Humidity above 30% will minimize static build-up. But it is often lower than that on very cold days and acrylic-based carpets naturally make it worse.
You can buy anti-static sprays by the gallon and also anti-static carpet squares from industrial companies like United ESD Control. »store.unitedesd.com/
You can also help cats and people to dissipate static build-up periodically:
- conductive scratching posts for cats
- metal tape on some walls for people to touch
You can buy grounding kits used for ESD straps/mats and hook up to the metal tape and scratching posts.
There are also air ionizers but they are quite expensive.