Common reasons for cold rooms in a house

House image by Gonçalo Carreira from

Draughty, cold rooms can be an expensive problem for homeowners in the winter. According to Energy Star, the coldest rooms in houses are typically over garages and basements, are in an addition to the house, or are in the attic.

There are several common reasons why a particular room is colder than the others and sometimes the solution requires only a simple fix.

Leaks and Blockages

Leaks are among the most common causes of cold or draughty rooms, according to Energy Star. Cold air can seep in through tiny openings around windows, light fixtures, outlets and doors. Leaks can even be found around recessed lighting. These openings not only allow cold air in, they allow warm air to leak out. Energy Star recommends finding and sealing any air leaks, which should help the room maintain the same temperature as the rest of the house. If the sealing projects are extensive, consider hiring a contractor.

If a room is consistently cold, the problem may be from a blockage. Heating system filters get heavy use during the winter and can become clogged, slowing the flow of warm air. Energy Star recommends checking your heating system's filter monthly and changing it at least once every three months.


Poor insulation can also lead to cold rooms, especially when the entire room--perhaps one in a new addition--has not been insulated properly. According to Energy Star, homeowners who have properly insulated and sealed their homes can save about 20 per cent on the costs of heating or cooling. To prevent heat from escaping a room, consider adding insulation to the walls. Also, make sure that ducts in the home's attic, basement and garage are properly insulated.

System Problems

Cold rooms that do not warm up after all areas have been sealed and insulated may have a more serious problem. If the whole house seems to have trouble maintaining a comfortable temperature, there may be a problem with the heating system. If some rooms are comfortable while others are cold, there may be a problem with the design of the duct work. In this case, Energy Star recommends hiring a contractor who specialises in energy efficiency and can evaluate your home.