Buying guide
Fermentation Temperature Control
Updated How we research
Hold a steady temp for cleaner beer. The page is split into five sections (Control The Temperature; Warm Cold Batches; Build A Fermentation Chamber; Seal With An Airlock; Vent Active Ferments), followed by every pick ranked by our score so you can compare them in one place.
The short version
We compared 20 picks. Our scores range from 7.0 to 9.2 out of 10.
- Best overall:Inkbird ITC-308 Digital Temperature Controller 2-Stage Outlet Thermostat Heating and Cooling. Highest overall score in this guide at 9.2/10.
- Also great value:Brewland 6 Packs 3 Piece Airlocks for Fermenting with #6 Stoppers and Grommets. Value score of 9/10, overall 8.6/10.
- Solid build:Speidel 30L (7.9 Gallon) Plastic Fermenter with Spigot, Bung & Airlock. Build and materials score of 9/10, overall 8.5/10.
- Feature-rich:Inkbird ITC308 Freezer Thermostat Heating Cooling Plug Temperature Controller 110V 1200W. Features score of 9/10, overall 9.0/10.
Scores are our editorial assessment, not customer ratings. How we score
Control The Temperature
- Inkbird ITC-308 Digital Temperature Controller 2-Stage Outlet Thermostat Heating and CoolingOur score9.2/10
- Inkbird ITC308 Freezer Thermostat Heating Cooling Plug Temperature Controller 110V 1200WOur score9.0/10
- iPower Temperature Controller 1200W 10A Dual Digital Outlet Thermostat 2 Stage (2 Pack)Our score8.0/10
- Digital Temperature Controller Thermostat Heating and Cooling Dual Relay Output 10A 1250WOur score7.0/10
Warm Cold Batches
- FermWrap FE650-40 Watt Fermentation HeaterOur score8.4/10
- Kenley Fermentation Heater Carboy Warmer - Kombucha Heating Wrap with ThermostatOur score8.2/10
- Fermtech Fermentation Heating Belt - Electric Brew Beer Wine Kombucha Warming BeltOur score7.3/10
- FastRack Brew Fermentation Heating Belt, 1-Count, Blue, LargeOur score7.0/10
Build A Fermentation Chamber
- Cool Brewing Fermentation Cooler - Beer Brewing Temperature Control Keg Cooler BagOur score7.6/10
- Cool Brewing CoolBrewCorny 3.0 Keg Cooler for 5 Gallon Corny/Cornelius KegsOur score7.5/10
- Cool Brewing Insulated Fermentation BagOur score7.3/10
- Eagle FE530 Cool Brewing Insulated Fermentation BagOur score7.1/10
Seal With An Airlock
- Brewland 6 Packs 3 Piece Airlocks for Fermenting with #6 Stoppers and GrommetsOur score8.6/10
- Molovee 3-Piece Airlock Fermentation Beer Wine Brewing Air Locks 3Pack with Silicone GrommetsOur score7.8/10
- 3 Piece Airlock Set for Brewing Wine Making Kimchi (3 Airlock+3 Stoppers+6 Grommets)Our score7.8/10
- SocalHomeBrew Plastic 3 Piece Airlock (Pack of 3)Our score7.6/10
Vent Active Ferments
- Speidel 30L (7.9 Gallon) Plastic Fermenter with Spigot, Bung & AirlockOur score8.5/10
- Blow-Off Tube 1 Inch I.D. (5 Foot)Our score8.4/10
- Coldbreak Brewing Equipment CBBTC Carboy Blow Off Tube for 5-6.5 gal Glass Carboys (Pack of 3)Our score8.4/10
- Home Brew Ohio 7.9 Gallon Fermenting Bucket with Grommeted LidOur score7.2/10
All 20 picks, ranked by our score
Every product from the sections above, listed once. Sort by the criterion you care about most, or tick up to three to compare.
#1Inkbird ITC-308 digital 2-Stage outlet thermostat for heating and cooling, a homebrew favorite for fermentation fridges.
Fit for the job 10/10 · Features and specs 9/10 · Build and materials 8/10 · Value 9/10
- + 2-Stage control runs a heater and fridge from one unit
- + Plug-and-play outlets mean no wiring for fermentation chambers
- + Inkbird is widely used by homebrewers, so setup guides are plentiful
- - Probe should be taped to the fermenter for accurate beer temperatures
- - Menus take a few minutes to learn from the manual
#2Inkbird ITC308 freezer thermostat plug controller for heating and cooling, 110V 1200W.
