If its raining or windy, I don't turn on my a/c. Only on hot days or when there is a lack of wind.

I feel a/c is more drying for me. Noticed I have more mucus in my sinus when I wake up when I use a/c. Don't have such issue with fan.

Also fan is good for ventilating the room

Edit: BTW my electricity bill never exceed 350 units/month for 2 person household. Can save more if the wifey use the oven less.

This post has been edited by jeckyl: Dec 2 2014, 11:31 PM

They live longer because of better healthcare. Singaporeans and Japanese are kia si people. They were got eat the delicious artery-clogging food we Malaysians enjoy.
Also less risk of dying from swerving to avoid killing the mat rempits.

you're right. R-410A runs around 400 psi. R-22 is about 200-ish psi.
The high pressure would create pipe leaks, or would damage the compressor.

A/C recirculates the air in the room. If your house in located in a so called 'developed' area, the a/c just recirculated all the VOC, NOx and SOx for you.

If the air quality in your housing area is bad, it is time to move to another area. Not shut the window and enjoy the cool recirculating dirty air
Some may suggest you install air purifiers. Air purifiers are rubbish. They only filter particulates. Fine particulates below PM10, and molecules like NOx and SOx are not removed.

Basically if you are afraid of opening your window and breathing the air in, then time to stop breathing. (jk lar. don't actually stop breathing ok)

This post has been edited by jeckyl: Dec 3 2014, 04:39 PM

Yep. Some modern paints have functional chemicals added to catalyse the breakdown of formaldehyde and NOx. But all these are on the surface of the wall only. Doesn't affect the rest of the room.

Some air cond will have gimmicks to remove these components as well. Dunno how well they work.

I say just use the air-cond and enjoy the cool air. But if the weather permits, better to open the window and enjoy the cold breeze.
Cannot worry about in-door pollution so much. You will get high blood pressure like that lor.

You die one way or the other. The difference is air cond will kill you while you sleep comfortably. Worrying keep you awake and torture until you KO.
This is my Ah Beng logic. Pakai at your own risk