Peace Lilies

I put all our indoor plants outside for the Summer, including a peace lily, however I don’t do it yet, too early.May would be about right, but keep an eye on the weather.
Some I put in shade, others in sun, the peace lily goes in half shade with a bit of sun. Tender leaves can burn, so a bit of shade is good.

I have 2, neither of which have "flowered" for ages

I have given up on them, 3 have died

The largest of these was sent to me by my two youngest daughters when I moved here end of October, last year. Since then it has grown a great deal and has never had less than five flowers on it at any time, sometimes 8 flowers. It lives mainly on a small table just inside the patio windows. The other two, - well one was a tiny plant as part of my Mothers Day basket of flowers last year, all the other flowers in that faded and died, I transplanted this and it has grown a great deal,but as yet, no flowers, The third, I purchased - again as a tiny plant - nearly a year ago, this also has grown,but no flowers. Even without flowers, they give a lovely splash of green, and are so good in the room for getting rid of pollutants.

I have 2, both given as a gift when we moved to this house 2 years ago, and both are doing OK.
They're on a SE facing windowsill, watered twice a week.
I'm surprised because I've never been good with indoor plants.
I didn't know they were called peace lilies.