Try to understand the theory behind providing heat for baby chicks. Lacking down, they lose body heat, which is generated like us humans, through ingesting calories. Until chicks replace down with feathers, they will lose body heat faster than they can replace it by eating, according to how cool the ambient temps happen to be. So we provide a heat source so the chicks can regulate their body heat.
With ambient temperature as high as yours, your chicks are not losing body heat faster than they can replace it by eating, so their heat needs are going to be minimal as long as the ambient temps remain high.
Even with cooler ambient temps, chicks need to be able to wean themselves off heat beginning in their second week. So the heat source needs to be reduced as they develop feathers to help them achieve this. So we raise a heat lamp each week a bit more or lower the setting on the heating pad or heat plate.
By the time chicks reach the end of their fourth week, they have pretty much completed feathering out and weaning themselves off heat. However, many people fail to understand the purpose of providing heat to chicks and they continue to provide heat because they are afraid the chicks will be cold. This defeats the whole process of the chicks weaning themselves off heat and the result is chicks who are heat dependent and have problems acclimating to cooler outdoor temps when it comes time to move into their coop and run.
So, you've done well for your chicks by observing that they don't seem to need heat because your climate is very warm already. Now that you fully understand the theory behind providing heat for chicks, you can assist your chicks in weaning off heat instead of throwing up roadblocks by providing heat they no longer need.