A fire destroys a house in Alterra. Photo by Michelle Chance

A house caught on fire in the 44900 block of West Buckhorn Trail in Alterra Monday afternoon. There are no reports of injuries.

Workers were load testing a new air conditioning unit being installed at the house when the fire broke out, according to Maricopa Police Department spokesman Ricardo Alvarado.

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The fire spread to the roof, where flames were visible. Up to four people were evacuated from the house. Firefighters with Maricopa Fire/Medical Department responded to the scene around 3:45 p.m. Units were also dispatched from Chandler, Sun Lakes and Casa Grande.

With increased winds, firefighters went into defensive mode to protect surrounding homes as the roof fell in.