When the phone rings and it's a customer with a frozen coil emergency, I've got two choices to offer. One is a Bohn freezer unit. The other is a snow blower.
I'm not joking. For a few years, I was the guy who'd show up with a shovel and a snow blower to clear ice off a coil. It worked. For a day or two. Then the problem came back, worse, because now there's physical damage to the fins. After the third time I had to chip ice off a coil in a -10°F walk-in, I started asking a different question. Not "how do I fix this," but "what should I have installed in the first place?" That's the comparison I want to walk through here.
What We're Comparing
We're comparing two approaches to cold storage refrigeration: the modern, efficient Bohn system, and the reactive, manual approach of dealing with problems after they happen. The reality is that many operators end up owning a snow blower because their freezer system is undersized, poorly maintained, or both. I've been there. Let's look at the key dimensions where the differences show up.
Cost: Upfront vs. the Hidden Kind
This is the one that trips everyone up, including me. A Bohn evaporator model for a medium-sized walk-in might run you between $2,500 and $4,500, plus installation. That looks expensive when you're staring at a budget. A snow blower? $500. Maybe $800 for a good one.
Here's what I didn't account for: the cost of the snow blower is just the beginning. Every time the coil freezes, you lose product. You lose cooling efficiency—the compressor runs longer, the electric meter spins faster. You lose time. In September 2022, I spent a week of 12-hour shifts clearing ice from a single 20x30 freezer chest because the unit was mismatched for the load. That was $3,200 in overtime and lost productivity. The Bohn unit they finally installed cost $3,800 and solved the problem in one afternoon.
"The most frustrating part of this comparison: the expensive choice is actually the cheaper one in the long run. But nobody tells you that upfront."
The conclusion here is counterintuitive: if you take a 3-year view, the Bohn unit is almost always cheaper. The snow blower is a recurring cost disguised as a one-time purchase.
Cooling Performance & Stability
Now let's talk about what actually happens inside the box. A properly selected Bohn freezer unit maintains a consistent temperature. It cycles on and off based on demand. The coil stays above freezing, so moisture doesn't accumulate and freeze solid.
A unit that's undersized? It runs constantly. The coil gets colder and colder. Frost builds. You eventually lose control. This is where the question "can mold grow in the freezer" comes up. The answer is yes—if the unit is cycling too frequently due to frost buildup, temperatures fluctuate, condensation happens, and mold finds a home.
I once had a customer who was convinced all freezers get moldy. They'd scrape and clean every month. When I finally convinced them to let me check the Bohn evaporator models specification against their actual load, we found they were running a unit rated for 8,000 BTU on a space that needed 14,000 BTU. The unit was struggling, the coil was frosting, and the temperature was swinging +/- 8°F. We swapped to the correct Bohn evaporator, and the mold problem went away. The temperature variance dropped to +/- 1.5°F.
Dimension conclusion: The Bohn unit, correctly sized, gives you stable, predictable cooling. The alternative gives you bands-aids and lost product.
Maintenance & Reliability
This is where the efficiency viewpoint really comes into its own. A Bohn freezer unit with proper installation requires quarterly checks—clean the coil, check the fans, verify defrost cycles. That's about it. I've had Bohn units running 8 years with zero major issues.
The snow blower approach? It's daily maintenance. You're in the freezer every morning chipping ice. You're replacing gaskets because the constant moisture ruins them. You're changing fan motors because they ice up. The operational friction is enormous.
Switching to a digital control system on a Bohn unit cut our emergency call frequency from monthly to once every 18 months. But I get why people resist—"digital efficiency" sounds like a buzzword. It's not. It's a $200 controller that tells you exactly when the coil needs defrosting based on real conditions, not a timer.
Dimension conclusion: The Bohn system reduces maintenance from a daily chore to a quarterly review. The snow blower is a full-time job.
When to Choose Each
This isn't an absolute verdict. There are scenarios where a snow blower makes sense:
- Temporary or emergency situations: A backup freezer chest that's only used during peak season? Maybe a manual defrost is acceptable.
- Extreme budget constraints: If you simply cannot afford the upgrade today, a snow blower is a short-term stopgap. But understand it's a stopgap, not a solution.
- Old equipment awaiting replacement: If the compressor is on its last legs anyway, it might not be worth the investment.
But for any permanent cold storage installation? A Bohn freezer unit is the right call. The initial cost is higher, but the total cost of ownership over 3-5 years is lower. The product quality is better. The hassle is minimal. I've personally made the mistake of choosing the cheap route and paying for it in time and frustration. In hindsight, I should have pushed back on the budget and insisted on the correct Bhn unit from day one.
Take this with a grain of salt—I'm just one guy who's made these mistakes. But I've seen the pattern repeat across dozens of installations. The ones who buy the snow blower end up buying the Bohn unit anyway, a year later, having wasted money on both. The ones who buy the Bohn unit first? They don't ask about snow blowers.
If you're deciding between two freezer chest options, or wondering why your current unit is frosting up, start with the load calculation. Then pick the right Bohn evaporator. Skip the snow blower. Your future self will thank you.
