analysis, before you commit.
• You budget for a rebuild regardless of what the seller claims. If the machine checks out, you got a bargain. If not, you've already planned for it.

For a variable-speed model specifically, check the drive. In late 2024, I was quoted more than $6,000 for a replacement VFD on a comparable unit. The compressor might be rock solid, but a tired drive can kill the deal fast.

When should you NOT buy the variable-speed version?

If your operation runs at 95%+ load, consistently, with no demand swings, a fixed-speed compressor with proper storage is going to serve you fine for less money. Variable speed isn't better in the abstract. It's better when your demand fluctuates, which is true for most of us—but not all of us.

I got this wrong myself the first time. I bought variable speed because the sales rep said it was "the modern choice," and I paid an 18% premium for a feature that, in that application, saved us maybe 3% in energy. That's not a failure of the technology. It's a failure of sizing. Match the tech to the load profile, not to the label.

That said, I won't buy another fixed-speed for our main system. Our demand swings too much, and what was best practice in 2020 won't necessarily hold in 2026. But if you're a single-shift operation running wide open, don't let anyone upsell you on a VFD you can't actually load.