Attic exhaust fan suggestion?

I have a finished attic/loft which is a bedroom in a 3 story home. It is used as a bedroom, and suffers terribly from exhaustive heat in the summer. The house has A/C, but it seems to really work hard to cool that room. The whole room is insulated on all sides, except under the floor since it is finished below - but walls and ceiling are insulated well.
Some of the homes around me have attic exhaust fans. Not the whole house type, but rather the small 1' x 1' square 5" high fans that exhaust the heat from the attic. I'm wondering what the general consensus is on how much this would help? Would it be a worthwhile purchase, or is there another way to increase the comfort in the room?
Thanks all for suggestions and wisdom.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

This is Turtle.
I have two of them on my house and when i just had 1 of them and it stopped working. My 3.5 ton cooling system would not keep up in the 100F + weather. I put two back and the unit does fine now. Worth every penny they cost and Low's or other store cost about $39.00 to $69.00 .
TURTLE
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Peter Langevin wrote:

If you are talking about venting the finished area, then I would suggest a fan would be in order.
If you are talking about venting a non-living area, not part of the finished area, not insulated from the outside, I suggest that you may be better off talking a good look at the passive ventilation that is there and deciding if that can be improved. Most of the time a better passive system is to be preferred over an active system. That would include increases in both high exhaust openings and low inlet openings.
There are exceptions to this. I some areas, generally of high heat, even the best passive system needs some help. I do suggest that you take some time to engineer the active system. Adding a fan that is just going to pull air from a near by high vent and exhaust it, may actually decrease the efficiency.
--
Joseph Meehan

26 + 6 = 1 It's Irish Math
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.