Freezing temperatures for an iMac

I have an iMac i would like to leave in a summer house that will be unheated during the winter. Temps might occassionally get as low as 20F, but usually be in the 40s during the winter. Any problems?

I'm assuming this is an iMac with an LCD display. Here are some links to read:

How to Store an LCD in Freezing Temperatures | eHow.com
Would an LCD TV freeze if left in an unheated space

- Nick