If you've ever stared at a freezer full of frost and wondered "why is my freezer frosting up"—or watched condensation drip from HVAC ducts in your warehouse—you're not alone. Humidity doesn't just annoy employees; it ruins equipment, drives up energy bills, and creates safety hazards.
As an office administrator managing purchasing for a 300-person facility, I deal with these problems from both sides: operations wants it fixed fast, finance wants it fixed cheap. Over the past few years, I've compared two main approaches to dehumidification—refrigerant (compressor-based) units versus desiccant systems like Munters. Here's what I found when I ran the total cost numbers.
This isn't a brand vs. brand comparison—it's a technology comparison. On one side, the standard refrigerated dehumidifier (think the kind you buy at a big-box store for $200–$2,000). On the other, a desiccant dehumidifier—like the Munters desiccant dehumidifier—that uses a rotating wheel and a heat source to pull moisture from the air, even in cold conditions.
The conventional wisdom says refrigerated dehumidifiers work fine for most spaces. And they do—if the temperature is above 60°F and the relative humidity isn't extreme. But here's the catch: In our 45°F warehouse (we store perishable goods), the refrigerant unit struggled. It iced up, cycled off, and barely kept humidity below 70%. Meanwhile, the Munters unit kept chugging along at 40% RH—even with the temperature dropping to 35°F.
That's because desiccant technology doesn't rely on condensation. It uses a silica-gel wheel that adsorbs moisture directly, then regenerates via a small heater (often called a Munters heater). So when you're asking “why is my freezer frosting up?” in a cold room, the answer might be that your dehumidifier can't work in the cold. A desiccant unit can.
This is where the total cost thinking really matters. The refrigerated dehumidifier had a lower sticker price—about $1,200 including installation. The Munters unit was $3,800. Ouch. My finance team winced.
But when I tracked the full year, including electricity, maintenance, and the cost of equipment failures caused by humidity, the picture flipped. The refrigerated unit ran nearly 18 hours a day in winter, consuming 1.2 kWh/h. The Munters unit ran only 8 hours a day (with an integrated timer), consuming 0.9 kWh/h. At $0.12/kWh, that's a yearly difference of about $480 in electricity alone. Maintenance for the refrigerated unit included two compressor repairs and a coil cleaning ($320 total). The desiccant unit required just a wheel cleaning ($50).
Over three years, the Munters system saved $1,230 in operating costs. The initial price gap was recouped in about 26 months. And that's before counting the cost of lost product due to moisture damage—one batch of paper goods in our storage room was ruined by condensation, costing $2,400. That single incident would have paid for the upgrade.
Refrigerant dehumidifiers work great when:
Desiccant dehumidifiers (like Munters) shine when:
In my case, we bought a Munters desiccant dehumidifier for the warehouse and kept a small refrigerant unit for the office break room. That combination worked well.
If you're an admin buyer like me, you'll probably be tempted by the lower initial quote from refrigerant models. I was. But after the first winter when our freezer kept frosting up and the maintenance guy shrugged, I realized the cheap path wasn't cheap.
Here's my rule of thumb:
And always calculate TCO: compare electricity rates, expected runtime, maintenance intervals, and the cost of potential product or equipment damage. The data as of January 2025 in my region showed a clear win for desiccant over three years—even with a 3x higher up-front price.
Honestly, I wish I'd done this analysis before buying the first unit. Would've saved me a call from my VP asking why the warehouse freezer looked like a snow cave.