Many studios have kilns located in areas without environmental controls and poor airflow (This is a fancy way to no air conditioning.), which causes the ambient temperature to be well above 110°F... a.k.a. high heat! This is especially true for those us of with kilns located in the garage. This is hard not just on the relays but also on the digital controllers.
To counteract those high ambient temperatures and improve the lifespan of your controller, we suggest using a fan to blow air across the electric components. It doesn't need to be a large, industrial fan. Just a small, four to eight inch fan on low speed will be very effective. We use a personal desk fan and it works perfectly