12000 BTU Mini Split Air Conditioner & Heater A++ Energy Efficient Inverter Split AC

The Costway 12000 BTU split air conditioner steps up the A++ inverter range to heat and cool larger spaces up to 70m² — an open-plan living area, large bedroom or small office — while staying as quiet as its smaller sibling. With a SEER of 6.2 and SCOP of 5.1, the inverter compressor varies its output to hold temperature without the constant cycling of a fixed-speed unit, and the silence function still drops noise to a bedroom-friendly 19dB. Cooling and heating are rated at 12,000 BTU (3400W / 3500W), with 21.6L/day dehumidification and 600m³/h airflow. Its cooling power input is a notably efficient 1500W, so at full output you'd spend roughly 39p an hour at around 26p/kWh, typically much less once the room is settled. Versus the 9000 BTU model, the extra capacity suits the larger 70m² rating rather than meaning higher everyday cost. You get 7 modes (cool, heat, dry, fan, auto, sleep, ECO), 4D swing, 5 fan speeds, child lock, self-clean and auto defrost, plus a 24-hour timer and 8m remote. It uses R32 refrigerant. As a split system it requires F-Gas-certified installation in the UK — this is not a plug-in portable.