I have an Espar Model 3DL C and my thermostat control on the Espar is not very accurate and I'm thinking I may need a new one. The on/off works just fine, and when the cabin temperature gets really warm inside it does make the furnace go into a low blow mode, or even turns it off... so that mechanism is just fine. It is just that the lowest setting is only kicking in at the high 70s or 80 degrees Is anyone aware of an easy fix other than replacing the cabin control unit?