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A wildfire researcher walks in front of an accessory dwelling unit burning during an experiment at the Institute for Business & Home Safety center on Thursday, April 16, 2026, in Richburg, S.C. (AP Photo/Erik Verduzco)

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Lead carpenter David Trull ignites wood cribs for an accessory dwelling unit burn experiment at the Institute for Business & Home Safety center Wednesday, April 1, 2026, in Richburg, S.C. (AP Photo/Erik Verduzco)

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The interior of an accessory dwelling unit sits at the Institute for Business & Home Safety center on Wednesday, April 1, 2026, in Richburg, S.C. (AP Photo/Erik Verduzco)

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An accessory dwelling unit burns during an experiment at the Institute for Business & Home Safety center on Thursday, April 16, 2026, in Richburg, S.C. (AP Photo/Erik Verduzco)

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Wildfire researchers and firefighters watch as an accessory dwelling unit burns during an experiment at the Institute for Business & Home Safety center on Thursday, April 16, 2026, in Richburg, S.C. (AP Photo/Erik Verduzco)

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Wildfire researchers watch an accessory dwelling unit burn during an experiment at the Institute for Business & Home Safety center on Thursday, April 16, 2026, in Richburg, S.C. (AP Photo/Erik Verduzco)

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Wildfire researchers watch an accessory dwelling unit burn during an experiment at the Institute for Business & Home Safety center on Thursday, April 16, 2026, in Richburg, S.C. (AP Photo/Erik Verduzco)

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A person walks near fans used for wildfire research at the Institute for Business & Home Safety center on Thursday, April 16, 2026, in Richburg, S.C. (AP Photo/Erik Verduzco)

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Chester County Firefighters Elizabeth Stevenson, from left, Michael Mackey and Charles Lee, watch an accessory dwelling unit burn during an experiment at the Institute for Business & Home Safety center Wednesday, April 1, 2026, in Richburg, S.C. (AP Photo/Erik Verduzco)