 Get ready for the inevitable power losses this summer and beyond with the new sleek and powerful Delta Pro 3 from EcoFlow. Learn more at EcoFlow.com. That's E-C-O-F-L-O-W.com. Brian in Arkansas is on the line and has a mysterious odor in the house. What's going on? I've got a crawl space under my house of about 1,900 square feet. And we've noticed the last several years, only in the summer, when we go away from a long weekend, we come back on a Sunday night and there's a peculiar odor in the house.