Question 1

How efficient are air source heat pumps in cold Scottish winters?

Accepted Answer

Modern heat pumps maintain a Coefficient of Performance (COP) of 2.5–3.5 even during Scotland's coldest months. Scotland's average winter temperature of 3–5°C is well within optimal range — the technology is proven in Norway and Finland where winters are far colder.

Question 2

Do air source heat pumps work in Scottish winter conditions?

Accepted Answer

Yes. All modern air source heat pumps are rated to operate down to at least -20°C, with many models working to -25°C or lower. Scotland rarely experiences temperatures below -10°C, so winter performance is consistently reliable across the country.

Question 3

Why do heat pumps need to run at lower temperatures than gas boilers?

Accepted Answer

Heat pumps are most efficient when the temperature difference between the heat source and the output is small. Lower flow temperatures of 35–55°C allow the refrigerant cycle to operate at a higher COP, delivering more heat per unit of electricity than operation at 70–80°C.

Question 4

How much electricity does a heat pump use to heat a Scottish home?

Accepted Answer

A typical 3–4 bed Scottish home requires around 6,000–9,000 kWh of heat per year. With a COP of 3.0, this requires approximately 2,000–3,000 kWh of electricity. Actual costs depend on your tariff. Confirmed on your written quotation after the survey.

How Air Source Heat Pumps Work in Scotland