Ace's thread about the new AC unit, and Todd's comment about Radiant Attic Barriers got me thinking.. We just bought a house back in Jan. 2050 sq/ft single level home in the central valley (California). With recent temps this week tipping 105-110 our AC unit (which, is fairly new, but, runs constantly to even attempt to keep up with the temp of the house). Its tough just to bring it down a couple degrees (ie from 82 down to 80). So without replacing the entire unit (couple grand I dont have), Todd's comment about Radiant attic barriers caught my attention. So I'm basically looking for some opinions on what I should do.. Our central duct work is all in the attic, which is flippin hot of course all summer. the Radiant barrier looks to cost around .14 sq/ft for a decent branded one (ie. not some paper thin crap). I get a .10 rebate from local power company (woohoo!). Any reasons i shouldnt do this? I'd think it would cut down on the use of the AC in multiple ways (keeps house cooler with attic being cooler, and the duct work isnt exposed to that extra heat, even though the ducts are insulated). Would be roughly $500 (including shipping) to do it (i'd install myself, seems pretty simple, just tedious), and should get about 2/3 of that cost refunded back to me. Also, what about whole house fans? anyone have any good recommendations on one? looks like i need about 3x my houses sq/ft in CFM per what i read. So roughly a 6,000 CFM unit. Direct drive or belt? (I'm leaning towards belt). Our evenings generally (except in this heat wave) cool off in the low 60's during the summer and we regularly leave the house open at night. So I'm leaning towards this (plus, i get a $75 rebate on that too). But they range from a $125 window mount option to $1000 and higher end units. I want best bang for buck that i'll get "back" quickest. lol. (and that will last). Thought about also a gable fan or two.. havent totally decided on that one yet. with the barrier it might not be all that important as there are ridge cap vents plus gable vents (3 or 4, counting the opening into the garage). Not sure how much energy savings would be. Not sure how I'd be able to calculate it, but it seems like it would be a smart move in the long term. Thoughts? suggestions? other options?