wow i was looking for this sort of thread too ..

after reading from the beginning i think my house low ceiling is definitely one factor causing heat. any suggestion how to counter this ?

My new house used to have the same issue - damn hot and warm especially during the night. So I decided it would be best to open up my hall windows (no sliding door), kitchen window and downstairs room window every day after I wake up.

Ever since then, the ventilation had improved and the heat had reduced.

Do you mean open every windows?

Not every windows, probably the first one or middle one would do for every portion (hall, kitchen, etc.).

i installed two exhaust fan in the attic in addition to a few in the ceiling board. really helps the hot air move from the ceiling into the attic and out of the attic totally.

recommended.

My 1st floor family hall had an attic window but i sealed it and put another plaster ceiling about 10ft height.. The hot air maybe trap inside between 2 plaster ceiling?

yes, please get a KDK exhaust fan (about RM120 to 140), and get an installer (RM50 to RM100) to fix it. one in the attic window, and one in the attic proper. i actually have two as well. in the afternoon, i switch on for a few hours, and afterwhich, my house is much cooler. Then air-cond don't have to work so hard.

Exhaust fan electricity consumption is minimal (maybe 25watt) compare to air-cond (which is 1,000 to 2,000 watt), so this is cost effective.

Attic windows is to allow hot air escape, now you seal it sure house is hot lah.

This post has been edited by weikee: May 27 2017, 11:38 AM

Install roof vent fan to push the hot air out, I assuming (most house do) the roof have opening that allow hot air to escape.

http://www.greenbuildingadvisor.com/blogs/...or-do-they-hurt

anyone got a contractor contact who is sifu in this kind of things ?

This kind of thing require engineering sturdy and simulation.

Hi, the exhaust fan you mention is installed on the plaster ceiling or ceiling right? Do you need to add another ventilation turbine on top of the roof or ceiling exhaust fan is sufficient?
Because i not sure does the ceiling exhaust fan need to work together with the ventilation turbine on roof top?

The proper investment is
1. 2x Lomanco 14" turbines. All aluminum construction. It can be pushed with winds as slow 1.5km/h on account of its weight. One turbine services 500sqft of roof area. My old place uses 2 because my old house roof is 1000sqft. Per turbine they'll supply 4 piece of air vents. In hindsight I prefer a closable round air diffuser vent for bedrooms. This can be closed when AC is used and open to promote air circulation when it's not.

2. mosquito netting on the upper floor which would allow air to come in minus the insects. This to me is a must. If there's an openable small window in the ground floor front with a grill add a mosquito netting too to help no3.

3. Ceiling extractor fan in stairwell, bedrooms. This draw cold air in during the night time. You'll notice that in the night, the outside is cooler than inside the house. Having ceiling extractor fans with no.1 have an immediate difference in the night time after the bedroom air is extracted into the ceiling space drawing the fresh ones in. Optionally install each point with Hager 24 hour timer so that they turn on at 6pm and off at 5am when the air is coolest. In the day time it's already hot unless it's raining, it's not advisable to turn on. This is to keep the house as cool as long as possible.

4. 2 wall extractor fan at the back. This pulls air from front to back.

5. Wall or glass mounted extractor fan in the toilets. Never vent toilet air into the ceiling space for goodness sake.

No.1&3 promotes stack ventilation - hot air out and cold air to replace it from the bottom.
No 4.&5 promotes cross flow ventilation.

This post has been edited by halcyon27: Jul 17 2017, 09:42 PM

Top Floor Plaster Ceiling -> exhaust fan [i have 5; including in 2 toilets]

Attic / Roof -> exhaust fan (vertical / horizontal - depends where is convenient based on roof design). [i have 2]

strongly recommend at least 2 exhaust fan (i use KDK 12" - cheap n reliable) and another 2 at the Attic / Roof (also use a modified KDK 12" to punch through at a side wall at the roof)

no turbine for me because i have solar panel. turbine shadow disrupt my electricity production.

So you need both exhaust fan for ceiling and at the roof to work efficiently lar.
If only exhaust fan on the ceiling won't be enough?

So you need both exhaust fan for ceiling and at the roof to work efficiently lar.
If only exhaust fan on the ceiling won't be enough?

I have been thinking of installing the ventilation turbine, but worry about leaking issue after installed....mind to share any leaking issues?

Very remote chance and only if turbine cannot turn which tend to happen to steel made ones rather than aluminum. The Lomanco ones hardly and if it does only a few strays. It's the way the vanes are curved which tends to swing the rain away rather than suck it in.

All that being said, never install in such a way that it becomes an intake and that only happens is it's installed low when it should be at the top, right under the roof ridge caps.

This post has been edited by halcyon27: Jul 23 2017, 05:53 PM

It was heavily rain yesterday afternoon. At night, I feel my living hall down stair warm like Oven if compare to the temperature outside the house. The temperature outside the house is so pleasant and nice, I guess below 30 degree.
The upper floor also not so hot compare to none rainy day.
I am wondering why living hall down stair, especially the center of the house feel so warm, just like in the Oven.
Any thought ?

possibly heat built up unable to escape.

1. try external shading device (roof awning) or solar gard film at window
2. open windows front and back for cross ventilation.
if no improvement may be install extraction fan to draw trapped hot air out and replace with cooler air from outside.
Or install turbine at roof above hall since hot air trapped in middle of house.