Setting quality thresholds?


I have performed some tests at work where I have collected temperature and effect data to calculate the so called UA value. This value is dependent on measured effect to maintain a certain temperature within a enclosure (eg building, box..) compared to the ambient (outside) temperature conditions.

I have collected data for 7 different units and would now like to compare the individual results and determine the “normal” expected UA value for manufactured units. What sort of statistical test should I start looking at? I am not very experienced in using statistics and appreciate any guidance on what I sort of tests would be relevant so I can do some reading.

Best regards,