I purchased my shade cloth from Charley's GH supply. It is silver and white. I also bought from them combination mist/ drip system along with a timer which has a built in program for misting.

That's so much for the quick response. I look into that.

Which percentage of shading did you purchase. I'm not sure whether to get 30, 40% or more. How do I know which one to purchase.

You might want to go with a higher shading coefficient. If you think it provides too much shade some days, you can always pull part of it out of the way. But if you get one that doesn't block enough light, you're stuck.

Do you think 60% shading would be okay. Also, should I only be covering one side of the greenhouse or the entire roof? Thanks.

From my experience in California, 30-40% shade offers little help in the summer. I have 50%, 60% and 70%, starting with the lowest in the spring, changing to the highest in the hot summer. Right now I have 70% on the west side and 50% on the east side. The amount of greenhouse area you cover depends on how much heat you need to prevent. For my area, I cover the roof and sides, especially on the south and west ends. Again, now that it is in the heat of the summer, I have all roof and sides covered, a full misting system, and a powered exhaust fan. I can keep the greenhouse about 8 degrees cooler than the outside with that set-up.

Forgot to mention that a.m. leonard (amleo) and growers supply both have reasonable prices on shade fabric, of any size and any density. To save some money, you can get the unhemmed, no-grommet type and just use poly clips. Attach to the greenhouse with "snugger tie downs", offered by both companies.

Thanks so much for your suggestions. I will check them out.