lol....my experience does NOT agree.
When I had my SWCG pool in California with a solar cover. We had to remove the cover anytime the water got over about 87 degrees for more than say 3 days. If not, the pool would be absolutely filled with algae. And, the same thing was occuring before we had the SWCG. I can't tell you how many times I would forget or get too lazy only to find the pool looking like a poorly taken care of aquarium. And the amount of chlorine could not combat it. The warm water under the solar cover was so idea of an environment that the algae would survive with the Chlorine at 6PPM and chlorine stabilizer below 50.

It makes no difference whatsoever IMHO or my direct experience.

I agree w/ barco; we have a SWG and solar cover but a w/ vinyl liner. When the air temp got pretty chilly this past week, we left the cover on for a few days to try and retain heat but had algae. The water temp has been in the mid 70's but we still need to open the cover daily to keep the algae away. Bummer...
joanneswimsct

Thanks for your honesty. I had my doubts about his answer. At least now I know to proceed with caution and make sure that cover comes off during the day.

Thanks Again.

I haven't found a pool cover that will last a full year on my SW pool without falling apart. I've had an algae problem too.