Dallas Fire-Rescue spokesman Jason Evans says the four firefighters suffered heat-related issues in the pre-dawn blaze Monday. Evans says all were treated at the scene.
The National Weather Service says temperatures were in the low 80s at the time of the fire, reported around 3:30 a.m. Monday.
Investigators say electrical short in the attic caused the fire. Evans says the home suffered about $125,000 worth of damage.