House was built in 1923, and has no heating or cooling to speak of. While this is LA, between the spacious crawl space and utter lack of insulation, we tend to get the same temperature inside as outside. We plan to insulate the attic in the future, but we also want HVAC (both for our comfort and for resale down the line.) We'll be in the house for 10 years, though.
We've spoken to a few HVAC companies, and they're split on whether we should run ducts in the crawlspace or the attic. Pros/cons seem to be that we can avoid craning a compressor up onto the roof if we crawlspace it, and we can get better air circulation with ceiling vents instead of floors, but we'll have a noisy compressor on the roof, and we'll have to cut vents in lath and plaster ceilings, which risks big chunks falling out.
We have 2-3 foot crawl space, so I'm more interested in just using that, but I'm worried that floor vents won't do as good a job of circulating air. This is LA, so we don't have HUGE heating/cooling needs, but I don't want to lose efficiency with bad duct placement. Does anyone have any experience with heating/cooling in SoCal who can tell me what their experience has been like?