With energy performance certificates (EPC) now being required as part of the home information packs when selling a home, homeowners would be expected to look to boost or safeguard their rating.
However, a recent study has found that only one in 100 homes in England and Wales fall into the A-band bracket of energy-efficiency.
Modern quality conservatories allow homeowners to enjoy views of their garden without the fear of haemorrhaging heat energy or causing the draughts so often associated with their antiquated cousins.
The Halifax Estate Agents survey found that flats are the most energy-efficient properties, with 49 per cent falling into category B or C.
"The overwhelming majority of homes have an average energy efficiency rating, with hardly any in the top two most efficient bands," said Halifax Estate Agents chief economist Martin Ellis.
"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."
Big Brother host Davina McCall recently bought a country mansion complete with two pools and a huge conservatory.