The weak point of bedbugs is that they cannot handle temperatures greater than 120F even for a short while. So the best bet is to move furniture and smaller items like clothes and rugs, to a rented truck with a heater in the back. When the temperature at bed level reaches 120F, you are done.
At the same time, fumigate the empty building.
My mom tells the story when they were in New York with my dad training for WWII. The basement they rented from some lady had bugs of some sort, so they waited for a really cold day (it ended up being after Christmas) and took EVERYTHING out into the yard (rugs, curtains, etc.) and then scrubbed down the place.
The landlady came home and my mom didn’t want to embarrass her when she asked what the heck was going on. Mom said it was a custom she grew up with that just after Christmas they give the house a good cleaning.
Can’t remember if it worked or not!
So no worries, Global Warming™ will solve the problem.