A standard commercial walk-in cooler runs on a dedicated refrigeration compressor and condensing unit, sized for the cabinet and the worst-case ambient load. It is built to handle freezer use. The compressor is rated for the duty. The warranty is short because the equipment is being asked to do hard work.
For a florist shop holding flowers at 38 to 45 degrees, or a wine collector holding a cellar at 55 degrees, that walk-in compressor is doing way more work than the application needs. The cabinet load is mild. The temperature target is moderate. The compressor cycles on and off all day, drawing commercial-grade power on a job a smaller system could handle.
The mini-split + CoolBot conversion replaces the commercial walk-in compressor with a residential mini-split heat pump and a CoolBot controller. The CoolBot tricks the mini-split into running below its normal cooling lockout, down to about 35 degrees. The mini-split is right-sized for the actual load instead of oversized for a worst case. The result is lower power, longer warranty, quieter operation, and a system that uses parts available at every major HVAC distributor in the Bay Area.
The electricity math
A typical commercial walk-in compressor sized for a florist storefront cooler will draw between 1,500 and 3,500 watts at startup and steady-state, depending on size and load. A 12,000 BTU mini-split rated for the same cabinet will draw 700 to 1,500 watts at steady-state, often less in moderate weather. Over a year of continuous operation the savings show up as 30 to 50 percent on the cooler’s electricity line. A real florist customer in our service area cut their cooler’s contribution to the monthly power bill by roughly 40 percent after we did this work.
The wine cellar case is even better because the mini-split is barely working at a 55-degree setpoint. The compressor cycles short and sparse. Power draw on the cellar runs closer to a residential refrigerator than to a commercial refrigeration system.
The warranty math
Residential mini-split equipment from Daikin, Mitsubishi, Fujitsu, LG, and Bosch carries a 5 to 7 year manufacturer warranty on parts and compressor when registered and installed by an authorized contractor. Commercial walk-in refrigeration equipment from the standard supply houses typically carries 1 year on the compressor and 90 days on parts. That is a 5x to 7x warranty gap on the most expensive part of the system.
Our installation labor warranty on the mini-split side runs 1 year, same as our HVAC repair work. Combined coverage on a fresh mini-split + CoolBot install: 5 to 7 years parts + 1 year labor.
Who this is for
Florist shops. Walk-in storefront coolers holding flowers at 38 to 45 degrees. The cooler runs all day, every day, year round. Power savings compound. Lower noise inside the shop is a nice side effect.
Wine cellars. Pool-house cellar conversions, basement cellars, custom wine rooms in the 200 to 1500 bottle range. Temperature target 50 to 58 degrees. The mini-split barely works, runs quiet, and parts are easy to source.
Beverage and produce coolers. Small-format retail and food-service coolers holding 35 to 45 degrees.
Charcuterie and cheese caves. Same temperature range as wine, plus controlled humidity. CoolBot works here too.
Who this is NOT for
Freezer applications below 35 degrees. CoolBot does not go that low. If you need a true freezer, you need a true commercial refrigeration system. We will tell you that on the diagnostic visit and not push a conversion that does not fit.
Large industrial coolers above about 400 cubic feet. The mini-split sizing gets tight and the system becomes less efficient than a properly-sized commercial unit. We will quote either way and lay out the math.
How the install works
The job runs as a joint between our appliance division and our HVAC division, Bay Area HVAC Service:
- Site visit ($75 diagnostic): we measure the cabinet, read the existing compressor draw on the old walk-in if it is still running, check electrical capacity at the panel, and plan line-set routing.
- Quote: we write the full install scope and price before any work starts. Equipment model, line-set length, electrical work, CoolBot install, decommission of the old walk-in unit, disposal.
- Install: our HVAC division handles the mini-split mount, the line set, the electrical connection, the refrigerant charge, and the startup commissioning. Our appliance division handles the CoolBot wiring, sensor placement inside the cabinet, and the decommission of the old walk-in compressor.
- Verification: we measure cabinet pull-down to setpoint, verify the CoolBot is reading the cabinet correctly, and run the system through a full daily cycle before we leave.
- Walkthrough: we show you the CoolBot controls, the setpoint adjustment, and what to call us about if something changes.
Booking
Call (925) 999-4095 or use the form on the contact page. For florists especially, we can schedule the install to minimize downtime by pre-staging equipment and doing the swap in a single working day.
Related: Commercial refrigeration service · Wine fridge and wine cooler repair guide · Bay Area HVAC Service (our HVAC division) · Contact