Understanding Your Heat Pump’s Backup Settings
In the Irish climate, we rarely see the extreme temperatures that push a heat pump to its absolute limits, but it is good to know how the system reacts when the mercury drops. Most modern air-to-water heat pumps are designed to operate efficiently even in chilly conditions. However, when the outdoor temperature falls below a certain threshold, typically between -5°C and -10°C, the system may activate its emergency or auxiliary heat mode.
How Auxiliary Heat Works
The emergency heat setting usually triggers an internal electric immersion or a supplementary heater. This kicks in to give the system a boost when the outdoor air is simply too cold to provide enough thermal energy for your home’s needs. While this ensures you stay warm during a rare “Beast from the East” style weather event, it is important to remember that auxiliary heat is much more expensive to run than the standard heat pump cycle. It is designed as a safety net rather than a primary heating method.
Optimizing Performance During Cold Snaps
Every model is slightly different, so the exact switch-over point can vary depending on whether you have a Daikin, Mitsubishi, or Grant system. To keep your system running in its primary, energy-efficient mode for as long as possible, ensure that the outdoor unit is clear of any snow or ice buildup. Regular annual maintenance also ensures that the sensors responsible for triggering these modes are calibrated correctly. This ensures your backup heat only comes on when it is absolutely necessary, protecting both your comfort and your wallet.