It is time to do some due diligence. Dig around on the net and you will find a few apples that will work in your climate. Only problem is that you are asking the wrong question. It is not a matter of tolerating your heat, rather, you need an apple that will tolerate your lack of cold. Apples require a minimum number of chilling hours to bloom normally. Most apples will be unhappy because you have relatively mild winters.
Do a google search for "low chill apple" and you might find a few things to read.
DarJones
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