Almost half of all Scots have not checked their home's insulation levels this year, even though nearly four out of five people are worried about the cost of heating this winter.
A YouGov study found that 77% were concerned about the cost of their energy bills but 47% had not checked their home insulation levels for at least a year.
The same survey found 45% would be interested in installing loft insulation while 32% would consider wall insulation to help make their homes warmer.
But fewer than a third of people - 29% - said they had claimed the free insulation they are eligible for.
The Home Energy Scotland Hotline - 0800 512 012 - provides people with free advice on energy, with more than 230,000 people having benefited since April 2009.
More than 24,000 heating systems have been installed since then and last year 12,000 households received vouchers for new boilers.
Meanwhile, many more people will be eligible to have free insulation fitted in their home or for a £400 voucher to help them replace their boiler, while some people will qualify to have a new boiler or central heating system installed at no cost to them.
Deputy First Minister Nicola Sturgeon said: "Scotland is an energy-rich nation and everyone should live in a safe, warm, affordable home.
"The Home Energy Scotland Hotline is a vital source of information for families across Scotland, providing comprehensive advice on energy-saving to support those most in need.
"I would urge anyone who has not looked at loft or cavity wall insulation or those looking to replace their old and inefficient boiler to contact the Hotline as soon as possible to find out about the range of offers available to help them cut their household heating bills this winter."