Diatomaceous earth kills any waxy shelled insect by slicing them open and this results in dehydrating them three days – usually less – and that includes bedbugs. It's incredibly cheap and usually sold in the pool section, the gardening section, or the insecticide section of big chains like Walmart, Lowe's, etc. you can also get food grade diatomaceous earth, which is slightly more expensive than eight dollars US a rather large bags usually costs, and is often added to foods in other countries not the US. The worst it can do to anyone is dry out their skin where it makes contact – that includes the family pets – perfectly safe
There's an over-the-counter (normally used as antifungal) health store type thing that can be taken orally safely and that kills any bedbug that bite anyone who's ingested it-- got to look for the name for this one, because it slips my mind the moment, so I'll get back to you on it.
Cockroaches eat bedbugs – they cannot coexist in the same environment. If you are currently treating your house for cockroaches, and fear bedbugs, stop for a little while and let nature take its course.
In the meantime, it's not necessary to cook your house.
The sprays don't work. The sprays are dangerous. The bugs develop immunities to the sprays over time.
Please don't put gasoline on your furniture(common home remedy in Trenton, which not only doesn't work, but is extremely dangerous).
I've got a longer list, but you get the idea.
Also, boil any loose fabric you fear they might have gotten into – that includes those large Afghan hand crochet/knitted family heirlooms type things that nobody ever washes. That was the only spot my friend overlooked when she first had to deal with them, and it finally ended.