Don't know if this will help on what you are looking for here is a link for you.
http://www.google.com/imgres?imgurl=http://davermfarm.files.wordpress.com/2009/01/azalea-encore-autumn-princess.jpg&imgrefurl=http://davermfarm.wordpress.com/2009/01/30/encore-azaleas/&h=1944&w=2592&sz=1963&tbnid=RnRYJNcn7WElFM:&tbnh=113&tbnw=150&prev=/images%3Fq%3Dimage%2Bof%2Bencore%2Bazaleas&usg=__GkcNdSIby5XuidpZt-fj0Jdj7S8=&ei=CWEJS7jvKpSsjAfhysT3AQ&sa=X&oi=image_result&resnum=5&ct=image&ved=0CBQQ9QEwBA

Hi Ron, freely admit I had not heard of this particular group of hybrid Azaleas. Given how hot it is where you are I would suggest that you get in touch with one of the suppliers and ask questions, lots of questions! Only buy if you are sure they will do reasonably well with you! The implication that they flower from spring to autumn, fall, is I think a little misleading... some flower in spring, some in summer and the rest in autumn. As they are hybrids they are designed to have lots of colour and flowers. Do you have a cool semi-shade area to grow them in? Oh and suitable soil?

To: Morgana: Thanks for the website, it was helpful. Dave implied that his Encore azaleas only bloomed in the fall and not for months as advertised by the company.
To: Moon grower: Thanks for your cautionary note. I have been writing down phone numbers of public gardens that have this particular type of azalea in its garden. I plan to call them and ask them what their experience is. According to Encore azalea's website, the azalea should be planted in sun to get the blooming. I think that my soil is marginal as it has a lot of clay. So that is another barrier to overcome. I am also considering purchasing a small number as an experiment before going too crazy with my purchases.

Thanks again. Ronelle

So far as I am aware all Azaleas need at least part shade... keep us posted!