Inkbird ITC308 Freezer Thermostat Heating Cooling Plug Temperature Controller 110V 1200W Review (2026)

Who should buy this controller

This unit suits a brewer converting a standalone chest freezer or mini fridge into a fermentation chamber and who wants both heating and cooling control from a single device rather than a cooling-only thermostat. Because it plugs in rather than requiring the appliance to be wired internally, it also fits a renter or anyone who wants to keep the freezer's original wiring untouched in case it needs to be sold or returned to normal use later. A brewer running only a heat belt for winter fermentation temperatures, without needing cooling, may find a simpler single stage controller is enough, but anyone chasing consistent year round fermentation temperature benefits from the two stage design here.

Specs and how the two outlets work

This listing is rated for 100 to 240 volt AC input at 10 amps, with a maximum wattage of 1200 watts on a 110 volt circuit, which covers typical mini fridges, chest freezers and small heat sources used in home fermentation. An NTC temperature probe is included and attached, and the controller reads that probe rather than internal ambient temperature to decide when to power its heating outlet or its cooling outlet. A compressor delay setting is built in, which holds off restarting a fridge or freezer's compressor for a set period after it powers down, protecting the compressor from the short cycling that can shorten its lifespan.

Living with it day to day

Setup follows the same pattern as most Inkbird dual stage controllers: tape the probe to the fermenter, ideally with a bit of foam insulation over it so it tracks the beer's temperature rather than the chamber's air temperature, then plug the freezer or fridge into the cooling outlet and any heat source into the heating outlet. Menus can take a few minutes to learn on the first setup, since target temperature, differential and compressor delay are all separate settings to configure. Once dialed in, the controller runs unattended, which is the main appeal for someone fermenting lagers or temperature sensitive ale strains over several weeks.

How it compares with similar Inkbird and iPower controllers

Against the other Inkbird ITC-308 listing in this guide, this freezer thermostat is close enough in specification that the decision often comes down to price, seller and current stock rather than a meaningful performance gap. Compared with the ITC-308S, which is a pre-wired variant meant for a more permanent install inside an appliance, this plug and outlet version is easier to move between projects or remove entirely. Against iPower's dual outlet controllers, Inkbird's wider use in the homebrewing community means more shared setting guides for specific beer styles, which can shorten the learning curve for a first time buyer.

Bottom line

At our score of 9.0 out of 10, this ITC308 is a capable, well specified dual stage controller for anyone building a fermentation chamber out of a spare freezer or fridge. Because it is so similar to the other Inkbird ITC-308 listing in this guide, it is worth comparing current price and seller reputation before choosing between them rather than assuming one is meaningfully better. Brewers who want a hardwired, permanent installation should look at the pre-wired ITC-308S, while anyone who wants to move the controller between projects will appreciate this plug-and-play design.

Frequently asked questions