Alter (transform) certain data points

[jazzmonger]

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?