These run a walk-in box you already have or a room you insulate yourself. A CoolBot lets a window or mini-split air conditioner hold about 34 F without icing its coil, the cheapest route to a cooler but not usable for a freezer. A window-style cooler unit and a monoblock unit come pre-charged and run once wired; the monoblocks here are also rated for freezer temperatures. A split system puts the condensing unit outside and the evaporator inside, and a technician must evacuate the lines and charge the refrigerant. Size any unit to the room’s volume and insulation, and check whether a system’s evaporator is rated below its condensing unit.
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Full ranking 7
- Elite Kitchen Supply KW-25R32CSO#1 of 7Full review
A purpose-built window-style cooler unit for a DIY walk-in, with the controls built in. It suits a large insulated room where a CoolBot and a household air conditioner would fall short.
Amazon $1,432$1,43225,000 BTU/hr25,000 BTU/hr33 to 41 F - Elite Kitchen Supply XWZ400T#2 of 7Full review
A large top-mount monoblock that can run a big walk-in cooler or a mid-size freezer without a refrigeration contractor. Check that your box roof can carry it.
Amazon $6,439$6,43927,501 BTU/hr (8,060 W)27,501 BTU/hr (8,060 W)0 to 50 F - Elite Kitchen Supply HGZ-400#3 of 7Full review
A big split system for a large walk-in cooler at a low price, if you have a technician to install it. The evaporator, not the condensing unit, sets its real capacity.
Amazon $5,036$5,03630,026 BTU/hr (8,800 W)30,026 BTU/hr (8,800 W)- - Elite Kitchen Supply XML-200TP#4 of 7Full review
A one-piece wall-mount unit for a small walk-in freezer or cooler, installed without a refrigeration technician. Good where nobody local will charge a split system.
Amazon $5,191$5,19115,149 BTU/hr (4,440 W)15,149 BTU/hr (4,440 W)Down to 0 F - Elite Kitchen Supply HGZ300#5 of 7Full review
A complete split condensing unit and evaporator set at a low price, for a walk-in where a refrigeration technician will run the line set and charge it. The evaporator, not the condensing unit, sets its real capacity.
Amazon $4,494$4,49423,372 BTU/hr (6,850 W)23,372 BTU/hr (6,850 W)- - CoolBot Pro#6 of 7Full review
The CoolBot with Wi-Fi monitoring, worth the small premium for any cooler holding produce or meat you can’t afford to lose. Pair it with a window or mini-split air conditioner.
Amazon $399$399--Down to 34 F - CoolBot Walk-In Cooler Controller#7 of 7Full review
The standard way to build a farm or hunting walk-in on a budget: an insulated room, a window air conditioner and this controller. Get the Pro if you want phone alerts.
Amazon $349$349--Down to 34 F
