Because they’re hooked to hot water heaters. The “cold” water is just the temperature of the water that runs into your house from your well, water tower, or city water connection. That’s why it’s colder in the winter and warmer in the summer.
They do make water coolers you can add to your system to make it dispense cold water, but it’s an extra expense, and an extra thing that could leak or break, and an extra tank where mold or mildew could grow and contaminate your water.
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