Modern Heating: Heat Pumps Explained Simply for Mainstream Homeowners
Why a small, quiet box outside your house can replace a boiler — and why it works best paired with a well-insulated home.
How a Heat Pump Actually Works
An Air Source Heat Pump (ASHP) doesn't burn fuel to create heat — it extracts heat that already exists in the outside air, even on a cold day, and concentrates it using a refrigeration cycle. For every unit of electricity it uses, it can deliver three or four units of heat, making it far more efficient than gas, oil, or direct electric heating.
How a Heat Pump Actually Works
An Air Source Heat Pump (ASHP) doesn't burn fuel to create heat — it extracts heat that already exists in the outside air, even on a cold day, and concentrates it using a refrigeration cycle. For every unit of electricity it uses, it can deliver three or four units of heat, making it far more efficient than gas, oil, or direct electric heating.
Why Size Matters More Than Power
A heat pump performs best at a low, steady output rather than short, powerful bursts — which is exactly what a well-insulated home needs. This is why heat pumps are most cost-effective paired with the fabric-first insulation strategy used across our New Build, Conversion, and Extension guides: a smaller, quieter, cheaper unit can comfortably heat a home that isn't constantly losing warmth.
Why Size Matters More Than Power
A heat pump performs best at a low, steady output rather than short, powerful bursts — which is exactly what a well-insulated home needs. This is why heat pumps are most cost-effective paired with the fabric-first insulation strategy used across our New Build, Conversion, and Extension guides: a smaller, quieter, cheaper unit can comfortably heat a home that isn't constantly losing warmth.
Living With a Heat Pump
Day to day, a heat pump runs more like a thermostat set-and-forget system than a boiler you switch on and off. It keeps the home at a stable, gentle temperature around the clock, working alongside underfloor heating or low-temperature radiators for even, consistent comfort.
Living With a Heat Pump
Day to day, a heat pump runs more like a thermostat set-and-forget system than a boiler you switch on and off. It keeps the home at a stable, gentle temperature around the clock, working alongside underfloor heating or low-temperature radiators for even, consistent comfort.