I never disinfect. Ever. I figure that chicks treated like they are made of fine china are likely to grow up to be delicate, susceptible and not tough.
I make every effort to give them warm, draft free place to live. I sweep out old bedding and add new. I dust if the place is dusty (my hen house is always dusty!)Clean water, good food, room to get in and out of the heat as they feel the need. But beyond that, those chicks will have to live in the environment that I have, so they better find a way to deal with the various bugs and germs they might encounter.
It's one thing if you have had a known disease sweep through your flock and kill everyone. Then you definitely have to disinfect. But if that is not the case, you might consider that chicks are not as delicate as we are often lead to believe. That a good shovelling, sweeping and airing out, fresh bedding and warmth might be all you need to worry about. Good luck with whatever you decide.