Air conditioner or heat pump: What's the difference?

How do an air conditioner and a heat pump work?

First, the most important point: an air conditioner and a heat pump operate on the same basic principle. A heat pump extracts heat from a natural source, such as the outside air or the ground, and transfers that heat indoors. In the summer, this process can be reversed so that heat is removed from your home and discharged outside.

The same thing happens with an air conditioner. A modern air conditioner can not only cool but also heat. In that case, technically speaking, we refer to it as an air-to-air heat pump. So the real difference lies mainly in the type of heat pump and the way the heat is distributed throughout your home.

What is a heat pump?

A heat pump uses energy from the environment to heat your home. Depending on the type, the system extracts heat from the outside air, the ground, or groundwater. There are various types of heat pumps for homes. The best type for you depends on your home, its insulation, available space, and desired comfort level.

So, is an air conditioner a heat pump?

When an air conditioner can also provide heat, it is technically an air-to-air heat pump. A traditional air conditioner extracts heat from the indoor air and discharges it outside, thereby cooling your home.

With the heating function, the system reverses this process. The outdoor unit extracts heat from the outside air, and the indoor unit releases that heat into your home. This makes it an attractive option for anyone who wants to use a single system for both heating and cooling.

• In the summer, to vent the heat from your home
• In the winter, to bring the warmth from the outside air indoors

What is the difference between the various types of heat pumps?

This is the main difference. With anair-to-air heat pump, heat is transferred directly into the room via the air. This is done using indoor units that blow warm or cool air into the room. This is the same principle as that used in a heating air conditioner.

Anair-to-water heat pumpworks differently. It uses heat from the outside air to heat water. That hot water can then be sent to your radiant floor heating, radiators, or other heating systems.

* The way an air-to-water heat pump cools depends on the distribution system. Cooling is generally less direct than with an air conditioner.

Can you also use a heat pump to cool a room?

Yes, but the type of heat pump determines how that happens. An air conditioner that can heat can also actively cool. The process is simply reversed: heat is extracted from the home and discharged outside.

An air-to-water heat pump can also provide cooling. This is achieved, for example, through suitable underfloor heating or other heat-dissipation systems designed for cooling. The sensation of cooling is different from that of an air conditioner. An air conditioner blows cooled air directly into the room and can therefore create a rapid and noticeable change in temperature. With underfloor cooling, heat is removed from the room more gradually.

Which heat pump is right for your home?

There isn't really a one-size-fits-all answer to this question. The best solution depends on what you want to achieve. The right heat pump depends on your home, your heating needs, and whether you also want to cool your home.

Air-to-air heat pump or air conditioning
An air-to-air heat pump heats and cools your home. The system transfers heat or cool air directly to the air in the room, so you’ll notice results quickly. This is a good option if you want to heat and cool specific rooms or are looking for a simple solution without a complex heating system.

Air-to-Water Heat Pump An air-to-water heat pump heats your home via radiant floor heating, radiators, or suitable convectors and can also provide domestic hot water. This solution is particularly suitable for well-insulated homes that can be heated at low temperatures.

What about the premiums in 2026?

The Flemish subsidy requirements also distinguish between different types of heat pumps. As of March 1, 2026, the requirements for active cooling in air-to-air heat pumps have been revised. An air-to-air heat pump with an active cooling function is now only eligible for the Mijn VerbouwPremie under certain conditions . Among other requirements, the system must be the sole central heating source in the home, and the home must be completely fossil-fuel-free.

The current subsidy amounts and eligibility requirements depend, among other things, on the type of heat pump and your income bracket. Therefore, always check the current eligibility requirements before planning an investment, or check out our blog post “What subsidies are available for renewable energy in 2026?”

Air Conditioner or Heat Pump: Conclusion

Air conditioning and heat pumps are therefore not entirely different technologies. An air conditioner that can also heat is, technically speaking, an air-to-air heat pump. The main difference from, for example, an air-to-water heat pump lies in the way heat is transferred.

The best solution for you depends on your home, your comfort preferences, and your energy consumption. Request a no-obligation quote and find out which heat pump or air conditioner is best suited to your situation.