How do you keep seedlings warm?

To keep seedlings warm, you can use a heat mat designed for seed starting, which provides consistent warmth from below. Placing seedlings in a sunny location or under grow lights can also help maintain an ideal temperature. Covering seedlings with a plastic dome or clear plastic wrap can create a greenhouse effect, trapping heat and humidity. Additionally, avoiding cold drafts by positioning them away from Windows or uninsulated areas can help maintain warmth.