When considering renewable heating options, many homeowners ask if air source heat pumps (ASHPs) can handle the UK’s chilly winters. It’s a valid question. This post explores how ASHPs perform in cold weather, debunking myths and explaining why they are suitable for most UK homes.

Myth: Heat Pumps Can’t Work in Cold Weather
The misconception comes from older technology and misunderstanding how heat pumps work. Modern ASHPs can extract heat from outside air even when temperatures fall below freezing.

How Heat Pumps Work in Cold Weather
ASHPs transfer heat from the outside air to your home using a refrigerant cycle. Even at 0°C or below, there’s still heat energy in the air to extract. Advanced compressors allow efficient operation down to -15°C or lower.

Efficiency and Coefficient of Performance (COP)
Efficiency is measured as COP, which compares energy used to heat delivered. Modern units have COPs of 3-4, meaning 1 kWh electricity produces 3-4 kWh heat.

Real-World Performance in the UK
Studies and installations across the UK show homes remain warm with ASHPs, even in northern regions. Systems are designed with proper sizing and insulation to maintain comfort.