Yes, the bubble wrap solar pool cover is the ticket. We have a blue one, mid grade (3yr it think). It really helps keep the heat in on cool nights, in addition to solar heating during the days we're not using it. Also prevents water evaporating, so I don't have to add water during droughts, supposedly.
I'm not sure what's better, clear or colered. The cheaper grade covers don't last as long, and have a warranty period that shows. Ours is about 3 yrs old, and like everything I read on the Internet, I see the lil blue plastic circles (bubbles) in the skimmer. I'm not sure if ours will last til end of the year.
I haven't really taken care of it either though. The UV lift degrades it quicker, and I leave it on all winter, to catch leaves. I should probably get a leaf cover for that.
One big pain in the ass is the logistics of storing it. I bought a cover reel from Amazon, but now I'm stuck with a 20ft reel of bubble wrap on one end of the pool deck. The reel is almost a necessity though, my wife or i can roll it up solo. I'd hate to try and pull the cover out of an in ground pool, refold it, etc. without the reel.