Longford moved up to second place in Allianz league division having leaders Carlow their first defeat of the campaign.
The hosts started well on their way to a third league victory of the year.
Dylan Farrell, Matthew Carey and Oran Kenny all landing early scores as Longford played with the wind.
Carlow, chasing a fifth straight win, edged into a 0-5 to 0-4 lead after 20 minutes in a closely fought opening period.
However, Longford responded in style. Oran Kenny struck twice from two-point range, while Matthew Carey also raised an orange flag as the hosts began to take control.
Carlow stayed in touch thanks to a 32nd-minute goal from Chris Blake. The visitors trailed by just a point at the break as Longford led 0-11 to 1-7.
The visitors briefly nosed ahead in the second half when Conor Doyle split the posts from two-point territory.
Longford answered immediately, with Patrick Moran and Matthew Flynn restoring their advantage.
Mikey Bambrick levelled matters with a superb long-range effort for Carlow, setting up a tense finale.
But it was the Midlanders who finished with authority.
James Moran struck for a decisive late goal, and further scores from Dylan Farrell and Patrick Moran wrapped up a 1-2 closing burst that keeps Longford firmly in the promotion hunt with two rounds remaining.
Longford winning out 1-19 to 1-14.
