Warm Water Temperature Chart for Sourdough in a Cold 64 Degree (64°F / 18°C) Kitchen — Stand Mixer Low Speed (75°F DDT)
Winter thermal compensation: using 100°F (37.8°C) mix water to overcome 64°F flour and hit a 75°F Desired Dough Temperature.
Your mix water in a 64°F (17.8 Celsius) room needs to sit at 100°F (37.8°C) to finish at 75°F, provided the flour, levain and room are all 64°F and stand mixer low speed (75°f ddt) contributes +8°F of mechanical heat. The arithmetic is 4 × 75°F − (64 + 64 + 64 + 8) = 100°F. No ice is required here — temper all 350g of water to 100°F and the 75°F dough follows on its own.
- Required Water Temp
- 100°F (37.8°C)To hit 75°F DDT in 64°F room
- 350g Batch Ice Split
- 0g Ice / 350g WaterBased on 60°F tap water & 80 cal/g latent heat
- Mixer Friction Factor
- +8°FStand Mixer Low Speed
- Target Final Dough Temp
- 75°F (23.9°C)Locks fermentation clock & protease rate
Crushed Ice & Tap Water Gram Table for 64°F Kitchen (Stand Mixer Low Speed (75°F DDT))
Sums each row to the batch water weight so the split between ice and liquid always reconciles.
| Water Load | Theoretical Temp | Crushed Ice | Tap Water | Final Dough Temp |
|---|---|---|---|---|
| Batch 350g [Baseline] | target 100°F / 37.8°C | ice none | liquid 350g | lands on 75°F |
| Batch 400g Down 50g | target 100°F / 37.8°C | ice none | liquid 400g | lands on 75°F |
| Batch 300g Up 50g | target 100°F / 37.8°C | ice none | liquid 300g | lands on 75°F |
| Batch 500g Down 100g | target 100°F / 37.8°C | ice none | liquid 500g | lands on 75°F |
| Batch 250g Up 150g | target 100°F / 37.8°C | ice none | liquid 250g | lands on 75°F |
Interactive Desired Dough Temp (DDT) & Ice Solver Calculator
Compare your exact mixing bowl dimensions, flour protein percentage, or discard weight in real time.
Cold Kitchen Calorimetry: Why a 64°F Room Needs 100°F Mix Water (Stand Mixer Low Speed (75°F DDT))
Liquid water absorbs 1.0 cal/g per °C of warming, whereas solid ice at 0°C (32°F) absorbs 80 cal/g (144 BTU/lb) to melt into 0°C water before warming. That phase-change heat sink counteracts a 64 degrees (17.8°C) room plus +8°F of stand mixer low speed (75°f ddt) friction when the theoretical water temperature drops to 100°F.
Probe the ingredients, not the plan. Room, flour and levain each carry their own temperature in a 64 degrees (17.8°C) kitchen, and the 100°F (37.8°C) figure above assumes all three are at 64 degrees. A 3°F error in the flour alone shifts the finished dough by roughly 1°F.
Thermal Control Protocol for Stand Mixer Low Speed (75°F DDT) in a 64°F Room
- Weigh the Full Water Load: For a 350g batch you need 350g of liquid water and no ice. Set the scale up before you touch the flour.
- Chill the Water: Warm the 60°F tap water down to 100°F so the temperature is stable when the flour arrives.
- Mix in Stand Mixer Low Speed (75°F DDT): Combine flour and water, then run the mixer for the full recommended time so the +8°F of mechanical heat is actually generated rather than assumed.
- Confirm 75°F: Probe the finished dough immediately. In a 17.8°C (64°F) kitchen the reading should land on 75°F ± 1°F.
Frequently Asked Questions for This Desired Dough Temp (DDT) & Ice Solver Spec
Will the dough temperature change if I scale the recipe?
No. The 4-factor equation is a temperature balance, not a mass balance, so doubling the flour and water keeps the same 100°F target — but you must double the ice too, from 0g to 0g.
How accurate is the 100°F figure in practice?
Within about 1°F, provided the four inputs really are 64°F room, 64°F flour, 64°F levain and +8°F friction. Probe the finished dough to confirm and adjust your next bake.
How much colder is the water than the room in this 64°F (17.8°C) kitchen?
-36°F below the room temperature of 64°F. That gap is the entire thermal load that 8°F of stand mixer low speed (75°f ddt) friction and 64°F ingredients impose on the mix water.