Is there a word that is equivalent to handicap but doesn't imply a negative effect?

Imagine a scenario where the default value for a temperature is 20°C. Is there a word that you can use to say that if you do X you add 2°C to that value, if you do Y you minus 7°C to that value and if you do Z you add 1°C.

I want to explain that `for each action you apply a ...'

I can think of two words that are similar:

You could say you apply a handicap - as you would in golf

Or you apply a multiplier

The following question :What is a word similar to "multiplier" but for addition (or subtraction) suggests addend or subtrahend but again this implies a positive or negative direction.

Solution 1:

An adjustment:

• A modification, fluctuation, or correction: an adjustment in the consumer price index.

(AHD)

Solution 2:

I suggest you use "a correction factor" for the desired temperature.

For each action you apply a temperature correction factor.

• A correction factor is any mathematical adjustment made to a calculation to account for deviations in either the sample or the method of measurement.

Read more : http://www.ehow.com/facts_7268119_correction-factor_.html

Or, if your intention is not to correct an error, "a regulation" seems to fit.

• For each action, you apply a temperature regulation.

Solution 3:

Modifier

From ODO:

a person or thing that makes partial or minor changes to something

This is a common usage for applying changes to the outcomes of die rolls in wargaming and RPGs.