The project was launched in April last year and offers free loft and wall cavity insulation to both homeowners and private tenants.
It is now being rolled out across the city on an area by area basis, as well as being offered to all those aged 70 or over or those on qualifying benefits.
So far more than 3,150 homes have been insulated for free
and more than 7,000 households have signed up to the programme.
Sheffield Council's Cabinet member for housing and safer, sustainable communities, Bob McCann, said: "With the cold snap we've been experiencing it's more important than ever that local people can keep their homes warm, without seeing energy bills go through the roof. Therefore I'm delighted that there are over 3,000 warmer homes this winter."
In total, almost 29,000 properties in Sheffield have been contacted about the scheme.
"Those households that aren't eligible for additional insulation are also being offered information on issues such as money-saving and carbon reduction.
So far, 223 homes have been referred to a boiler replacement scheme and 72 households are to receive a Warm Front heating grant.
The first wards to be targeted by the scheme are Walkley, Manor Castle, Arbourthorne and Hillsborough. All private households in these areas are entitled to contact Sheffield Council to sign up to the scheme.
Those over 70, or in receipt of benefits, can sign up regardless of where in Sheffield they live.
Coun McCann added: "I would urge anyone in these areas or those who are eligible to get in contact to sign up to the free scheme.
"All you have to do is call 0800 915 9096 and we'll take care of the rest absolutely free. It really is that easy.
"With the rising cost of heating bills and the ongoing recession, many people are left with the difficult choice of heating or eating. In a modern society this simply isn't acceptable."