Quick Answer: Finish and WiFi Decide It
Buy the Cool Cure C2 if you want the current default: stainless exterior and WiFi built in (its door handle adds 2 in of depth, not capacity). Step down to the C+ for the same capacity, control method and default cycle with a matte black shell and factory WiFi. Pick the C only if you want the lowest entry into Cannatrol's Vaportrol platform and can live without the app.
All three machines dry and cure up to 2.5 lb wet and 4.5 lb dry flower on six stainless shelves, and they all run the same 8-day default cycle. On the published specs, what separates them is the enclosure and the connectivity; capacity, control method and default cycle are the same. Here's how they break down in practice, and which one I'd hand a first-time grower.
The Three Models Side by Side
Cool Cure C2: What Changed and What Did Not
The C2 is not a capacity upgrade, and its published operating specs match the C and C+. Cannatrol's published specs list the same 58°F to 76°F operating temperature, the same 45°F to 65°F dew point range and the same three cycle modes (dry, cure and store) for all three units, and each has an interior air-movement duct. The wet and dry ratings are identical across the line. If you already own a C or C+, the C2's published specs give you no extra capacity and no new settings.
What changed is the outside. The C2 wears a stainless steel exterior instead of matte black, and at 22.75 in deep it sits two inches deeper than the C and C+ because of its door handle. Both C2 and C+ ship with built-in WiFi; the C makes it an optional add-on. All three run the same patented Vaportrol control, which sets dry bulb and dew point instead of a humidity percentage. That difference matters because water activity is a temperature-dependent measurement, and the FDA's water activity guidance notes that water activity increases with temperature. Controlling dew point and dry bulb together sets the air the flower equilibrates to; for reference, ASTM D8197 names 0.55 to 0.65 aw as the acceptable range for dry cannabis flower.
Here's the part buyers get wrong: none of these machines has a compressor, and none has an RH setpoint. If you're shopping by "what humidity do I set it to," you're shopping the wrong control philosophy. You set two temperatures and the cabinet does the rest. For small-batch home curing, I'd rather have that fixed logic than a manual RH dial I have to second-guess every day.
For your first run I'd leave the dry and cure presets alone. The defaults are a 52°F dew point for the dry phase and 54°F for cure, with a 68°F dry bulb, and the manufacturer's minimum recommended processing time is 8 days. Vaportrol is Cannatrol's technology, not a VIVOSUN feature, so don't let a spec sheet mixing the two confuse you. The C2 is stackable, draws roughly 30 watts in Store mode and up to 75 watts during the dry and cure cycle, and the interior is 100% food-grade ABS over six stainless shelves. The 1-liter water tray is front-access.
Read the deeper walkthrough of the platform in our Cannatrol Cool Cure review if you want the full operational picture before committing.
Cool Cure C+: The Connected Budget Option
The C+ is where most buyers should look if they don't care about the stainless shell. It carries built-in WiFi and the compatible smartphone app, so you can monitor and adjust the cabinet from anywhere without adding anything. That's the whole practical gap between the C+ and the base C. Same 2.5 lb wet capacity, same six shelves, same Vaportrol control, same 8-day default cycle, same 2-year parts-and-labor coverage handled by Cannatrol.
The C+ sits at 20.75 in deep, standard for the matte black shell, and weighs the same 51.3 lb as the other two. If the cabinet lives in a garage or a grow room where nobody sees it, the matte black finish is doing nothing for you that the C2's stainless does, and the phone app is the only feature that changes daily life. If you run one tent harvest at a time, I'd value checking the dew point from your phone over walking out to the unit every evening. For that use pattern, the C+ is the value pick in the line.
Cool Cure C: The Base Model
The C does everything the other two do to the flower. Where it parts ways is connectivity: WiFi is an optional add-on rather than factory-installed, and without it you run the cabinet from the touchscreen on the door. That's a real limitation if you cure in a detached space and want to check progress without a walk. It's a non-issue if the machine sits somewhere you pass daily.
Everything else matches the C+ to the ounce: 2.5 lb wet, 4.5 lb dry, six stainless shelves, the 1-liter front-access tray, dry bulb and dew point as the only settable variables, and the same stackable footprint at 20.75 in deep. The C is the tier I'd point an experienced grower toward when the budget is tight and the cabinet lives in a room they're in constantly. For most other buyers, the step up to the C+ is worth making. Confirm the WiFi upgrade path with Cannatrol directly, since the manufacturer lists WiFi as an optional upgrade for the C rather than a standard feature.
