29 May '13, 5pm

What is an optimal HVAC strategy? #green

I continue to plan for my new home (Zone 3) and am now focusing on the HVAC system. Here is what I think I understand at this point. Let me know if I am off base. - Local code usually requires Manual J, but individual inspectors may or may not ask for evidence of one to issue a COO. - Most contractors do not perform Manual J calculations correctly, if at all. - A third-party HVAC designer is more likely to provide an accurate Manual J (at a cost of .50 to .75 per square foot). - An accurate Manual J may not matter. (I say this after reading that most systems are oversized and that there does not seem to be much downside in terms of energy or comfort when contractors follow their general "rule of thumb" for sizing.) - Manual D is probably more important in determining comfort and performance. - Most contractors don't perform Manual D calculations or don't perform them corre...

Full article: http://www.greenbuildingadvisor.com/community/forum/mecha...

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