Precision cold-room control. It's kind of a Big Dill™.
ChillerDiller™ Pro turns a standard digital window AC or mini-split into a walk-in cooler controller for farms, restaurants and bars — with dual AC support, humidity monitoring*, a simple knob interface, over-the-air updates, frost protection, WiFi cloud logging and alarms.
*Humidity uses the optional Shelly BLU H&T sensor (monitoring only), sold separately. Shelly is a trademark of its owner; ChillerDiller™ Pro is compatible with, and not affiliated with, Shelly.
33 yearsNetMedia, Inc.
3-yearwarranty
-40°Fevery unit tested
Conformal-coatedboards
-40 to 85°Crated electronics
UL-listed5V 2A adapter included
How it works
Three probes. One cool loop.
A standard AC won't cool below its minimum setpoint. ChillerDiller™ Pro manages the AC's own sensor so it keeps running down to cooler temperatures — while watching the coil so ice doesn't build up.
Frost? I got this.
1
Coil probe watches for frost
A digital probe on the AC's evaporator coil tracks coil temperature, so the controller sees ice forming before airflow drops.
2
AC Duper keeps the AC running
The AC Duper — a super-duper probe that fools your AC's own temperature sensor into thinking the room is warmer, so it keeps cooling below its normal minimum setting.
3
Product probe sets room temperature
The product probe measures what matters — the temperature of your stored goods — and cycles the AC to hold your setpoint.
❄ Freeze timer
Smarter defrost behaviour. When the coil probe sees first frost, the freeze timer starts and keeps the AC running slightly past that point (some coils first freeze in just a few square inches) to pull more cooling out of each cycle. When the timer expires, the AC Duper switches off, so the AC senses a cooler room, shuts off its compressor and defrosts.
Inside or outside? You pick!
Mount it inside or outside the walk-in
Your call. Mount the controller inside the room, or run the 5 m (16 ft) cables out and mount it outside the walk-in, where it stays dry and easy to reach. Mounting inside? The boards are conformal-coated and rated -40 to 85°C.
Probes inside, controller inside or outside
Features
Tough on cold. Easy on you.
Every detail is chosen for condensation, low temperatures and years of unattended running.
2×
Two digital temperature probes
Dedicated coil and product probes deliver digital readings straight to the controller.
Stainless steel 6 mm probes
Stainless steel 6 mm probe tips, made for cold, damp rooms.
Conformal-coated boards
Electronics rated -40 to 85°C, and every unit is tested at -40°F before it ships.
Dunk it! Steady readings.
Product probe in glycerin
Place the product probe in glycerin for stable, product-like readings — HACCP-friendly food temperature records.
Glycerin and container not included.
High/low alarms + local buzzer
Set high and low limits. An on-board buzzer sounds locally while alerts go out over WiFi.
8×16 LED matrix + rotary knob
A bright 1.5 × 3 inch LED matrix display you can read across the room, plus a single knob for settings.
Feature highlights
Offline & power-loss alerts
Get notified if a unit drops offline or loses power.
Settings stored in flash
Your configuration survives power outages and comes back exactly as you left it.
Run-time & defrost stats
See how hard your AC is working and how often it defrosts — handy for spotting insulation or airflow problems.
Over-the-air updates
New firmware installs over WiFi. Release notes at chillerdiller.com/updates.
WiFi 2.4 GHz + free cloud logging
Readings, alerts and CSV logs on your phone or the web.
Use cases
For folks who store what they grow, hunt and make.
Farms, hunters, butchers, brewers, cheesemakers and florists all keep their cool with Big Dill™. Run a restaurant, bar or wine room? Keep scrolling, that's next.
Farm fresh
Farms & market growers
Pull field heat out of the harvest and keep produce crisp between picking and market day.
Season ready
Hunters & game processors
Hang and age game at a controlled temperature, with alerts if the room drifts.
Cut & chilled
Butchers & small food business
Downloadable temperature logs support your food-safety records.
Aged to perfection
Breweries, cheese & florists
Steady cold for kegs, aging wheels and fresh-cut stems.
Big Dill™ loves a busy kitchen. ChillerDiller™ Pro runs your walk-in from a standard AC, so the produce, the kegs and the good bottles all get a cool place to hang out.
Greens, kegs & reds? I'll keep 'em chill!
Produce walk-in
Lettuce be cool.
Set the walk-in anywhere from 34–59°F (38°F out of the box). The product probe sits with your stock and tells the AC when to cool.
Beer & kegs
Kegs, cases & back stock.
Give the beer room its own chill zone. Mount the controller inside, or run the 5 m (16 ft) cables out and mount it outside the walk-in, where the LED is easy to read.
Wine room
Cellar-style cool room.
The 34–59°F range covers cooler and cellar-style cool rooms. You pick the number. Big Dill™ keeps the AC working toward it.
Tell us what you store (produce, kegs, cases or wine) and roughly how big your walk-in is.
ChillerDiller™ Pro controls room temperature. How you store your food and drinks, and the rules that apply to your business, are up to you. Big Dill™ just keeps the room cool.
Built-in 2.4 GHz WiFi sends readings to free cloud logging. Check your rooms from a phone or browser — no software to install.
Free cloud logging with downloadable CSV logs for records and inspections.
Email alerts for high/low temperature, offline and power-loss events. Text alerts available as an opt-in.
Multi-unit account dashboard — every cooler you run, on one screen.
Cloud API at chillerdiller.com/API, plus Home Assistant and MQTT integration.
Ping! Walk-in 03 is running warm.
Dual AC mode
Two air conditioners. One controller.