Fit for the job 10/10 · Features and specs 9/10 · Build and materials 8/10 · Value 8/10
- + Plug-in design turns a freezer into a fermentation chamber easily
- + 110V 1200W rating suits standard US appliances
- + Separate heat and cool outlets allow tight temperature control
- - Similar to the other ITC-308 listing, so compare seller and price
- - Compressor delay settings must be configured to protect fridges
#3Brewland's 6 Packs of 3 Piece airlocks with #6 stoppers and grommets for fitting buckets and carboys.
Fit for the job 9/10 · Features and specs 9/10 · Build and materials 7/10 · Value 9/10
- + 6 Packs gives airlocks for multiple fermenters plus spares
- + Includes #6 stoppers and grommets for both carboys and bucket lids
- + 3 Piece design comes apart fully for easy cleaning
- - #6 stoppers do not fit wider carboy necks that need larger bungs
- - 3 Piece airlocks can let sanitizer suck back during cold crashes
#4Speidel 30L (7.9 Gallon) plastic fermenter with spigot, bung and airlock, a German-made fermenter with generous headspace.
Fit for the job 8/10 · Features and specs 9/10 · Build and materials 9/10 · Value 8/10
- + Speidel is a respected German maker with thick, durable plastic
- + Spigot, bung and airlock included for a complete fermenting setup
- + 30L size leaves room to control krausen on five gallon batches
- - Narrow opening is harder to clean than a wide bucket
- - Premium fermenter costs more than basic plastic buckets
#5FermWrap FE650-40 Watt fermentation heater, a flexible heat panel for warming fermenters in cool spaces.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10
- + 40 Watt output gives gentle warmth that will not scorch yeast
- + Flexible wrap works on buckets, carboys and conicals
- + Pairs well with an external temperature controller
- - No built-in thermostat, so a controller is needed for precision
- - Needs taping or strapping to stay in contact with the fermenter
#6A 5 Foot blow-off tube with 1 Inch I.D., for venting foamy krausen from carboys during vigorous fermentation.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 7/10 · Value 9/10
- + 1 Inch I.D. tube fits snugly inside many carboy necks
- + 5 Foot length reaches a bucket of sanitizer on the floor
- + Prevents airlock clogs and messy blowouts in active ferments
- - Tube only fits certain carboy necks, so measure the opening
- - Wide tubing can suck sanitizer back during temperature drops
#7Coldbreak's CBBTC Pack of 3 carboy blow off tubes for 5-6.5 gal glass carboys.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10
- + Designed for 5-6.5 gal glass carboys, so fit is predictable
- + Pack of 3 gives spares for several fermenters
- + Coldbreak builds brewing-specific accessories
- - Not intended for plastic buckets or wide mouth fermenters
- - Tubing needs thorough cleaning after thick krausen passes through
#8Kenley's fermentation heater wrap with thermostat for keeping carboys and kombucha jars warm.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + Thermostat control prevents overheating compared with plain heat belts
- + Wrap style fits carboys and kombucha jars of different sizes
- + Helps ale and kombucha ferment steadily in cold rooms
- - Check the wrap wattage and size against your fermenter before ordering
- - Heats only one side, so gentle swirling helps even out temperatures
#9A 2 Pack of iPower 1200W 10A dual digital outlet thermostats with 2 Stage control for fermenters and chambers.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 9/10
- + 2 Pack lets you control two fermentation chambers independently
- + Dual outlets handle both heating and cooling devices
- + 1200W rating covers typical fridges and heat wraps
- - 10A limit may not suit larger chest freezers with high startup draw
- - Less homebrew community documentation than Inkbird models
#10Molovee's 3Pack of 3-Piece airlocks with silicone grommets for beer and wine fermentation.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + Silicone grommets seal well on bucket lids and stay flexible
- + 3-Piece airlocks are easy to disassemble and sanitize
- + 3Pack covers a few fermenters for small batch brewers
- - No stoppers included, so carboy users need to buy bungs
- - Thin plastic parts can crack if dropped on a hard floor
#11A 3 Piece airlock set with 3 Airlock, 3 Stoppers and 6 Grommets for brewing, winemaking and kimchi.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + 3 Stoppers and 6 Grommets cover jars, carboys and bucket lids
- + Useful for kimchi and vegetable ferments as well as beer and wine
- + Full set means fewer trips for missing fittings
- - Check the stopper size fits your jars and carboys before ordering
- - Generic airlocks may have looser caps than brand name ones
#12Cool Brewing's fermentation cooler bag, an insulated bag that uses ice packs to hold fermenter or keg temperatures.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + Insulated bag keeps fermenters cool with swapped frozen water bottles
- + Blocks light that can skunk beer during fermentation
- + Folds down flat for storage when it is not in use
- - Needs regular ice changes, which is less precise than a fridge
- - Fit depends on fermenter shape, so check bucket and carboy sizes
#13SocalHomeBrew's Pack of 3 plastic 3 Piece airlocks, a basic airlock refill for homebrew fermenters.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + Pack of 3 provides spares for multiple fermenters
- + Simple 3 Piece design is easy to fill and clean
- + Standard size fits common grommets and drilled stoppers
- - No grommets or stoppers included in the pack
- - Cap can pop off during very vigorous fermentation
#14Cool Brewing CoolBrewCorny 3.0 keg cooler for 5 Gallon Corny/Cornelius kegs, keeping homebrew cold away from a kegerator.
Fit for the job 7/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + Sized for 5 Gallon Corny kegs, so the keg fits snugly
- + Lets you serve cold beer at parties without a kegerator
- + Updated 3.0 version refines the earlier keg cooler design
- - Designed for kegs, not fermenters, so it is less useful during fermentation
- - Requires ice to stay cold for a full event
#15Fermtech's electric fermentation heating belt for brew, beer, wine and kombucha warming.
Fit for the job 8/10 · Features and specs 6/10 · Build and materials 7/10 · Value 8/10
- + Works across beer, wine and kombucha fermentation
- + Belt form is easy to move between different fermenters
- + Fermtech is a known homebrew accessory brand
- - Pair this belt with a separate temperature controller for best results
- - Band heating can create warm spots near the belt
#16Cool Brewing's insulated fermentation bag, a budget-friendly way to steady fermenting temperatures without a chamber.
Fit for the job 8/10 · Features and specs 6/10 · Build and materials 7/10 · Value 8/10
- + Insulation buffers temperature swings in garages and basements
- + Much cheaper and more portable than a dedicated fermentation fridge
- + Also useful for keeping kegs cool at events
- - Cooling relies on ice packs, so daily attention is required
- - Zippers and seams can wear with repeated use
#17Home Brew Ohio's 7.9 Gallon fermenting bucket with grommeted lid, giving extra headspace to reduce blowoffs.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + 7.9 Gallon size leaves large headspace, often avoiding the need for a blow-off
- + Grommeted lid accepts an airlock or blow-off tube
- + Bucket style is easy to clean through the wide top
- - Check whether an airlock or blow-off tube is included before ordering
- - Tall bucket takes more room in a fermentation chamber
#18Eagle FE530 Cool Brewing insulated fermentation bag, a soft cooler that holds fermenters at steadier temperatures.
Fit for the job 8/10 · Features and specs 6/10 · Build and materials 7/10 · Value 7/10
- + Insulated walls slow temperature swings during active fermentation
- + Dark bag protects fermenting beer from light
- + Collapsible design stores flat between batches
- - Needs frozen bottles swapped often in hot weather
- - Appears to be the same bag as other Cool Brewing listings, so compare prices
#19A digital heating and cooling temperature controller thermostat with dual relay output, rated 10A 1250W.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 6/10 · Value 8/10
- + Dual relay output separates heating and cooling devices
- + 1250W rating handles common fermentation fridges
- + Digital display makes set points easy to monitor
- - Compare the probe quality against dedicated brewing controllers
- - May need wiring if it lacks plug-in outlets
#20FastRack's large blue brew fermentation heating belt, 1-Count, for adding steady warmth to carboys and buckets.
Fit for the job 7/10 · Features and specs 6/10 · Build and materials 7/10 · Value 8/10
- + Simple belt wraps around fermenters for a gentle heat boost
- + Large size fits bucket fermenters as well as carboys
- + Low cost way to keep ale temperatures up in winter
- - No thermostat, so it can overheat small batches in warm rooms
- - Heat is concentrated on one band around the fermenter
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Home Brew Craft curates picks for US shoppers. Scores are our editorial assessment. We may earn a commission from links on this page.