Alter (transform) certain data points

[jazzmonger]

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I have a tuya ac unit that throws out anomalies when the temp reading is under 61 degrees.

I tried the filter map but it's averaging data values resulting in incorrect data. Trying to remap those values doesn't give me the desired result.

I actually want to "replace" certain data values less than 20 by adding back a constant value: If datapoint < 20 datapoint + 45

Is this possible? Or do I need to create some sort of template sensor?