Altitude, dry air, and your Bertazzoni
Littleton sits around 5,350 feet, and thin air changes how a gas range burns. Bertazzoni burners are often calibrated for sea level from the factory, so at our altitude you can see lazy yellow-tipped flames, delayed ignition, or a cooktop that runs richer than it should. Correct high-altitude operation frequently comes down to the right orifice sizing and air-shutter adjustment, which is a standard part of how we set up a Bertazzoni here.
Our dry Front Range climate is also hard on the oven door gasket and the burner seals. A gasket that has stiffened and cracked lets heat escape, which shows up as slow preheats and uneven baking. We check and reseal these as part of a full range diagnostic.