LOL! Yep, OM I'm a firm believer in Murphy's Laws...ALL of them...no other "natural" law is more proven on a day to day basis, 'cept maybe gravity...

Yes, OM, the R factor will get you closer, but to do a complete "J-sheet" heat load calculation, there are many, many other factors needed to do a complete evaluation to get the exact heat load...I just estimated 10K BTU/H would be sufficient and added how to tell if it's too big or little after that, so if what he has doesn't work, at least he'll know whether to go bigger or smaller. Not pickin on ya...just wanted to give him some options on direction if it doesn't work correctly....again...Trying to help him overcome Murphy...LOL!! It's all good!

Hey OM...I never told ya this before, but I find the fogfognuggen stuff fascinating! Thx! We need more innovators like you!
PS Gravity is how us Irish Optimists tell when we've had too much to drink...