The first winter with a heat pump is where confidence is either built or lost, usually over things that are entirely normal and were never explained.
Home Comfort Assured Renewables installs and looks after heat pumps around Northwood. This is what to expect, what to ignore, and the short list worth picking up the phone about.
Normal things that alarm people
The outdoor unit will run for long periods rather than cycling on and off, and that is the point. Radiators will feel warm rather than hot, which is correct at a lower flow temperature and does not mean the system is underperforming. In cold, damp weather the unit will periodically defrost, briefly steaming and sounding different, then return to normal.
None of those is a fault. They are simply what a system designed around steady low temperature operation looks like from the kitchen window, and they read as wrong only against the memory of a gas boiler.
- Long running periods rather than short bursts.
- Radiators warm to the touch, not hot.
- Periodic defrost cycles in cold, damp weather.
Give the house time to settle
A heat pump responds slowly by design, so the first few weeks are about finding a steady setting rather than chasing comfort hour by hour. Change one thing, wait several days, and judge it then. Households that adjust daily never let the system settle and conclude it cannot hold temperature.
It is also normal for the house to feel different rather than worse. Even, continuous warmth is a different sensation from a house that was hot at seven and cooling by nine, and it takes a few weeks to stop reading it as insufficient.
What is worth reporting
Report anything that is a change rather than a characteristic: a new noise, ice building up and not clearing after a defrost cycle, water pooling or freezing where it did not before, pressure dropping, rooms that were fine in November and are not in January, or the system repeatedly stopping.
Home Comfort Assured Renewables carries out heat pump repairs and fault finding as a distinct service, and the first winter is exactly when a genuine commissioning issue shows itself. Reporting early is what keeps it a small adjustment rather than a season of discomfort.
- New noises, or ice that does not clear after defrost.
- Falling pressure or repeated shutdowns.
- Rooms that have got worse rather than always been cool.
The end of the first winter
When the weather turns, write down how it actually went: which rooms were comfortable, which were not, what the running cost looked like, and any behaviour you were unsure about. That note is the agenda for the first annual service and it is worth far more than trying to remember in September.
The first service is also when the commissioning settings get reviewed against a real winter's evidence rather than a survey's predictions, which is usually where the last of the running cost is found.
Related pages
- Heat pump servicing and performance checks
- Heat pump repairs and fault finding
- Air source heat pump installation
- Report something
Questions customers ask
Why do my radiators only feel warm, not hot?
Because a heat pump runs at a lower flow temperature by design. Warm radiators over longer periods deliver the same heat as hotter radiators in short bursts, and it is where the efficiency comes from.
Is it normal for the outdoor unit to steam and sound different sometimes?
Yes. In cold, damp weather the unit periodically defrosts, which briefly changes the sound and can produce visible vapour. It should clear and return to normal running afterwards.
How long should I leave a setting before judging it?
Several days. Heat pumps respond slowly, so daily adjustment tells you nothing and usually costs more. Change one thing, wait, and then decide.
Long runs, warm radiators and occasional defrosting are the system working. Changes, ice that will not clear and falling pressure are worth a call. Everything else improves with patience.
Home Comfort Assured Renewables looks after heat pumps around Northwood. The contact page reaches them.
