Summer Sourdough Crushed Ice & Water Temp Chart for a Hot 80 Degree (80°F / 27°C) Kitchen — High-Friction Planetary Mixer (76°F DDT)
4-factor Desired Dough Temperature (DDT) and 80 cal/g latent heat crushed-ice calculation for hitting 76°F dough in a hot 80°F room.
In a 80°F (26.7 Celsius) kitchen (assuming flour and levain are also at 80°F) with High-Friction Planetary Mixer (76°F DDT) (+24°F mechanical friction), the 4-factor DDT equation [4 × 76°F − (80 + 80 + 80 + 24)] requires a theoretical mix water temperature of 40°F (4.4°C). Because 40°F is colder than 76°F tap water, use the 80 cal/g latent heat of fusion formula: for a 350g water batch, mix 67g of finely crushed ice with 283g of tap water.
- Required Water Temp
- 40°F (4.4°C)To hit 76°F DDT in 80°F room
- 350g Batch Ice Split
- 67g Ice / 283g WBased on 76°F tap water & 80 cal/g latent heat
- Mixer Friction Factor
- +24°FHigh-Friction Planetary Mixer
- Target Final Dough Temp
- 76°F (24.4°C)Locks fermentation clock & protease rate
Water Temperature Solver: 80°F (26.7°C) Room, High-Friction Planetary Mixer (76°F DDT) (+24°F)
Read the ice column as a direct instruction: weigh that much crushed ice and make up the balance with 76°F tap water.
| Total Water | Calculated Temp | Ice Quantity | Tap Water Quantity | Dough Temp Target |
|---|---|---|---|---|
| [Anchor]: 300g total water | mix at 40°F | substitute 57g ice | keep 243g warm water | friction +24°F absorbed |
| Quarter Batch: 350g total water | mix at 40°F | substitute 67g ice | keep 283g warm water | friction +24°F absorbed |
| Three-Quarter Batch: 500g total water | mix at 40°F | substitute 96g ice | keep 404g warm water | friction +24°F absorbed |
| Half Batch: 250g total water | mix at 40°F | substitute 48g ice | keep 202g warm water | friction +24°F absorbed |
| Double Batch: 400g total water | mix at 40°F | substitute 77g ice | keep 323g warm water | friction +24°F absorbed |
Real-Time Dough & Starter Scaling Sandbox
Scale this What Water Temp for Sourdough in a 8 specification up or down on your digital scale with zero hydration drift.
Baking Sourdough in a Hot 80°F Room: Why You Need 40°F Water (67g Ice)
Latent heat of fusion is why the cooling arithmetic is not linear. Replacing 67g of the 350g of water with crushed ice removes not merely 67g × 1 cal/g of sensible heat, but 67g × 80 cal/g of phase-change heat, which is what allows a 26.7°C (26.7°C) room to be cooled into a 76°F dough.
The recipe's own water temperature is not the mix water temperature. If your recipe specifies water at 90°F because it was written for a 68°F kitchen, that number has to be re-solved for this 80°F (26.7°C) room and for the +24°F that high-friction planetary mixer (76°f ddt) generates.
Thermal Control Protocol for High-Friction Planetary Mixer (76°F DDT) in a 80°F Room
- Account for the Friction First: High-Friction Planetary Mixer adds +24°F, so subtract it from your target before you calculate the water temperature — that single step is what distinguishes a 76°F dough from a warm one.
- Solve the 4-Factor Equation: 4 × 76°F − (80 + 80 + 80 + 24) = 40°F of mix water for this 80°F (26.7°C) room.
- Execute the Ice Swap: Replace 67g of the 350g with finely crushed ice and keep 283g of 76°F tap water, melting the ice fully first.
- Probe the Finished Dough: The reading should be 76°F ± 1°F; anything else means one of the three probed ingredients was off.
Diagnostic Answers: What Water Temp for Sourdough in a 80°F (27°
Does the type of mixer actually change the water temperature?
Yes, and that is exactly what the friction factor models. High-Friction Planetary Mixer (76°F DDT) contributes +24°F, so the same 26.7°C (80°F) kitchen needs a 40°F mix water for this machine and a different one for a hand-mixed dough.
Can I mix the ice directly into the flour?
Yes, and it is often the better technique. Mixing 67g of crushed ice into the 283g of water and flour together chills the mass faster than adding cold water to warm flour, and the 80 cal/g phase change is fully captured.
How much colder is the water than the room in this 80°F (26.7°C) kitchen?
40°F below the room temperature of 80°F. That gap is the entire thermal load that 24°F of high-friction planetary mixer (76°f ddt) friction and 80°F ingredients impose on the mix water.