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Heat sinks increase’s a portal‘s hack speed, meaning it reduces the cooldown time after a hack. They also reset the portal’s cooldown and burnout timers for the deploying agent at the time it is installed. The cooldown reduction of each heat sink is as follows:

  • Common: -20%
  • Rare: -50%
  • Very Rare: -70%

If you have more than one heat sink installed on a portal, only the rarest one will function at full effectiveness; the remaining ones will be half as effective as they would normally be. The chart below shows the resulting cooldown time from every possible combination of installed heat sinks:

Mod 1 Mod 2 Mod 3 Mod 4 Cooldown
(sec)
300
Common 240
Common Common 216
Common Common Common 194
Common Common Common Common 175
Rare 150
Rare Common 135
Rare Common Common 122
Rare Common Common Common 109
Rare Rare 113
Rare Rare Common 101
Rare Rare Common Common 91
Rare Rare Rare 84
Rare Rare Rare Common 76
Rare Rare Rare Rare 63
Very Rare 90
Very Rare Common 81
Very Rare Common Common 73
Very Rare Common Common Common 66
Very Rare Rare 68
Very Rare Rare Common 61
Very Rare Rare Common Common 55
Very Rare Rare Rare 51
Very Rare Rare Rare Common 46
Very Rare Rare Rare Rare 38
Very Rare Very Rare 59
Very Rare Very Rare Common 53
Very Rare Very Rare Common Common 47
Very Rare Very Rare Rare 44
Very Rare Very Rare Rare Common 39
Very Rare Very Rare Rare Rare 33
Very Rare Very Rare Very Rare 38
Very Rare Very Rare Very Rare Common 34
Very Rare Very Rare Very Rare Rare 29
Very Rare Very Rare Very Rare Very Rare 25