One of my units doesn't have central air but rather has a few AC units.

if there is downward pressure on rents due to oversupply, then it means the opportunity to buy at better price point must definitely be down the corner (the corollary would be to avoid buying in these markets for now)

Unfortunately, air conditioning is not considered a health or safety issue in Texas.  

Yeah well NorCal is literally ON FIRE.. the air is so smokey, But, that would be off topic. 

I'm 10 miles in the air looking at your situation, so take it with a grain of salt.

Perhaps you can also pressure the real estate agent regarding the delay in closing.

It's good in some ways because there isn't as much pressure.

Current furnace was installed in 1987 (very old) and it’s forced air furnace (no radiators)Any recommendation on what I should do?

Macbook AIr is awesome for the price.

Or, they will develop a box that just sits there and blasts out cold air into a house which will reduce the summer heat to a much more livable temperature.