Energy suppliers have raised concerns over which party will have to pick up potential debts from the government's Green Deal loans.
Landlords who use energy comparison tools to find the best deal for their rental properties should work together with tenants to boost sustainability in the home, according to the British Property Federation (BPF).
The UK's cheap energy from renewable sources targets need to be more ambitious, the Centre for Alternative Technology has stated.
British householders are missing out on free cheap energy advice for their utility bills because they do not realise they are entitled to help.
Individuals living in Liverpool, north Wales and southern Scotland are typically paying around £75 more a year than for their cheap electricity and gas than those living in the south-east.
Customers will only be able to use cheap electricity derived from renewable sources on an "economically sustainable" scale when the government can withdraw heavy subsidies, the Renewable Energy Foundation has argued.