Is there any alternate of conventional Air Conditioner, which are costly and increasing green house effect?
One simple additions to DA01's list:
- Cellular light blocking blinds. I'm amazed by the temperature difference on each side of these, and you can pick them up relatively cheap.
Outside of various types of insulation, to block the heat, and ventilation ,to get any heat out, AC units remain the standard way to cool a home. That said, I'm interested in whether we'll see much progress in peizoelectric systems outside of the computer space:
There's quite a bit we can do to build homes better that DA01 summarizes very well, but it's a shame that hardly any of it is done in new construction today without custom building your home.
One other thought, I live in a townhouse with 3 stories. We switch our bedroom in the summer to be in the basement. If we were tight on space, we would simply be swapping the master bedroom with the guest room. In some very old, but high end homes that I toured recently, they had a front and a back so that they used the north facing rooms in the summer and the south facing rooms in the winter.
There is no real alternative to achieve the same result and pay less money. You can produce an air flow (fan of any kind) and help not to get to hot by using awnings but you will not achieve the same cooling result. You can try to buy ac units which use R410 coolant and are of inverter type, to ensure that the environment is less harmed.