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Winter is coming — your air conditioner heats too. Cut heating bills by up to 67% vs electric heaters.

🇬🇧 Delivering air conditioning across the UK — free UK mainland delivery on in-stock units
Costway 12000 BTU Portable Air Conditioner with Heat
Costway

Costway 12000 BTU Portable Air Conditioner with Heat

Pre-OrderEnergy A
£462.690

Trade pricing available — apply or sign in for your trade rate

Dispatched in 2-3 working days
UK-Wide Delivery
Free UK mainland delivery on in-stock units
🇪🇺 EU Delivery available
EU pre-order — approx. 4 weeks, dispatch + 5–10 working days EU transit
Orders under €150 ship VAT-paid at checkout (IOSS, no charges on delivery). Orders of €150 or more ship DDU — import VAT and customs duty are collected by the courier on delivery.

Retail prices include VAT.

Experience ultimate year-round comfort with the Costway 12000 BTU Portable Air Conditioner with Heat. This premium unit is a true all-in-one climate solution, offering powerful cooling for summer and efficient heating for winter. Whether you need to lower the temperature during a heatwave or add warmth on a chilly evening, this unit delivers consistent performance. Its high 12000 BTU capacity makes it suitable for larger living areas, providing rapid results. The unit includes a remote control and an intuitive interface, allowing you to switch between modes, adjust fan speeds, and set timers with ease. Its portable design ensures you can move it wherever it is needed, while the included window kit makes installation simple and effective. With its dual-functionality, this Costway unit eliminates the need for separate heating and cooling appliances, saving you space and money. Invest in this versatile, high-capacity air conditioner to maintain the perfect indoor climate throughout every season, ensuring your home remains a sanctuary of comfort regardless of the weather outside.

1

Self-install friendly

This unit is designed for confident DIYers. Guides & video below.

Add smart control

No built-in Wi-Fi — automate this unit with a smart plug & temperature sensor.

  • Free UK mainland delivery on in-stock units
  • Manufacturer warranty included
  • 14-day returns

Full Specifications

Cooling Capacity12,000 BTU
Recommended Room Size35-40 sqm
Energy RatingA
Smart HomeNot built-in
Noise Level—
CategoryPortable AC
SKUCW-12000-PORT-HEAT

Description

Experience ultimate year-round comfort with the Costway 12000 BTU Portable Air Conditioner with Heat. This premium unit is a true all-in-one climate solution, offering powerful cooling for summer and efficient heating for winter. Whether you need to lower the temperature during a heatwave or add warmth on a chilly evening, this unit delivers consistent performance. Its high 12000 BTU capacity makes it suitable for larger living areas, providing rapid results. The unit includes a remote control and an intuitive interface, allowing you to switch between modes, adjust fan speeds, and set timers with ease. Its portable design ensures you can move it wherever it is needed, while the included window kit makes installation simple and effective. With its dual-functionality, this Costway unit eliminates the need for separate heating and cooling appliances, saving you space and money. Invest in this versatile, high-capacity air conditioner to maintain the perfect indoor climate throughout every season, ensuring your home remains a sanctuary of comfort regardless of the weather outside.

Compare similar units

Side-by-side specs for other portable ac in a similar BTU range.

Cooling Capacity
12,000 BTU
12,000 BTU
12,000 BTU
12,000 BTU
Room Size
35-40 sqm
Up to 25m²
Up to 35m²
Up to 35m²
Energy Rating
A
A
A
A
Heating Capable
Yes (heat pump)
Yes (heat pump)
Yes (heat pump)
No
Smart Home
Not built-in
Not built-in
Tuya/SmartLife
Amazon Alexa, Google Home
Stock
Pre-Order
In Stock
In Stock
In Stock
Price inc VAT
£462.69
£615.00
£600.00
£780.00

Annual energy savings estimate

How much this A-rated unit could save versus a standard C-rated model, based on your usage.

This unit

127 kWh/yr

EER 10

Standard model

158 kWh/yr

EER 8

Est. saving

£8.55

32 kWh/yr less

Estimate based on the unit's energy-rating efficiency factor and cooling capacity (12,000 BTU). Actual savings vary with room size, climate and usage patterns.

Winter heating cost: this AC vs electric heaters

This unit reverses to heat your room in winter. Based on its 4 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.

Electric heater / season

£712

This AC / season

£237

You save / season

£475

~67% less electricity

Heating methodElectricity / seasonCost / seasonEfficiencySummer cooling
This heat-pump AC879 kWh£237Up to 300%
Plug-in electric heater2638 kWh£712100%
Electric storage heater2638 kWh£712100%

Heat output estimated from this unit's 12,000 BTU/hr rating. A heat pump moves heat (COP ≈ 3), so it uses about a third of the electricity of a direct-electric heater for the same warmth. Actual savings vary with room size, insulation, tariff and usage. See the full comparison →

Share your savings

This heat-pump AC costs only £237/season to heat a room vs £712 for an electric heater - that's £475 saved. https://stockool.store/products/costway-12000-btu-portable-ac-heat

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