Single unit for only 30m² sounds a bit excessive. At the house we have one split unit and it has ~170m² in two floors. On top of that we have electric heating in the wet spaces (shower, sauna, laundry room) and couple of radiators in the bedrooms (which are rarely used). Those alone would are just fine most of the year, but we also have a pretty big wood oven and a wood stove and while we could use only the heat pump+radiators it’s a lot cheaper to use wood during winter. Also warmth from the oven feels better, but only for heat it’s not strictly necessary until temperature drops below -25C.
In Spain people tend to install separate units for each room instead of one big unit for the whole apartment. Central units that let you control each room separately are quite expensive. It’s cheaper to install few small units and just turn on the ones you need: usually the one in salon during the day and the one in bedroom for the night. But that’s for AC because you can just let empty rooms to sit at 30 degree without issues. With heating it’s different, you can’t just let parts of your house to freeze. In southern Spain we don’t have freezing temperatures and I don’t know what people in other parts of Spain do for heating.
Actually you shouldn’t (if you can avoid it and I understand it’s expensive) let room just sit in 30C heat if you plan on air conditioning them later. When you are cooling a room, it’s just the air: the furniture, walls, everything has become a heat sink in 30 degree weather.
So you are better off keeping the room somewhat cool before you use it and go full cool.
In my experience you can keep the rooms somewhat cool just but closing the curtains. If they are shaded they don’t collect that much heat. The AC only has to run for couple minutes for them to be nicely cool. If the room gets really hot (I once ranted an attic that was like an oven during the summer) it’s hard to keep it a bit cool. Either the AC is running constantly or it gets really hot.
Single unit for only 30m² sounds a bit excessive. At the house we have one split unit and it has ~170m² in two floors. On top of that we have electric heating in the wet spaces (shower, sauna, laundry room) and couple of radiators in the bedrooms (which are rarely used). Those alone would are just fine most of the year, but we also have a pretty big wood oven and a wood stove and while we could use only the heat pump+radiators it’s a lot cheaper to use wood during winter. Also warmth from the oven feels better, but only for heat it’s not strictly necessary until temperature drops below -25C.
In Spain people tend to install separate units for each room instead of one big unit for the whole apartment. Central units that let you control each room separately are quite expensive. It’s cheaper to install few small units and just turn on the ones you need: usually the one in salon during the day and the one in bedroom for the night. But that’s for AC because you can just let empty rooms to sit at 30 degree without issues. With heating it’s different, you can’t just let parts of your house to freeze. In southern Spain we don’t have freezing temperatures and I don’t know what people in other parts of Spain do for heating.
Actually you shouldn’t (if you can avoid it and I understand it’s expensive) let room just sit in 30C heat if you plan on air conditioning them later. When you are cooling a room, it’s just the air: the furniture, walls, everything has become a heat sink in 30 degree weather.
So you are better off keeping the room somewhat cool before you use it and go full cool.
In my experience you can keep the rooms somewhat cool just but closing the curtains. If they are shaded they don’t collect that much heat. The AC only has to run for couple minutes for them to be nicely cool. If the room gets really hot (I once ranted an attic that was like an oven during the summer) it’s hard to keep it a bit cool. Either the AC is running constantly or it gets really hot.