Since the temperatures in Karachi, Pakistan seem similar to Texas I'd venture to say the temperatures inside a Greenhouse would be between 100F (38c)and 120F (49c) in Summer. I can't imagine keeping vines of any sort in there under those conditions.
Try hoyas, they come from Asia and Australia, they enjoy warmth and humidity and are vines, not the fastest growers until they are established. The flowers are usually scented and lovely.