Bed bugs can go for ages without feeding; the only real way to kill them en masse is extreme heat—e.g. the dryer. There are services that come and seal your house up and then essentially pump 125F heat into it, to kill the bedbugs (bugs @ 120F, eggs @ 125F). If suppose if your shed gets to ~125F in the summer, should be good. Point being: heat > time-since-last-meal for bedbugs. (unfortunately I am speaking from experience)
Edit/addendum: The bed-bug-sniffing-dog, while a very good boy, is a total scam.
Thank you for saying it. Bed bugs can go literally three years without eating. Using the mixed-toxin (different bedbug poison for each treatment, minimum 2 treatments) approach usually works, but the only way to definitely kill existing bugs and eggs is to get every part of an object to over 125f. AFAIK, 125f is the instant-death point. That is, any bug or egg the hits 125f at all is dead. Otoh, 113f requires 90 minutes of exposure before the bugs are killed, and the eggs require 118f for 90 minutes.
Edit/addendum: The bed-bug-sniffing-dog, while a very good boy, is a total scam.