Dealing with extreme temperatures During this current heat wave I've been struggling with heat related discomfort in my sits. (A/C isn't an option at my home) Any advise on dealing specifically with this, I'm sure the people who mediate in the east have it worse.
We must learn to thank the physically uncomfortable things in life, because it is a great teacher. 

The retreat center in my city is right beneath the primary flight path to a busy airport. New meditators on their first retreat often get very irritated by this - because not only is it hot and sweaty, especially if they aren't from India, but they didn't sign up to deal with this infernal din from above.

We may not realize it, but we often live in our thoughts and memories and not in the present moment. Our memory of comfort is what comes in conflict with the present discomfort, not the physical pain itself, since it is the mind that gives meaning to pain.

When irritation swells up in us we must immediately thank it, and investigate it - who is getting irritated? Where is the clinging coming from? What exactly is uncomfortable? What is getting hurt? Is it our senses or our expectation? When exactly did the irritation begin? What happens to our attention at the moment of irritation? When does it end? How soon does it begin, and how soon does it end? What is its nature? Is it constant or does it arise and pass in waves? Can one see the three characteristics of anicca, anatta and dukkha in the irritation? and so on.

When the first aircraft flew above me, I was mildly irritated by it, but seeing that this was a great teacher who had come to guide me, I began to practice loving kindness towards the passengers in every aircraft that flew above me after that. Soon it became a habit, and so while there were some who would audibly sigh and hiss at the aircraft, I would be enveloped in a warm glow of love several times every hour.

It isn't the physical reality but our reaction to it that matters.