Dig Bick Disease

I have that One it doesnt tell me my GPU temp

By the way could u give me a good software to check CPU and GPU Temps. My software just says HDD and CPU Temps

Mine reaches 85-90 when im extreme gaming and i experience lots of FPS Drops. And i live in a hot weather and i dont have an AC. Idk how to keep my house temps cool besides fans

So i have an ASUS K501U and it was really nice when i bought it but now it heats so freaking much it is absurd. The specs are an i7-6500U, NVIDIA GTX950M, 8GB ddr3L 1633MHZ (not sure) and 1TB 7200rpm hard drive. When im on idle my laptop is chilled (around 50ºC CPU), but when i go gaming it reaches 70-80ºC and this is weird because i have a laptop cooling stand from cooler master (ergostand 3) and even when i Incline it the temps dont lower they just stay the same. The computer has 1 year. Do you think it has gathered a lot of dust inside? I really want to open and see but im afraid to void the warranty if I do it you know. If you can give me any more tips on how to keep my laptop cool please do it.