When helping customers select chimney caps, repairmen could point out to them the advantages of choosing one which features a sealing damper.
Chimney Liner Pro claims that caps which have this addition can help people slash their energy costs, as it can help keep cold draughts from entering a property.
"A top sealing damper chimney cap has a cable that runs inside the flue to a lever that can open and close the damper from inside the house. With the damper closed, you will immediately notice fewer cold draughts," the blog says.
They can be particularly useful for people with old metal fireplaces, as these structures still let in cold air even when closed tightly.
The Ask The Chimney Sweep blog stated recently that stainless
steel chimney caps are the way forward, as they are not susceptible
to rust like many of the alternatives and will not need replacing
as often.