Dear Uncle Vito,
Yes a greenhouse here in S.Calif., will certainly give you some
humidity.
I will say this first, the cost of the g/h is nothing, it's all the
equipment inside needed to
simulate a decent environment to grow plants that costs.

We live about halfway between LA & San Diego, 7 miles from the coast so
do get a little sea breeze.
Anyway, I have "opaque" polycarb on one greenhouse roof with clear sides
& still are covered with (shadecloth @ 65%) finer that the weaved stuff you
can buy at H/D etc.
My shadecloth lets in good light & cuts down the heat by 10 degrees. I had
shadecloth custom made complete with
grommets & reinforced hemmed edges.
I have read the the polycarb sheets are coated with a UV ray protectant
that only lasts 10 years or so? I don't know
how true this is???
I have gas heaters for winter, & swampcoolers for summer.
Fans blowing 24/7, misters & fresh air. Timers,
thermostats, autovents etc., all add up but in the end it's worth it as it's
my hobby. My hubby's hobby is cars!!!!
Costco has some good prices right now on kits. Don't forget
there's the foundation, raised sidings (pony rails) optional,
have gas, water & electric piped in. Oh by the way, my 1st green house was a
used SunGlo found for sale in the PennySaver,
paid $150 for 8 x 10 was able to build on to it at a later time.
One more thing, one summer the electricity went out at noontime & the temps
went up to 110 degrees inside the green house!
Had to open up & just wet the place down.
Good luck,
Cheers Wendy


"Uncle_vito" wrote in message
...
I am considering building a greenhouse for my orchids. It is the humidity
that I want/need. Living in Southern California, low temperatures are not
much of a problem.

Also, seems like most orchid growers in the area (Normans, SBOE) use shade
cloth or opal translucent polycarbonate panels overhead.

I am looking for a greenhouse kit with these opal translucent
polycarbonate panels for the roof. All that I can find seem to use clear
panels.

What are you folks using? Clear glass/polycarbonate with shadecloth or
opal panels?

Also seems that clear glass would make the GH hotter than heck, even with
the use of shadecloth.

Thanks for any advice.

Vito