A recent study has shown the extent to which homes in the UK are lacking in energy-efficiency.
While older conservatories are often draughty and allow heat to escape, modern quality conservatories are designed to retain and even help attract heat.
However, the Halifax Estate Agents survey found that just one per cent of homes in England and Wales fall into the highest official energy efficiency rating band.
The data revealed that flats tend to be the most energy-efficient properties, with almost half (49 per cent) falling into category B or C.
Halifax Estate Agents chief economist Martin Ellis explained that there could be a surge in home improvements as people look to make their homes more energy-efficient.
"The overwhelming majority of homes have an average energy efficiency rating, with hardly any in the top two most efficient bands," he said.
"However, more sellers are likely to make improvements to their homes over time, leading to improved EPC [energy performance certificate] ratings in the future, as they become increasingly aware of the benefits of making their property more efficient."
The EPC ratings run from A to G, with A being the most energy efficient and G being the least.