Replacing previous 7.5kW split system, averaging less than 10kWh per day, hopelessly oversized, could Daikin 2.5kW do it, 7m square kitchen/dining/living room? Thermostat 18 for winter and 24 for summer, it consumes just 2.5kWh per day or 1279kWh in 644days. Not cheap gadget up front but obviously pays for itself, big time, very happy customer.