Yes adding a top can certainly reduce evaporation..
However.. realize that gas exchange (oxygen/nitrogen,etc...) is pretty critical in aquariums so there is a point where you can be causing more problems than you are solving..
But if you have a sump with a skimmer down there then thats likely enough exchange and you can slap a lid on the tank..
I'm not sure if there is any real data/experiments on how tight a lid can be before it causes problems..
I always run with no top and just accept evaporation for what it is..
Evaporation also helps with removing heat from a tank (if thats an issue) and reducing evap will increase temps
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