Heat Pump Not Reaching Set Temperature
Rooms not getting up to the temperature set on the thermostat, even after the heat pump runs for a long time.
What Is Causing This?
- 1Heat pump undersized for the property's heat loss
- 2Poor insulation meaning heat escapes faster than it is produced
- 3Radiators or underfloor heating undersized for the lower flow temperatures
How Urgent Is This?
This should be fixed in the coming weeks. Leaving it may allow the problem to worsen and cost more to repair.
What Needs to Be Done
A heat pump engineer will assess the system sizing, check insulation levels, and review emitter sizing. They may adjust flow temperatures, add radiators, or recommend insulation improvements.
How Much Will It Cost?
National average estimate
Labour: £2,033 – £5,083 | Materials: £4,000 – £10,017
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Ask a QuestionHow to Prevent This
Ensure adequate insulation before installing a heat pump. Size radiators for the lower flow temperatures. Have a proper heat loss calculation done during design.
Related Problems
The heat pump is running but not producing enough heat to warm the house or hot water.
Rooms feeling cold even when the central heating is running at full, with high energy bills.
The heat pump never seems to switch off, running 24 hours a day and driving up electricity bills.
Other Heat Pump Installer Problems
The heat pump is running but not producing enough heat to warm the house or hot water.
The heat pump outdoor unit producing excessive vibration, buzzing, rattling, or humming.
Heavy ice or frost forming on the outdoor heat pump unit, particularly on the coils, that does not defrost.
The heat pump controller or display showing an error or fault code, and the system stopping or reducing output.