hmmm ... do you mean how to build running stamina until it gets a bit cooler and you can actually run? I'm not sure what you could do to support that, hopefully someone else has some ideas. Maybe squats for the legs
Or do you mean how to get back to running towards that 10K you did before? If you haven't run for a very long while, it would be good to re-do the C25K programme, lots of people do .
Sounds tough though where it's so hot and your gym doesn't have aircon!?! Hope you can work something out. We have a runner from these forums over in Italy and it sounds ... facemeltingly tough.
It must be incredibly frustrating. And to have the combination of aircon in your apt but not in your gym!! I assume that you can't get a (fold-up?) treadmill for your apartment or that there's no other gyms that you can access (practically, financially, etc). Really frustrating!
There are tips for running in the heat, as long as you are sensible with clothing, water, sun protection etc, sticking with early mornings (evenings are hotter) ... you might find some shady routes ... of course there's still a limit to how much heat you can run in. There was lots of discussion about this over this summer here, as we had the heatwave. Good luck!
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