Usage:
   ObjectTemplate.PassiveHeatIncrement number

Argument values:

Description: This property affects how much "heat" is generated when an object is not in use. It is used for the jetpack, to control fuel use when the jetpack is not being operated.

Related properties: ActiveHeatIncrement

Used in object types (always present 100% of the time): ActiveKitPart

Used in one .con file: objects/Items/GerEliteKit/Common/Objects.con

Example: (from objects/Items/GerEliteKit/Common/Objects.con)
   ObjectTemplate.Create ActiveKitPart GermanElite_RocketPack
   ObjectTemplate.Geometry GermanElite_rocketpack
   ObjectTemplate.SetBoneName backpack
   ObjectTemplate.SetCopyLinksCount 0
   ObjectTemplate.SetActiveAcceleration 0/72/0
   ObjectTemplate.SetPassiveAcceleration 0/7.7/0
   ObjectTemplate.SetInAirAnimOverride GrenadeAxisFire
   ObjectTemplate.BurstFrequency 30
   ObjectTemplate.Damping 0.0
   ObjectTemplate.SetTrigger PIAction
   ObjectTemplate.AddToNegativeMask Climbing
   ObjectTemplate.AddToNegativeMask Crouching
   ObjectTemplate.AddToNegativeMask Swiming
   ObjectTemplate.AddToNegativeMask Lying
   ObjectTemplate.AddTemplate e_RocketPack
   ObjectTemplate.AddTemplate e_RocketPackDefault
   ObjectTemplate.DefaultEffectTemplate e_RocketPackDefault
   rem ObjectTemplate.startEffectTemplate e_MustangFire
   ObjectTemplate.ActiveHeatIncrement 2.25
   rem ** I think PassiveHeatIncrement should be kept to 0.0 **
   ObjectTemplate.PassiveHeatIncrement 0.0
   ObjectTemplate.CoolingFactor 0.07
   ObjectTemplate.ActiveEffectPersistancePerFrame 0
   ObjectTemplate.LoadSoundScript Sounds/RocketPack.ssc
   ObjectTemplate.SetInAirAnims Lb_RocketeeringIdle Empty
   ObjectTemplate.OverrideAirMovementInhibitations 1