To select a good, healthy spathiphyllum, look for a plant that fills out the pot. It should have new foliage emerging within the mature leaves. If you are buying the plant for the blooms, be sure to select a specimen that has at least one flower open because they do vary greatly in size and color. They are low light tolerant plants. If you can comfortably sit and read in the spot, the plant will do all right.
Winter sun is fine, but avoid direct afternoon sun in the summertime.
Keep the soil evenly moist all year round. Do not allow it to stand with water in the saucer for more than an hour or two. They are well suited to average indoor temperatures. If they are kept where it is warmer, be sure to keep the soil moist and raise the humidity around the plant. They need high humidity and should be misted daily or kept near a humidifier or on a humidity tray.