Heat travel up.

You don't leave the windows open permanent. Some scenario

- When first reach home, open up the windows and door, let the heat in the room escape out before switch on the a/c
- When first reach home, open up the higher windows, switch on the a/c, the hot air will move out, this of course depend where the windows, if its very close to the a/c than is not ideal. If further away and higher, the heat cumulative earlier will escape faster.

My practice, even in hot day. When reach home in the evening, I switch on vent fan in my room, open the windows. Force the cooler air from outside to come in. Unless outside air are warmer (very unlikely), only than I will switch on the a/c.

If room not occupied, just open small gap in the windows let the heat out.

No such things as 5 phase. 5 cores wiring yes.

The way to save the bills is reduce its dependency to the A/C, unless he/she need it because is running a home office, data center, entire house aquarium.

Usually for server room, it operate with 2 to 3 A/Cs running at specific interval using external timer to trigger, and if one fail, it have to manually switch over, or another method is making the switch over time shortest possible say 90mins per A/C, this will help reduce the server failure if one A/C failed. And a monitoring system is put in place to detect voltages, temperature, humidity, and motions it trigger the alert via SMS and Email. I setup few of these.

The fire suppression system is also another big cost, need waterless system, all depend what equipment in the room.

Normal A/C can do it, it have a switch to use as manual switch on/off. A/C installer will know how to set it. Is all trigger back online when power resume. Same as for server, when power failure detected, it will power off after it passed the pre-configure the wait time.

It won't la. Because the power switch on at random time.

Actually don't have to worry of resume, because when the power trip, and you want to leave the room/house, just off the main.

I am reference to the Ac only. Fridge sure need to auto start.

Have to understand installer is not at their control, you can always get own installer. Same goes to legend SS2 many say they are shitty, I bought almost all my household appliances from them and have no problem, because I dont use their installer.

If you want to have company that provide own installer go bigger chain shop and confirm with them is it their own installer or outsource.

All installer will say they are good. Non will say they are lousy.

This post has been edited by weikee: Apr 12 2015, 12:23 PM

Well, you know some people just don't have numbers to proof, just like saying non-inverter AC is noisy and inverter quiet.

Use 23 instead 25 is not cold. And who say is guaranteed saving? It only claim saving up to 40%

This post has been edited by weikee: Jun 12 2016, 06:24 PM