You can make the Search Area's effect be an Apply Behavior type that applies a second behavior which has a maximum stack count of 1. For the second behavior, you can either A) give a health regeneration bonus (easier, but the healing is constant) or B) give a periodic effect of Modify Unit (slightly more complex, but can heal x% of a unit's total health per tick instead of a static value).
@LegendsOfHyrule: Go
You can make the Search Area's effect be an Apply Behavior type that applies a second behavior which has a maximum stack count of 1. For the second behavior, you can either A) give a health regeneration bonus (easier, but the healing is constant) or B) give a periodic effect of Modify Unit (slightly more complex, but can heal x% of a unit's total health per tick instead of a static value).