Crews responded to the second fire on Victory Drive in New Haven within 12 hours on Tuesday morning.
Firefighters said Tuesday's fire happened around 4 a.m. at the house next door to 24 Victory Drive.
It is unclear how much damage the house sustained.
Less than 12 hours earlier, firefighters were called to another fire on Victory Drive.
Firefighters responded to 31 Victory Drive around 7:45 p.m. on Monday after getting reports of heavy fire.
There is no word on the condition of the home.
The causes of both fires are under investigation.
