Aircon charges through summer

hi all, just wondered if anyone knew what you would roughly expect to pay iberdrola for running aircon units through the summer months ?

We pay around 25€ a month when the apartment is empty. We leave the fridge freezer, internet, weather station and security camera on all year round.

When we are there in the summer, prices rise to around 45€ per month. This is not solely down to aircon as we have TV, hot water, lighting and cooking costs too. Fridge Freezer will also be working harder cooling all the beer, cider and wine. We do use the aircon a lot though, even during the day. We have 3 aircon units.

Thanks again Duncan, a font of knowledge again :-)