I had my Aircon installed in April and used Tien21 from Roldan. I had 3 individual units installed as the roofspace was large enough to take them all which was cheaper that a large single unit. They did a neat & tidy installation.
I could have got it cheaper or dearer but they did such a good job of fitting my lights/white goods that they gave me confidence (overall I would say they were mid price band). They did offer me expensive 'Panasonic' units but I talked them down to a 'Spanish' manufacturer Daiken which do seem pretty good.
During installation, they had to run additional power cables down the conduit from the roof which cost me ~€120 total from memory.
For keyholder I use Sparklecleancondado who have been good and helped with a few small jobs (socket moving etc).
Back out for some golf end May...can't wait for some sun!