Insights
Winter Heat Pump Checklist: Getting Your System Ready for the Cold
New Zealand winters put real demand on a heat pump, often running many hours a day for months at a time. A bit of preparation before the cold sets in makes a noticeable difference to both comfort and your power bill, and it is far easier to sort small issues in autumn than to discover a fault on the coldest night of the year.
Start with the filters. These sit behind the front cover of the indoor unit and catch dust, pet hair, and general household particles. A clogged filter forces the unit to work harder to push air through, which reduces heating output and increases running cost. Slide the filters out, vacuum off loose dust, then wash with lukewarm water if they are especially grubby, and let them dry completely before refitting. This takes about ten minutes and is worth doing every 4 to 8 weeks through winter, not just once at the season's start.
Next, check the outdoor unit. Over spring and summer it is common for leaves, grass clippings, spider webs, and general garden debris to build up around and inside the casing. Clear at least 30cm of open space around all sides so air can flow freely, and remove any plants or fencing that have crept closer than that over the year. Restricted airflow at the outdoor unit is one of the more common causes of reduced heating performance and unnecessary icing during frosty mornings.
Book a professional service if it has been close to or over a year since the last one. A technician will check refrigerant levels, clean the internal coil, inspect electrical connections, and confirm the unit is running at the efficiency it should be. This is also the point where small issues like a failing capacitor or a slow refrigerant leak get caught early, before they turn into a mid winter breakdown or a bigger repair bill.
Test the system properly before you actually need it, rather than waiting for the first genuinely cold night. Run it on heating mode for at least twenty minutes and check it reaches temperature at a reasonable pace, that there are no unusual noises, and that the remote and any timer functions still work as expected. If anything seems off, you have time to book a technician before demand for callouts peaks through the coldest weeks.
Some ice forming on the outdoor unit during very cold mornings is completely normal, the system runs an automatic defrost cycle to clear it. If you notice heavy icing that does not clear within an hour or so, or the unit seems to be running a defrost cycle unusually often, that is worth a professional look rather than waiting it out, since it can point to a refrigerant or sensor issue.
Finally, think about how you are actually using the system. Setting a consistent, moderate temperature and letting the heat pump maintain it is generally cheaper than switching the unit off and on and asking it to recover from a cold room each time. Closing curtains at dusk and keeping doors shut to rooms you are not heating both help the unit work less to keep the spaces you use comfortable. A little routine maintenance and sensible use go a long way toward a warm, efficient winter.