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Thank you all for the input.

oh wait it is on that chart...design temp is 35...same as Miami!

oofowf, that does sound neat! I thought that hydronic cooling would not be an option in my case because it's a wood framed building and condensation would invite moisture where it's not welcome, but maybe I'm wrong? HerrKaLeun, I'm not sure what the design temp but this chart shows...

Thank you for your input. I should have posted these earlier, but here is a link to some drawings & renderings. Thank you!

That is a good idea for the sleeping rooms, which are small. The middle level (living/dining/kitchen) is about 1100 sq ft all open with some ceiling heights of 10' so I'm a little worried about stratification. I also just prefer the radiant heat. I think radiant is not common here (southern...

Single Family Dwelling Thanks!

Hi Everyone, I'm an architect working on a 3-level SFD in los angeles, apx 2400 sf. As an alternate to forced air I'm considering combining hydronic radiators or baseboards (not radiant) w/ ductless mini splits. I'm also looking for someone to help to design the system. Thank you!

Shophound, I'm not sure I'm reading your critique correctly, but are you suggesting that ducts in general are problematic?

Shophound, thanks for your observations. I think I can design around the shortcomings you're pointing out: In every case this transfer would take place in a sealed duct located between studs, and would occur only on interior walls. In general I'm trying to keep ducts away from the exterior...

Thanks to everyone for your observations & suggestions. Seems like a conventionally ducted split system w/ two sets of registers is a reasonable way of dealing w/ the problem. It's wood frame construction so we can use wall cavities to send air up or down w/in each conditioned space. Drazen's...

Thanks for the feedback! Individual dx terminals...sounds similar to "ductless systems?" Looks like you're replacing ducting with plumbing (which makes my job as an architect easier). I think something like this would work for the bedrooms w/ compact size, but how about an largish open area w/...

I agree w/ the forum policy & thanks for the reminder...as an architect I understand and appreciate the need for paid professionals. I've solicited help from a number of engineers in my area and they're either not interested (single family) or they just want to run it through their manual j load...

Hi All, I'm an owner/ architect working on my own house in Los Angeles. It's a multi level hillside house partially buried: I'm planning 3 zones based on how I predict the house will be occupied. I'm assuming that a split system is the way to go but I really don't like the fact that cool air...