Still using just the duvet cover, I did put on a bedspread last week as a couple times I woke up in the early hours feeling a bit chilly but the last couple of nights have had to throw it off because it's too warm lol. My OH sleeps under his winter weight one all year, pulled right up around his ears!
No central heating here either, I don't like hot bedroom and my window is nearly always open to some extent.
Luckily my duvet fits in my washing machine, I usually give it two washes giving it a good shake and turn around between them.