I have heard some siding options can make a house more energy-efficient. Does vinyl siding actually help with that?

Definitely — especially if you choose insulated vinyl panels. In my experience, adding vinyl siding can reduce drafts and help maintain indoor temperatures better than older or non-insulated exteriors. This page really explains the energy benefits and options available for vinyl siding https://familysiding.com/services/vinyl-siding/. Iti s a simple upgrade that can make a noticeable difference on heating and cooling costs.