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.


Police issue quicksand warning after riverbank danger for school pupils in Lancaster
Lancaster animal shelter launches 'Big Build' fundraiser to help save charity
LISTEN: Morecambe "definitely submitting a bid" to become first UK Town of Culture
Heysham Port upgrade blamed for traffic chaos 'trapping residents in their homes'
LISTEN: Tourism champs hail Eden Project and Tour de France as huge for Morecambe Bay area
Donation helps college pan ability football team to play in national championships
LISTEN: Meet the new manager of the Midland Hotel in Morecambe
LISTEN: Main contractor to build Eden Project Morecambe to be announced this month
£1.2m of funding for flood defence schemes in Lancaster district announced
Morecambe Bay hospital trust unveils new painless blood test
Thousands raised to help boost return of Lancaster Music Festival
High street computer games shop in Lancaster closes down
LISTEN: Carnforth actor wins Hollywood and Paris awards for horror film role
"1600 potholes repaired last week" says councillor as roads debate rumbles on
Burger King takeaway in Lancaster city centre closes down
Morecambe lifeboat crew reunite dog lost on sands with owner
New Morrisons Daily supermarket opens in Morecambe
Council investigate after derelict food trailer found dumped in Lancaster layby
Man charged after pedestrian died in Morecambe hit and run
LISTEN: We go out on Pothole Patrol in Morecambe

