If you are wanting to use it for pre-preg curing, which I'm assuming you are given you want a vacuum port, then you really need to get a PID controller, as standard household ovens don't have very good temperature control at all. Really a PID controller would be ideal for whatever process you are doing, and dead simple to install (though you may wish to hire a qualified electrician to do the wiring). However if all you are doing is elevated temperature cures on infused or wet-laid parts, then a household oven works just fine.