How to Choose
Choose by who you are, not by spec sheet. The specs are nearly identical, so the decision comes down to three questions: what the cabinet looks like where it sits, whether you need remote monitoring, and how much you want to spend.
If the machine goes on a kitchen counter or anywhere visible, the C2's stainless shell earns its place. If it lives in a garage, tent room, or workshop, matte black is fine and the C+ keeps the WiFi without the premium. If your budget is the deciding factor and you're near the unit daily, the C gets you the same cure for less.
Nobody in this lineup needs to worry about capacity. All three hold the same load, so capacity should not drive your choice across Cannatrol's model range. If you're weighing the Cool Cure against VIVOSUN's automated box, VCure vs Cannatrol compares the two, and the best curing machines compared sets all three models against every other automated option, from jar-top monitors to full cabinets. For the broader picture of how these cabinets fit a full harvest workflow, see how automated curing works and the complete guide to drying and curing cannabis.
Setting Up the First Run
Load the shelves with wet flower up to the 2.5 lb wet rating; the Cool Cure runs its own dry phase before the cure. Keep the load loose rather than packed tight, because the interior air-movement duct needs room to move air around every cola. Overstuffing a 2.5 lb cabinet to hit a number is the fastest way to an uneven cure.
Expect the humidity reading to rise early in the dry phase as moisture leaves the flower. That's the process working, not a fault. Don't open the door to check on it. Growers commonly judge the finish line with a stem snap and a jar-burp rhythm; with the cabinet, the schedule runs for you once it's dialed.
Worth knowing: curing doesn't fix bad growing, and the literature backs the curb on expectations. A Cornell hemp study found that drying and curing did not significantly affect total cannabinoid content, though curing converted some acidic cannabinoids to their neutral forms, and that curing doesn't enhance microbial safety risk from yeast and mold as long as temperature and relative humidity inside the curing containers are properly controlled (Baek et al., 2025).
Per ASTM D8196, controlling water activity should not be treated as a kill step. The cabinet is a quality tool, not a rescue tool.
If you need spare or extra shelves, Cannatrol sells replacement drying shelves. Browse the whole automated curing systems range if you want to compare the Cannatrol cabinet against other approaches.
Frequently Asked Questions
- What is the difference between the Cannatrol C, C+ and C2?
- All three dry and cure up to 2.5 lb wet and 4.5 lb dry flower on six stainless shelves with the same Vaportrol control and 8-day default cycle. The C2 has a stainless exterior, the C+ and C2 have built-in WiFi, and the C treats WiFi as an optional add-on.
- Is the C2 worth the upgrade?
- Only if you want the stainless shell with WiFi built in. Note its door handle adds 2 in of depth (22.75 in vs 20.75 in) without adding capacity. The C2 is not a capacity upgrade: same control, same 2.5 lb wet rating, same eight-day default cycle as the C and C+. Buyers who want factory WiFi at the lowest cost should look at the C+ instead.
- Do all Cannatrol models have WiFi?
- No. The C+ and C2 ship with built-in WiFi and app control. The base Cool Cure C lists WiFi as an optional add-on, and without it you operate the cabinet from the touchscreen on the door.
- Do the models hold the same amount?
- Yes. The C, C+ and C2 each handle up to 2.5 lb wet and 4.5 lb dry flower across six stainless steel shelves. Capacity does not change between the C, C+ and C2.
- Can you upgrade a C to WiFi later?
- Cannatrol lists WiFi as an optional feature for the C rather than a factory fit. Confirm the add-on path and current details with the manufacturer before buying, since the accessory isn't part of the standard cabinet package.
- Which Cannatrol should a first-time grower buy?
- The C2 if it will sit somewhere visible and you want the current model, or the C+ if it lives in a grow space and you just want factory WiFi without the stainless premium. Both share the base C's capacity, control method and default 8-day cycle.
- Does the Cannatrol have a humidity setpoint?
- No. Cannatrol controls dry bulb and dew point, not relative humidity. Water activity moves with temperature; for reference, ASTM D8197 names 0.55 to 0.65 aw as the acceptable range for dry cannabis flower.
