Lancaster Library has closed to the public so work can take place on the building's heating in the cold weather.
Planned works are taking place on a new heating system at the library in Market Square.
Contractors had originally been working at night so the library could remain open.
Temporary heaters were in place at the library, but they have stopped being effective in the current cold weather in keeping the building to an acceptable temperature.
So Lancashire County Council, who run the library, decided to close the building on Monday for a short period so the work could be completed.
Tests will be carried out today (December 14) on the new system and it is hoped the library won't be closed for much longer.
A Lancashire County Council spokesman said: "Lancaster Library is currently closed due to essential building works related to the building's heating system.
"Your nearest library is Morecambe, which will have extended opening hours and will be open from 9am on Tuesday and until 5pm on Wednesday this week.
"We are sorry for any inconvenience this may cause."
Lancaster Library has been designated as a 'Lancashire warm space' during the current cold weather.


PHOTOS: Eden Project Morecambe garden wins award on star-studded day at Chelsea Flower Show
Over 50s ‘youth club’ in Morecambe reduces hours due to ‘lack of footfall’
Under threat Lancaster day centre will remain open
'Look for a Book' event returns to Lancaster and Morecambe
Operation Sceptre tackles knife crime across Lancaster district
Eden Project Morecambe will become a ‘theatre of science like nowhere else on earth’
‘True local’ begins his year as mayor of Lancaster
Lancaster University research shows care home falls cut by a third with use of smart lights
Angela Rippon and ‘Eric and Little Ern’ launch Bring Me Sunshine Garden at Chelsea Flower Show
Talk and trail celebrating life of city’s groundbreaking inventor will mark Lancaster Day
‘Knight Ride’ fundraiser underway for free summer outdoor Lancaster music festival
Hundreds of kids pay homage to Eric Morecambe with special centenary celebration fun run
Lancaster paedophile given lengthy jail term for historic sexual abuse of young girl
LISTEN and PHOTOS: Town celebrates Eric Morecambe's 100th birthday in style
D-Day hero to open new Lancaster Armed Forces veterans centre on 102nd birthday
Pothole Patrol sisters from Morecambe take their campaign to breakfast TV
Morecambe beaches given national Seaside Award for cleanliness
Lancaster Oxfam charity shop set to reopen after closure
LISTEN and PHOTOS: Pupils at Eric Morecambe's school say Happy 100th Birthday in style
Mounted Police make arrests in Lancaster day of action

