On Tuesday, December 29, 2015 at 8:09:18 AM UTC-5, CRNG wrote:
On Mon, 28 Dec 2015 22:37:21 -0000 (UTC), Boris
wrote in
8

Any suggestions?

The more insulation the better.
--

But there are diminishing returns and he's in SF, which has a
moderate climate. Between unfinished basements and the living
space typically isn't insulated. My basement is probably ~55F
all year long, in SF I wouldn't be surprised if a crawlspace,
with some limited vents, is not too much different.

Someone else pointed out that some more info on what the real
objective is would be helpful. He said that after replacing
carpet with wood flooring, it takes a lot longer to heat the
house. I don't think that makes much sense. I can see carpet
feeling warmer, but from a heat transfer perspective, I doubt
carpet vs wood is going to make much difference. Also, he says
he has a 20 year old furnace. If heating bills are an issue,
replacing that might make more difference in how much energy
it takes to heat the house than insulating the crawlspace.