Looking After Your Air Source Heat Pump
Practical Tips for Keeping Your Heat Pump Working Efficiently All Year Round
Once your air source heat pump is installed, the good news is that it’s low maintenance. But like any heating system, simple care can help it run efficiently, save money, and last longer.
This page covers everyday advice for caring for your external air source heat pump, including the compact units fixed near windows or mounted outside.
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Quick Checklist: How to Keep Your Heat Pump Healthy
- Keep the area around the outdoor unit clear.
- Check for leaves, debris, or snow build-up weekly.
- Book a yearly service with a qualified engineer.
- Check vents and filters regularly for blockages.
- Avoid covering the unit or enclosing it too tightly.
- Keep the outdoor fan blades clean and clear of obstructions.
- Listen for unusual noises – they can indicate an issue.
- Don’t worry if it frosts up occasionally in cold weather – the unit will defrost on its own.
1. Keep the Outdoor Unit Clean & Clear
Most heat pumps are installed outside your home—free-standing on a base, mounted on a wall, or placed near a window.
- Make sure there’s at least 30cm of space around the unit
- Clear away leaves, twigs, or garden clutter that could block airflow.
- In winter, brush off snow or ice that might collect on or around the unit.
- Never cover the unit with a bag, tarp, or box – it needs to breathe.
Tip: Set a reminder once a week to give it a quick visual check — it only takes a minute!
2. Listen for Unusual Sounds
Your heat pump will make a gentle humming noise when running.
Things to look out for:
- Rattling, knocking or high-pitched sounds
- Loud vibration or buzzing that’s new.
- The unit stops and starts frequently.
Call us – it may need a quick check-up or part replacement before it becomes a bigger issue.
3. Book Your Annual Heat Pump Service
Just like a boiler, your heat pump needs a professional annual service to:
- Check the refrigerant pressure and system performance
- Clean the coils and the internal parts.
- Make sure it's running safely and efficiently
- Catching any early signs of wear and tear.
APE Heating offers affordable annual servicing for all types of heat pumps — whether we installed yours or not.
4. Don’t Worry About Frost Or Mist
During colder months, it’s normal for the outdoor unit to:
- Look frosty
- Give off mist
- Make a whooshing sound during a defrost cycle.
It’s all part of how the unit regulates itself.
5. Check the Filters & Vents
If your system has indoor units with fans (air-to-air), check and clean the air filters regularly, especially during high-use months. Dust and dirt build-up can block airflow and reduce efficiency.
Most filters can be:
- Removed easily
- Vacuumed or rinsed under cool water
- Left to dry before putting back in
Less regular filter cleaning is needed for hair-to-water systems, but vents and radiators should be dust-free.
6. Safety First
Heat pumps are very safe, but here’s how to keep them that way:
- Don’t tamper with internal components or wiring
- Never use a pressure washer to clean the outdoor unit.
- Make sure children and pets don’t play too close to the unit.
- Call a professional if something seems off.
Need More Info Before Filling This Out?
Check out our guides and articles to help you decide if a heat pump is right for your home:
