Mine will flucate + / - 20-25 degrees.Also the digital readout is not close to the orobes from the Mavrick ET7. I have tested the probes in boiling water an they where good. I have had some spikes in temp to + 35 the setpoint. Things you see when sttting on a couch and remote thernoneter at uour side. When I add wood chips, they are dry and just a pinch at a time. Any better way to get control of the heat? Also I keep the vent open.