I recently had my 40-year-old oven recalibrated. The technician set the temperature such that when I set it to 350 degrees, a thermometer hung from the very top of the oven reads 350 but the temperature at the middle rack is closer to 275.
My question: when a recipe says, bake at 350, does that mean that the oven should be set to 350, which takes into account that the temperature in most of the oven is actually lower? Or does it mean I should turn the oven to 425 so the middle of the oven actually is 350?
A side question: do all ovens exhibit this much internal variation, or is this just because I have this ancient underinsulated oven?