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in Problem solving
They do need warmth and moisture- are they new tubers this year?
Mid-April is only 3 weeks -just be patient
They can be quite slow to sprout, and moving them out of the warm house into the colder greenhouse won't help. Are you sure that you've planted them the right way up, with the dip uppermost?
Is their compost moist rather than wet, which could cause rotting?
Were they very dry when you bought them, e.g., from a supermarket, which might slow them down?
I agree with Geoff - it's not that long yet, give them a chance.