Meme7

Help! So I had a new furnace put in and the thermostat is off by 5 degrees from another temperature reader. How do you adjust the thermostat difference?? Back story last year issues with furnace and it was off by a few degrees they took off wall unit and push pin a button and pressed a few buttons but did not tell me how to do it so now with the new furnace in I have to adjust it back. It’s freezing separate thermometer reading 73 but I have to set C4 to 78 because it’s too cold.