A heat pump is one of the hardest-working appliances in a Canterbury building — heating through winter, cooling through nor'westers, and quietly filtering the air the whole time. A little regular care keeps it efficient, extends its life and heads off the mid-winter breakdown nobody wants. Here is what to do yourself, and when to call in a professional.
What you can do: filters every month in heavy use
The indoor unit's filters trap dust, pollen and pet hair. When they clog, airflow drops, the system works harder, running costs climb and the air can start to smell musty. The fix takes five minutes: slide the filters out, vacuum off the dust or rinse them in lukewarm water, let them dry fully, and slide them back. In winter and high summer, monthly is about right; in the shoulder seasons, every couple of months does it. If anyone in the building has allergies or asthma, keep to the monthly rhythm.
Keep both units clear and clean
Wipe down the indoor unit's casing and louvres so dust does not bake on, and check that curtains, furniture and shelving are not blocking airflow across the room. Outside, keep at least half a metre clear around the outdoor unit: trim back shrubs, move bins and firewood stacks, and sweep away leaves and grass clippings that collect against the coil. A quick hose-down of a dusty outdoor coil in summer helps heat dump efficiently — just switch the power off first and keep water away from electrical covers.
When to book a professional service
Once a year is the standard advice, and autumn is the ideal time — the system gets checked over before winter asks the most of it. A professional service goes well beyond filters: coil cleaning, condensate drain check, refrigerant pressures, electrical connections, fan and compressor health, and thermostat calibration. Book sooner if you notice weak airflow, odd smells, water dripping indoors, ice building up heavily, new rattles or buzzes, or power bills climbing without a change in use.
Preventative maintenance for workplaces
For offices, retail and hospitality spaces, where a failed unit means unhappy staff or customers, a scheduled maintenance plan beats reactive callouts. Regular visits keep every unit in a multi-system setup running evenly, catch small faults like blocked drains before they stain ceilings, and provide a paper trail for warranties and insurance. If your building runs several indoor units off busy schedules, talk to us about a routine that fits around your opening hours.
Southern Comfort Air Conditioning Limited services commercial and domestic systems across Christchurch, including preventative maintenance. Email admin@southerncomfort.net.nz to arrange a service visit.