Air conditioning

Dear all,
I have been following your messages, and here i am asking for your
kind help.
I just want to buy a new air conditioning, and found many brands;
Union air, Miraco, Sharp, Power, even Hundai..etc. So, i would like
to know your experience regarding these brands, in terms of
reliability, after sales services and which one you recommend? I
really appreciate your help.

Another and last point, a friend of mine wants to whiten her teeth.
Do you know any respectable and professional place for that?

Wallahi your kind help is really appreciated,thank you,
Samaa