When you convert heat to energy, you need a difference in heat. Heat engines work when something loses heat, and that heat is converted into work – for example, you use a heat source to boil water, and then use the steam from that boiled water to turn a turbine (which is how a steam engine works)
With ambient air, there’s no difference in heat. The only way that warm air will cool down is if you bring it into contact with something cold, like an air conditioner – but that requires doing some work to cool the air down.
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