Why do my spinach seeds not germinate?

I bought spinach seeds online along with one of those indoor greenhouse boxes hich allow 36 seeds to grow. I am growing kale, jalapanos, onions, tomatoes, and trying to spinach but I have not seen any signs of germination after nearly two weeks of growth. I looked on the package and it said it should only take 7-... show more I bought spinach seeds online along with one of those indoor greenhouse boxes hich allow 36 seeds to grow. I am growing kale, jalapanos, onions, tomatoes, and trying to spinach but I have not seen any signs of germination after nearly two weeks of growth. I looked on the package and it said it should only take 7- 14 days. I did some research and it says spinach seeds need cold soil to grow. Is that true? the seed packet said i can start seeds early spring and late summer to get two harvests. Maybe the germination needs to be in cooler weather? Its in the 60s where I live right now. I can start over and leave the window open so it keeps the seeds cooler
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