What is air conditioning worth to a UK home?

After temperatures reached 38.1°C at Kew during the recent heatwave, cooling resilience feels increasingly relevant to residential valuation. Yet only 4.3% of homes in England currently use air conditioning.

The effect is unlikely to be a simple national premium.

A fixed system in a south-facing, top-floor flat may carry far more value than the same system in a shaded house with good ventilation. Floor level, glazing, orientation, building fabric, local temperatures, running costs and the number of rooms cooled all matter.

To measure that sensitivity properly, we could compare closely matched transactions and test whether air-conditioned homes achieve higher prices, shorter marketing periods or smaller asking-price discounts. We could then examine whether that effect becomes stronger following heatwaves or in properties with greater overheating exposure.

Solar PV adds another dimension. UK research has previously identified a 0.9–2% premium for homes with solar panels, but panels are not a binary feature either. Capacity, orientation, age, ownership, battery storage and export arrangements all affect their value.

The interaction may be more interesting than either feature alone: cooling demand tends to rise when solar generation is strongest. A home capable of producing some of the energy needed to cool itself may be valued differently from one exposed to the same heat but entirely dependent on the grid.

Residential valuation may therefore need to consider two sides of energy performance: how efficiently a home retains heat in winter, and how comfortably and affordably it sheds heat in summer.

The eventual “air-conditioning premium” may not be one number. It may be a highly local, property-specific sensitivity that changes as the climate and buyer expectations change.

Trying to assess the true value of AC and PV systems is a difficult issue. It's one of the ones we are looking to solve.