My hummers like it anytime. How fresh must the nectar be for your hummers?

When I change the necture it seems like they don't touch it for 3-4 hours could it be too cold? I store it in the refrigerator.

That's probaly the problem. In the wild nectar is lukewarm. I don't have this problem since I don't store alot of netar because I mix the right amount for my feeder.

Ruby-throats love it cold.