More than 1,800 homes have been assessed for the Government's flagship Green Deal scheme, figures show.
The Green Deal aims to cover the upfront costs of measures of energy saving technology such as insulation, with the money paid back by savings on fuel bills.
The Government said the 1,803 assessments carried out in little more than a month showed "genuine interest from consumers" in the scheme.
Energy and Climate Change Secretary Ed Davey said some householders with older homes or those on benefits or low incomes may qualify for extra financial help through the £1.3 billion a year Energy Company Obligation (ECO).
Some £26.9 million worth of contracts to install energy saving measures into homes have already been signed under the ECO requirement for power companies to support energy efficiency, the figures show.
Mr Davey said: "We have created the Green Deal to overhaul our inefficient housing stock and help people keep their homes warm while also reducing their energy bills. And as the market builds and awareness of the Green Deal increases, I am confident that consumer interest will grow and grow."
He also said the Green Deal would cut carbon and create skilled jobs, with the number of businesses getting on board increasing daily.
The figures show 40 firms are authorised as Green Deal providers, with a further 629 registered to carry out installations and 619 individuals registered to offer assessments.
Friends of the Earth energy campaigner Dave Timms said: "Making our homes energy efficient is a great way to slash fuel bills, have a warm place to live and cut UK carbon emissions."
But Mr Timms was not entirely positive about the scheme with fears of a triple –dip recession likely to slow uptake.
He added: "The Green Deal is heading for trouble without lower interest rates, more money to tackle fuel poverty and tough regulations on landlords renting out dangerously cold homes.
"1,803 homes have been assessed, not actually insulated; it's still early days, but the initial signs aren't good."