My whirlpool dryer is 16 years old and some rust started to form on the screen of the heater box. Appliance parts pros had the lowest price and lowest shipping. Once you take the back panel off the dryer it's straight forward for most brands. Take the heater element box and thermostat off the heater box, then take all the screws out holding the heater box to the dryer. Whole thing will take an hour start to finish by the time you start pulling the dryer out from the wall.