Installing bathroom ventilators to cool down an appartment

[StevenLe]

Hi, I am planning to install bathroom ventilators on existing ventilation grilles. How much degrees temperature will the appartment goes down, if I install electric  ventilators? (where all flat rooms facing sun all day very bad air circulation like a greenhouse, stay near 30°c even all the night, no heater needed in Winter but hell in Summer). 

[ProDave]

Where abouts are you?  No heating and overheating even in winter does not sound like any part of the UK I recognise?

 

Extracting air on it's own will at best only lower the temperature to that of the outside air being drawn in to replace it, which if it's 30 degrees is still going to be hot. 

 

[StevenLe]

My place is on corner house facing all day sunlight front of open space, a square with 5 streets passing (noisy trafic also night).
4 very tall windows from room roof to floor, is too much surfaces to cover costs for install shutters?

all 4 windows are facing same directions, 
whereas 2 ventilate holes are positioned highest near floor roof, behind back of the house,
-1 is in bathroom passing behind heated sleeping room, 
-the other in toilet room next to entrance, passing behind heated living room.
when open entrance door, cool air circulate, if not opened, bad circulation even all windows opened, 
sadly cannot leave entrance door open all night for security reason.

also note that both ventilate holes show bad air circulation, we measured by devices, 
therefore, thinking of forcing air out by electric ventilators, 
if this solution cooling down room temp enough?

[Nickfromwales]

1 hour ago, StevenLe said:

Hi, I am planning to install bathroom ventilators on existing ventilation grilles. How much degrees temperature will the appartment goes down, if I install electric  ventilators? (where all flat rooms facing sun all day very bad air circulation like a greenhouse, stay near 30°c even all the night, no heater needed in Winter but hell in Summer). 

I tried the same in my boys attic conversion, but it only improved the air quality and did nothing to move the heat. The problem is, to move air out you need to allow it in somewhere, so an equal sized vent or window on the ground floor of a multi storey dwelling ( coldest point ) with no closed doors between the two would be the only thing that would have any impact whatsoever. Also, if the outside temp is high, it’ll just pull that in too, so may well exacerbate the issue. 
I resigned to paying a few hundred quid for a free standing air condition unit which has a 160mm vent to atmosphere. That is great, and will drop the room to 16oC. 
Forget wasting money on fans, just get air con if it’s that unbearable. 

[tonyshouse]

Insulate and shade windows externally 

[StevenLe]

Since the bedroom is most important to cool down is a suncreen only to this one room-window enough by keeping closing this room door well? is it ok for no shutters for other 3 windows (in living room and kitchen)?
-for releasing airco heated air out, what are other solutions, since it is not allowed to make big hole for pipe/hose out of the wall?
-which is most efficient and how much these 4 comparaison pricewise : shutter, or sunscreens, or water cooling machine(I have), or airco?

[StevenLe]

We would like to use the option of an air conditioner with a discharge pipe. The problem is that we are not allowed to make a hole in the wall. That is why we are thinking of letting the exhaust pipe discharge the warm air through the ventilation grille (bathroom or toilet). Does anyone have experience with that ?