I had a pelt on a Pentium D a couple years ago. It isn't really all that worth the trouble. Your temps will be fairly good, but as mentioned they suck up power. The entire room I was in would get a few degrees hotter.
I couldn't imagine using a peltier on an air cooling setup. It's just foolish. The peltier would heat up your case like no other. Your box would need so many fans, it would sound like a jet. This is assuming you're using a high wattage peltier. Using a weaker one just wouldn't make sense price/performance. You need a second PSU and a small one is still too many watts to be worth the cooling benefits.
If you lived in an apartment with utilities included, had a great A/C system and you don't mind burning all that coal, then I suppose peltiers are for you.
I couldn't imagine using a peltier on an air cooling setup. It's just foolish. The peltier would heat up your case like no other. Your box would need so many fans, it would sound like a jet. This is assuming you're using a high wattage peltier. Using a weaker one just wouldn't make sense price/performance. You need a second PSU and a small one is still too many watts to be worth the cooling benefits.
If you lived in an apartment with utilities included, had a great A/C system and you don't mind burning all that coal, then I suppose peltiers are for you.