Heater required in California rental?

[Jon L.]

We have an old duplex that we've had for over 15 years and it's never had a heater. The tenant just moved out and the new tenant is moving in but doesn't want a heater. Is there something I can just have him sign that says he doesn't want it installed? I don't care to install one either, since no one really uses it in Southern California. Is that legal to not have one even though the tenant doesn't want it?