Home › Commercial Refrigeration Guide › Walk-In Cooler & Freezer Guide › Walk-In Coolers for Florists
Updated October 14, 2026
Quick answer
Flower coolers run warmer and wetter than food coolers. Many cut flowers keep best just above freezing with high humidity and gentle airflow, while tropical flowers need much warmer storage. The refrigeration must remove heat without drying or freezing blooms, which affects evaporator choice, defrost and setpoint.
Temperature and humidity
| Product | Typical approach |
|---|---|
| Most cut flowers (roses, carnations and similar) | Cold, just above freezing, high humidity |
| Tropical flowers (orchids, anthurium, ginger) | Much warmer; often a separate space |
| Foliage and greens | Cool, humid |
| Display cooler (front of shop) | Glass doors; warmer than back-room storage for viewing |
Ask your wholesaler for the right range for your mix; product needs vary. The key point for refrigeration is that a flower cooler needs high humidity and steady temperatures.
What this means for the refrigeration
- Low-velocity evaporators or diffused airflow avoid drying and bruising blooms.
- Larger coils with smaller temperature difference pull less moisture out of the air.
- Defrost matters: high humidity means more frost load; see defrost explained.
- Accurate controls prevent freezing near the coil. See controllers.
Ethylene and cleanliness
Many flowers are sensitive to ethylene gas, which comes from ripening fruit and decaying plant material. Do not store fruit with flowers, keep the cooler clean, and remove spent stems promptly. Clean evaporator coils and drain pans help, because organic debris grows mold and odors.
Common florist cooler problems
- Petals drying or browning near the evaporator: airflow too strong or coil too cold.
- Frost on the coil from high humidity and frequent door openings.
- Glass display doors fogging.
- Holiday overload: Valentine's Day and Mother's Day bring huge volumes; book maintenance before them.
Equipment options
Arctic Industries and U.S. Cooler list floral among their markets; many florists also use glass-door display coolers. Small shops sometimes use a CoolBot room. See Arctic Industries.
Display cooler vs back-room walk-in
| Glass-door display cooler | Back-room walk-in | |
|---|---|---|
| Purpose | Show arrangements to customers | Store bulk flowers and greens |
| Temperature | Often a little warmer so arrangements look fresh and doors fog less | Colder for longest vase life |
| Common faults | Fogged glass, failed door heaters, lighting heat | Coil frost, dry air, door wear |
| Service focus | Anti-sweat heaters, lighting, closers | Airflow, defrost, humidity, setpoint |
Getting humidity right
Refrigeration dehumidifies: the colder the evaporator coil runs below the room temperature, the more water it pulls from the air. Flower coolers want high humidity, so they are best served by a larger evaporator coil running a smaller temperature difference, slower fan speeds, and doors kept closed. Signs the air is too dry include crisp petal edges and leaves wilting faster than they should. Signs it is too wet include mold on stems, dripping ceilings and fogged doors. Your technician can adjust settings, and in some cases change the evaporator, to find the balance.
Getting ready for peak holidays
- Book a coil cleaning and system check two to three weeks before the holiday.
- Check door gaskets and closers; door traffic triples on peak days.
- Confirm the alarm reaches someone after hours.
- Plan where overflow stock will go; an overloaded box blocks airflow.
- Keep a spare thermometer in the box to cross-check the display.
Owner checks for a florist cooler
- Check the temperature with a separate thermometer in the middle of the box.
- Look at blooms nearest the evaporator for freezing or drying.
- Check the evaporator for frost.
- Check the door seals and closes.
- Check glass display doors for fogging.
Note which flowers are affected and where they were stored; it helps the technician adjust airflow and setpoint.
Bay Area note
Bay Area florists often operate in compact storefronts where the walk-in, display coolers and workroom share a small space. Heat from self-contained units and lighting adds up. Remote condensing units, LED lighting and intact door seals keep both the flowers and the staff more comfortable.
When to call a technician
Call before your peak holidays for a check-up, and immediately if blooms start freezing or drying near the evaporator.
Open 7 days, 8 AM to 5 PM, with emergency service until 9 PM. CA Lic. #776244.
Frequently asked questions
What temperature should a flower cooler be?
Many cut flowers keep best just above freezing; tropical flowers need much warmer storage. Ask your wholesaler for your mix.
Why are my flowers drying out in the cooler?
Airflow may be too strong or the coil too cold, pulling moisture from the air.
Can I store fruit in my flower cooler?
Avoid it; ripening fruit gives off ethylene, which harms many flowers.
Can a regular walk-in be used for flowers?
Yes, often with adjustments to airflow, setpoint and defrost.
When should I service my flower cooler?
Before peak holidays such as Valentine's Day and Mother's Day.
Why does my flower cooler drip from the ceiling?
Usually high humidity with a cold spot or air leak, or a drain issue at the evaporator. A technician can trace it.
Can I keep tropical flowers in my main cooler?
Many tropicals are damaged by cold. Store them in a warmer space.
How often should a flower cooler be serviced?
At least twice a year, plus a check before major holidays.
Does a flower cooler need a different evaporator?
Often a larger, slower-moving coil works better, because it removes less moisture and is gentler on blooms.
Related guides
Sources
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