Stamp duty in England may be changed to encourage people to make their homes more energy efficient.
Energy minister Claire Perry said householders would face "carrots and sticks" to prompt them into saving on heating bills and carbon emissions.
The government will fail to meet its climate change laws unless it can cut emissions from household heating.
The proposals are part of the government's Clean Growth Plan which defines how it aims to reduce carbon emissions across the whole economy.
Ms Perry said she was "interested" in the idea of lowering stamp duty on properties that have been made energy efficient, and described the idea as potentially "one of the incentives" to encourage homeowners into implementing energy-saving measures on their houses.
The application of stamp duty is devolved around the UK, so this would only apply to energy efficient homes in England.
Ed Matthew, from the climate change think tank E3G, has welcomed the plan but says there needs to be a clear strategy.
Ms Perry said the plan would cover all parts of the economy, including cars and industrial emissions.
But energy campaigners fear the plan will not contain the measures necessary to meet the government's own laws on cutting carbon.