I would use a propagation mat or heat mat under the seedlings in your greenhouse. These will warm the soil and help keep your seedlings warm. These are available with or without a thermostat for more control. I use mine even when I am starting my seedlings in my house. They make a tremendous amount of difference in the germination process. You get healthier plants which will grow faster. If using this in your greenhouse you will find that you do not need to have your supplemental heating turned as high as you would without the heat mat. You said you are growing your seedlings in your home, but you did not mention any light. You will need to use supplemental lighting, such as florescent lights when growing indoors.
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