Bedbugs don't do well with heat. In fact, they die. So if you have items you fear are infested with bedbugs that you can't launder, don't want to treat with chemicals, or if you just want to double down after using other eradication methods as well, get a bedbug-killing heater.
These are essentially just large, well-insulated compartments lined with heat-reflective material that connect to a hot air blower. When set up, many are large enough for full-sized luggage or even small pieces of furniture, while larger and pricier options can accommodate a mattress or a full wardrobe worth of clothing.
You plug the bug heater in, close it up with the infested items inside, then kill all the bugs with prolonged exposure to temperatures over 120º Fahrenheit.
Buy a ZappBug Oven 2 bedbug killing heater on Amazon for $349.99