Up to 200,000 homes have yet to switch over to digital TV, even though their analogue service will be turned off in just a few months time.
The Department of Communications is urging people who do not already have digital TV to find out about the new Saorview service, which comes into effect on October 24.
Only around 15% of those effected have so far made the switch.
Communications Minister Pat Rabbitte has said the Government wants to make sure no one is left behind.
Mr Rabbitte said: "The switching off of the analogue TV network is now just four months away, we are now commencing the final phase of our promotional campaign by delivering an information booklet to every home in the country.
"Digital TV is available now in the form of Saorview or various pay TV services, so we are keen to encourage people not to wait until the last minute to make the switch."