@JamesPa Hi, it's my first winter with a heat pump in my new build so all a bit new for me. I don't have a battery, not even sure how they work and if it's worth it for me. I actually want to know a bit more about it, are batteries worth it and expensive?
What does OAT mean? I'm not sure if it needs to be that high, it was set by a heat pump professional. Yes, I think it's 24x7 with WC. Trvs are all set to max all over the house.