lol, based on your prior post, I figured you had a hand in the a/c world, lol. I've been thinking of the barrier spray, just googled the solar fans too. My house has the ridge vents, but reading a bunch of stuff, I better check just to ensure they're not blocked. I believe my a/c system is a newer model, really need to look at it as I really hadn't. As for the vents, that was just another thought in my mind on the list of making sure I'm getting all the a/c I'm paying for. You do independent work or with a bigger company. I may hit you up off thread for a consultation/evaluation on my system if y'all offer that. My a/c seems to have good flow and blows cold. If I may need to look into a replacement, It'll take some saving as I have some other things going too. I am aware of how costly an inappropriate a/c can be. I have a home owner warranty policy, but would be my luck that they'd replace every nut and bolt on the system or have some crud company doing the work. Appreciate your info. I too am not stuck on name brands, rather performance.