The suspicious fires, which destroyed a property in Little Conadilly Street, and severely damaged another property on Herbert Street, are under investigation by police.

Officers have issued a fresh call out for public help to solve the investigations.

Forensics have examined both of the homes, and local police have taken statements from neighbours and witnesses.

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It's not yet known whether the two incidents are linked, but police said investigations are continuing.

Firefighters from Fire and Rescue NSW were called to the scene of the Herbert Street blaze at about 6pm on Sunday, before being called back out to the Little Conadilly Street home at 2am.

Crews used breathing apparatus to take control of the Herbert Street fire, but this wasn't needed at the second property as the house was "destroyed" by the fire.

Luckily, no one was home at either incident.

Anyone with information is urged to contact Gunnedah police on 6742 0999.