Hi Mary
I believe AEA, the administrators, will provide another remote, at a cost (about 40 euros I think). But not sure about the AC remote - if the previous owners say they never used the property, have you checked all the documents for the appliances, etc.? Maybe the remote is tucked away somewhere. If not, you may have to contact the AC unit suppliers. Someone else may have a better idea.
I can recommend someone to install sky - PM me if you want his details. I can say that friends of ours who own here brought over a spare box they had and wired it up themselves, no problem - maybe you have a spare box??
If you need any help, don't hesitate to contact me!