Bigger room or no tolerance for downtime? Run two ACs from a single ChillerDiller™ Pro, each with its own coil sensor, AC Duper and independent freeze timer.
Two ACs? Double the chill.
Parallel
Both ACs cool together for maximum pull-down capacity.
Standby
One AC does the work; the second stands by as a backup.
Rotate
The ACs take turns to share wear between them.
Emergency backup
Too warm? Big Dill™ calls in the second AC automatically — in any mode — and alerts you. The display scrolls its own EMERGENCY: AC2 ON message until the room cools back down.
With the Second AC Kit. Buzzer on the controller; email alerts when connected to the cloud, plus texts if you opt in.
Emergency backupAC2 on
Optional Second AC Kit
AC Duper + coil sensor — the second AC gets its own super-duper probe that fools its built-in temperature sensor
+$79
Door open? You'll know.*
Wireless add-ons*
Add door and humidity sensing over Bluetooth.
ChillerDiller™ Pro is compatible with selected Shelly BLU wireless sensors.
Door-open alerts*
Compatible with Shelly BLU Door/Window sensors — get alerted when the walk-in door is left open.
Humidity & temperature*
Compatible with Shelly BLU H&T sensors for wireless humidity and temperature readings.
Add-on alerts*
* Requires separate Shelly BLU devices, not included. Shelly is a trademark of its owner; ChillerDiller™ Pro is not affiliated with or endorsed by Shelly.
Compatible AC types
Check your AC before you order.
ChillerDiller™ Pro works with air conditioners that have digital controls and automatically restart after a power interruption.
Works with
Digital window units
Wall-mounted mini-splits
…with auto-restart
Won't work
Knob / mechanical control
Portable units
Central air
RV units
PTAC units
Ceiling-cassette units
Digital + auto-restart
Digital + auto-restart? We're pals.
Pricing
Launch pricing.
Lock in the launch price with a pre-order. Launch price ends [DATE TBD].
Launch pricing? That's a Big Dill™!
Launch priceSingle AC
$299launch
Regular $379
ChillerDiller™ Pro controller
Coil probe, product probe & AC Duper (fools the AC's own temperature sensor so it keeps cooling)
5 m (16 ft) cables, gold-plated 3.5 mm jacks — mount inside or outside the walk-in
Two CoolBot Pro controllers One CoolBot per AC per Store It Cold FAQ; Jumper WiFi included with Pro. Verified Oct 24, 2026 at storeitcold.com.
$818 sale
$898 list
One ChillerDiller™ Pro + $79 Second AC Kit
$378 launch
$458 regular
Your savings
$440
$440
Savings of $440 at launch compared with the competitor's sale price.
Comparison based on publicly available information as of October 24, 2026. Specifications and prices may change.
CoolBot is a trademark of Store It Cold, LLC. All other trademarks belong to their owners. ChillerDiller™ Pro is made by NetMedia, Inc. and is not affiliated with or endorsed by them.
Specifications
The nitty-gritty.
Show the full spec sheet
Temperature probes
2 digital probes — coil and product; stainless steel, 6 mm
AC control
AC Duper — a super-duper probe that fools the AC's own temperature sensor into thinking the room is warmer, so it keeps cooling; freeze timer with coil frost detection switches the AC Duper off so the AC defrosts
Cables & connectors
5 m (16 ft) cables, gold-plated 3.5 mm jacks — mount the controller inside the walk-in, or run the cables out and mount it outside
Cloud API (chillerdiller.com/API), Home Assistant, MQTT
Alarms
High/low temperature, offline/power-loss; local buzzer
Statistics
AC run-time and defrost stats
Memory
Settings stored in flash — retained through power outages
Firmware
Over-the-air updates (chillerdiller.com/updates)
Dual AC
Parallel, Standby, Rotate; independent freeze timers; requires optional $79 Second AC Kit: AC Duper + coil sensor
Wireless add-ons*
Compatible with Shelly BLU Door/Window and Shelly BLU H&T (Bluetooth; sold separately)
Electronics rating
-40 to 85°C (-40 to 185°F); conformal-coated boards
Testing
Every unit tested at -40°F
Power
UL-listed 5V 2A adapter included
Compatible ACs
Digital window units or wall mini-splits with auto-restart
Warranty
3 years
FAQ
Ask Big Dill™.
What air conditioners work with ChillerDiller™ Pro?
Digital window units or wall-mounted mini-splits that automatically restart after a power interruption. Knob-controlled, portable, central, RV, PTAC and ceiling-cassette units won't work.
Do I need a computer?
No. Setup and monitoring happen over WiFi from your phone or a web browser.
Does it work without internet?
Yes. In "stay local" mode the controller keeps running your cooler on its own, using the LED display and knob — no internet connection required.
Are cloud logging and email alerts free?
Currently, yes — cloud logging and email alerts are free. Text alerts are opt-in.
How should I insulate my walk-in?
We recommend a minimum of R-25 using rigid closed-cell foam or spray foam. Insulate the floor too if you can — it makes a real difference to run-time.
Should I remove the AC's air filter?
No. Do not remove the AC filter — keep it in place.
Can I mount the controller outside the cooler?
Yes, either way works. Mount it inside the room, or run the 5 m (16 ft) cables out and mount it outside the walk-in, where it stays dry and easy to reach. Mounting inside? The electronics are conformal-coated, rated -40 to 85°C, and every unit is tested at -40°F before it ships.
Got questions? I'm all ears. Well… all pickle.
Pre-order
Reserve your ChillerDiller™ Pro.
Pre-order at the $299 launch price (regular $379). Leave your email and we'll send pre-order details and launch news. Launch price ends [DATE TBD].
