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Heat pump service — intervals, filters, and winter operation
Updated 1 June 2026
The heat pump is often the home’s largest energy system — and the costliest when it fails mid-winter. Regular service means lower bills, longer life, and fewer emergencies. Here we cover basics, how often to service, what you can maintain yourself, and what to document for warranty and resale. Whether you have air-to-water, ground source, or air-to-air, the same principle applies: little upkeep often beats big repairs rarely. This guide focuses on what you as a homeowner can actually do — and when to call the installer.
How upkeep works — whatever the type
Air-to-water, ground source, and air-to-air differ, but some rules apply to all: the outdoor unit needs clear airflow, indoor units need clean filters, and you should follow the manual. Unusual noise, display warnings, or suddenly weaker heat are reasons to act early — not after the house has cooled. Note model and installation year. Warranty may require annual service by an authorised installer. Keep installation reports — they are the starting point when a new technician troubleshoots ten years later. If you have both heat pump and electric backup, test that backup works. Many discover only in cold weather that safety functions or controls do not behave as expected.
Service intervals — what usually applies
Many installers recommend a check once a year, ideally before heating season. Pressure is measured, filters changed or cleaned, drains checked, and software updated if needed. Ground source may have longer intervals between major service — follow contracts and warranty terms. Set a reminder in calendar or a maintenance app when you know roughly when the last visit was. «Doing it when it feels right» usually means waiting until breakdown. Book early — peak season for heat pump technicians is when everyone else discovers problems too. Ask the installer what service includes and what costs extra. Then you avoid invoice surprises and know what you can do yourself between visits.
Filters and simple care between service visits
Indoor units with filters often need more frequent care than the annual service visit. Clean or replace filters per manual — often every two to six months, more often with pets or dusty environments. A blocked filter means weaker heat and higher consumption. Keep the outdoor unit clear of leaves, snow, and ice. Gently remove dirt from fins and ensure meltwater can drain. Do not work on refrigerant or electrics unless trained — that is where DIY stops and professionals start.
Heat pump in winter — what often goes wrong
In winter, outdoor drains freeze, snow covers air intakes, and ice blocks the fan. Clear regularly per manufacturer advice — not with sharp tools that damage fins. Frequent defrost cycles can be normal at low outdoor temperature, but constantly poor heat may mean low pressure or dirt. Keep installer contact if you see repeated error codes. Document codes and dates — it saves troubleshooting time. Tie this to your house winter checklist so service and snow clearing are not forgotten the same year.
Documentation that protects warranty
Keep receipts, service reports, warranty certificates, and error codes. Warranty claims almost always require proof service followed the terms. At resale, buyers want to know the system was installed and maintained correctly — not just «it works today». Upload PDFs and photos in your maintenance app linked to the heating system. Then you find everything when needed, and the next owner gets a clear history.
Checklist: heat pump and service
Book annual service per manufacturer and installer.
Clean or replace indoor filters on schedule.
Check outdoor unit — clear airflow, no ice block, drain works.
Note unusual noise, warnings, and falling heat output.
Save receipts, reports, and error codes in one place.
Plan outdoor winter care alongside the house winter prep.
Check if warranty requires documented service — and meet it.
Set a reminder for next service before closing the season.
Keep maintenance in one web app
Connect these guides to your home — plan, reminders, and documents in one place.
Maintenance plan for your whole home
Reminders when service and tasks are due
Receipts, manuals, and warranties in one place
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