Can a heat pump handle Slovakia’s harsh winters? Our tests at -23 °C speak for themselves.

When choosing a heat pump, Slovak homeowners most often ask one crucial question: “What happens when the temperature drops well below freezing? Will our home stay warm?” It’s a natural concern. Many older technologies struggled with efficiency during extreme cold and had to rely on expensive electric backup heating.

At EnergySky, we decided not to leave anything to chance. Even before the full-scale launch on the Slovak market, we put our devices through a “baptism by fire”—or rather, a baptism by freezing temperatures.

Real-world testing: When benchmarks aren’t enough

Although manufacturers’ laboratory tests provide precise specifications, Slovak winters can be unpredictable. We therefore closely monitored our test installation throughout the past winter season. The result? Even on nights when thermometers in our region read -23 °C, the system operated stably and without interruption.

Why do our pumps handle such conditions with ease?

1. The Power of the Natural Refrigerant R290

The key to success is the switch to the eco-friendly refrigerant R290 (propane). Unlike conventional synthetic refrigerants, R290 allows the pump to operate at much higher pressures and temperatures. This means that even when the outside temperature is well below freezing, the pump can produce water at temperatures up to 75 °C. In practice, this means thermal comfort without the need to switch to all-electric heating.

2. Smart defrosting without compromising comfort

A common problem during cold weather is frost buildup on the outdoor unit. Our system uses advanced defrosting logic that takes only as little time as necessary and minimizes energy loss. Thanks to the vertical design of the evaporator and the top air outlet, ice does not accumulate in critical areas, ensuring smooth, vibration-free operation.

3. The quiet you’ll especially appreciate in winter

At night, when the air is frosty and quiet, the noise from the unit carries much more clearly. During our tests at -23 °C, we were surprised not only by its efficiency but also by its acoustic performance. Thanks to a specially insulated compressor and smooth fan speed control, the EnergySky pump remains a quiet companion that won’t disturb you or your neighbors.

Ready for the season

Today, we can say with confidence: We’re ready. Our testing phase went exceptionally well, and the first units have already been shipped to their new owners. Our service technicians are fully trained and ready to provide professional installation so that you, too, can sleep warm and soundly this coming winter.

Don’t let the cold catch you off guard. Choose a solution that has been tested under the harshest conditions in Slovakia.