AC with Heating — Winter Energy Savings
Most people associate air conditioning exclusively with summer cooling, yet modern split systems are fully capable heat pumps that can warm your home efficiently throughout the winter months. A heat pump does not generate heat by burning fuel or passing current through a resistive element — instead, it extracts thermal energy from the outdoor air and transfers it inside. This fundamental difference in operating principle is what makes heat pump heating dramatically more efficient than any conventional electric heater.
The key metric for understanding heat pump efficiency is the Coefficient of Performance, or COP. A COP of 4.0 means that for every 1 kW of electricity consumed, the unit delivers 4 kW of heat into the room. Compare this to a traditional electric radiator, which has a COP of exactly 1.0 — it converts electricity into heat on a one-to-one basis. In practical terms, heating with a heat pump at a COP of 4 costs roughly one quarter of what electric heating costs, translating to savings of up to 70 percent on your winter heating bill.
A common concern is whether air-source heat pumps can cope with Polish winters. Standard residential units operate reliably down to around minus 15 degrees Celsius, which covers the vast majority of Warsaw winter days. Premium cold-climate models such as the Mitsubishi Zubadan series and Daikin Altherma are engineered to maintain high heating output at temperatures as low as minus 25 degrees Celsius. These units use enhanced vapour injection compressor technology to sustain performance even in the most severe cold snaps.
The cost comparison with gas central heating is also favourable in many scenarios. With current gas and electricity prices in Poland, heat pump heating costs are broadly comparable to gas boiler heating — and in well-insulated apartments with moderate heating needs, the heat pump often comes out cheaper. The advantage becomes even more compelling when you consider that a single AC unit provides both cooling in summer and heating in winter, eliminating the need for a separate heating appliance and reducing your overall equipment investment.
Whether a heat pump AC can fully replace your existing radiators or should serve as a supplementary heat source depends on several factors. In a well-insulated modern apartment of up to 60–70 square metres, a properly sized split unit can comfortably serve as the primary heating source for the main living areas. In older buildings with poorer insulation or larger floor plans, the AC is best used alongside existing radiators — taking over the bulk of the heating load while the radiators handle peak demand during the coldest days.
Real-world energy savings depend on your specific situation, but the numbers are consistently impressive. A Warsaw apartment owner heating a 50 m² living room and bedroom with two 3.5 kW inverter split units can expect monthly electricity costs for heating of approximately 200–350 PLN during the coldest months, compared to 700–1,000 PLN or more with electric radiators. Over a typical heating season from October to April, the cumulative savings can easily exceed 3,000 PLN — enough to recoup a significant portion of the installation cost within two to three years.
If you are considering using your air conditioning for winter heating — or installing a new system with heating as a primary goal — professional guidance is essential. The unit must be correctly sized for the heating load, not just the cooling load, and the outdoor unit placement must account for defrost drainage and airflow in freezing conditions. At LeoKlima, we specialise in heat pump installations for year-round comfort. Contact us for a free survey and a detailed heating cost estimate for your home.
