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Posted

I came across this product that will extract the hot air from your home: https://quietcoolsystems.com/whole-house-fan/stealth-pro-x-whole-house-fan/

 

I thought it would be possible to rig up your own version using ducting (http://www.ductexcel.co.th/en/flexible-duct/)  and fan (https://www.artith.com/detail/Mi0zNg==/Type-AV-Exxx) 

 

In our house the ground floor is cooled by two AC units but the upstairs is very difficult to cool in the day time. We have insulation in the roof space.

 

My question is would this just suck out the cooled air from downstairs straight out the roof?

Posted

 

Is the "attic" vented? Do this first. After that I would install a rooftop ventilator (or a few).

 

I believe the "whole house" fans are generally used when the ambient temperature is nice.

Posted

In addition to roof void space venting, as mentioned,  along with insulation, whole house fan has its place as an optional feature to remove accrued heat from fixtures and furniture within the living space.  Always remember long-time TVF member, Naam, swore by it for early morning use, before kicking on the a/c units. 

 

Never pursued it myself, rather, installed a less expensive 18" window exhaust fan in the back bathroom.  Produces a reasonably good suction for our modest 3bed/2bath single story house, and also helps remove transient odors from the house - cooking, etc. 

Posted

Whole house fans work great in Denver, CO where the temps drop into the cold zone at night.  In Thailand night temps are almost the same as day temps and not what you want to sleep in if not located on a mountain.   The key to use is open windows on ground floor/closed on second to pull air through house and out through attic

  • Like 2
Posted

Yes that all makes good sense. I will look at installing a gable fan. It will require cutting a hole in the gable brick wall.

Posted
1 minute ago, pj123 said:

Yes that all makes good sense. I will look at installing a gable fan. It will require cutting a hole in the gable brick wall.

What kind of roof do you have?

 

Are your eaves vented?

Posted
6 minutes ago, Gold Star said:

In my last large 2 story house, it cooled so well at night, as I closed the windows and curtains during the day, I did not even need to use aircon.

Perhaps your location helps - most of Thailand will not cool anywhere near as much at night (23c average this week it seems).

Quote

Location:Chiang Rai

 

Posted
1 hour ago, Yellowtail said:

After that I would install a rooftop ventilator (or a few)

I spent Bht 26000 on two whirly birds. No difference whatsoever, even with my vented eaves and soffits, and a ceiling extractor fan. 

Posted

Some folks like their whirly birds, some don't. 

 

I went with a passive vent contraption from SCG, 4,900 Baht, mounted on the same kind of tile we have - pull 1 tile out, slot this thing in its place.   Only had one available, ordered up from BKK, said the un-powered model went out of production, but they could make more on demand.  Chucked the single unit up there to test through a rain season first.  So far so good, likely order 3 more before next summer.

 

ชุดกระเบื้องระบายอากาศ เอสซีจี แดงกุหลาบ - SCG Building Materials

 

 

Posted
2 hours ago, KannikaP said:

I spent Bht 26000 on two whirly birds. No difference whatsoever, even with my vented eaves and soffits, and a ceiling extractor fan. 

I bought two at 3,500 each installed and the difference is night and day. 

  • Confused 1
Posted
49 minutes ago, Yellowtail said:

I bought two at 3,500 each installed and the difference is night and day. 

He appears to already have had extractor fan if I am reading his post right - and ventilation of attic - so probably not much more they could do.  They indeed can make a big difference in ceiling heat transfer from a closed attic with cement board ceilings.  

Posted
1 hour ago, Yellowtail said:

I bought two at 3,500 each installed and the difference is night and day. 

What size are they. Mine are 22 inches. They rotate fairly quickly but no great advantage. 

Posted
3 hours ago, 55Jay said:

Some folks like their whirly birds, some don't. 

 

I went with a passive vent contraption from SCG, 4,900 Baht, mounted on the same kind of tile we have - pull 1 tile out, slot this thing in its place.   Only had one available, ordered up from BKK, said the un-powered model went out of production, but they could make more on demand.  Chucked the single unit up there to test through a rain season first.  So far so good, likely order 3 more before next summer.

 

ชุดกระเบื้องระบายอากาศ เอสซีจี แดงกุหลาบ - SCG Building Materials

 

 

I looked at these, but came to the conclusion that simply removing a tile would have the same effect, except no rain coming through.

 

  • Like 1
Posted
55 minutes ago, KannikaP said:

I looked at these, but came to the conclusion that simply removing a tile would have the same effect, except no rain coming through.

 

With a buttoned up Hip style roof, I went with this vent box on a tile adapter to simply let the hot air vent up and out naturally, without any moving parts in the way.  If I had a Gable roof, would of done what the OP plans to do. 

Posted
1 hour ago, lopburi3 said:

He appears to already have had extractor fan if I am reading his post right - and ventilation of attic - so probably not much more they could do.  They indeed can make a big difference in ceiling heat transfer from a closed attic with cement board ceilings.  

I understood he had no venting and no fan.

Posted
23 hours ago, lopburi3 said:

Perhaps your location helps - most of Thailand will not cool anywhere near as much at night (23c average this week it seems).

 

Oops, yes agreed if in Chiang Rai. I missed to say that my last house was near Pattaya. 

Posted
20 hours ago, KannikaP said:

Name of supplier/fitter please as I think I need two more.

I do not know the name, but I will talk a photo the next time I go by.

 

Do you know where the Lat Krabang Airport Link station is? 

Posted
11 minutes ago, Yellowtail said:

I do not know the name, but I will talk a photo the next time I go by.

 

Do you know where the Lat Krabang Airport Link station is? 

No, I am in Phitsanulok. Mine were Bht 5000 EACH plus Bht 1000 transport, then a further

Bht 11,000 for two men to come from Bangkok and fit them. I know I was probably ripped off. 

Posted
7 minutes ago, KannikaP said:

No, I am in Phitsanulok. Mine were Bht 5000 EACH plus Bht 1000 transport, then a further

Bht 11,000 for two men to come from Bangkok and fit them. I know I was probably ripped off. 

Two guys three days, meals and lodging.

 

 

Posted
6 minutes ago, Yellowtail said:

Two guys three days, meals and lodging.

 

 

No, done in a couple of hours. But of course, 5 hours drive each way plus fuel.

 

Sorry, just looked at the invoice........Bht 5000 for fitting, so the whole lot was Bht 16,000. 

Posted
Just now, KannikaP said:

No, done in a couple of hours. But of course, 5 hours drive each way plus fuel.

 

I thought it was further. I assumed a day up, and a day back. 

 

The shop that did mine is about 15 minutes away, they brought them with them and were done in an hour. 

 

They came back with and couple pieces of flashing the next day and stuck those on.

 

 

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