Burglars broke into a building on a Corby industrial estate and also tried to force their way into the unit next door.
A unit in Alexandra Court on the Earlstrees Industrial Estate was broken into sometime between 6pm on Monday, January 5, and 9am the following morning.
The thieves took a computer and an air conditioning unit.
At the same time, efforts were made to break into a neighbouring building, but the thieves were not successful.
Witnesses, or anyone with any information about these incidents, can call Northamptonshire Police on 101 or Crimestoppers on 0800 555111.