I live in an 8-year-old 3 story home. We are on a private well and septic and have a sump pump in the basement. Every summer when the weather gets hot we start getting septic smells in the house. Have had our tank pumped yet we still get the smell. I’ve read that it could be a dry trap so I go and run water in every drain and appliance and it doesn’t stop the smell. We can’t pinpoint the origin of the smell. Once it comes it seems to cover the house instantly and doesn’t seem stronger in one area than another. We do have forced air which could be carrying the smell to the whole home but we still can’t figure out where the smell is originating. This problem only happens in the summer when the weather gets hot. We don’t have any smell problems in Fall, Winter, or Spring. All the local plumbers are always willing to come “take a look” but not for less than $100 and actual services performed are always more than $500. I’m willing to have a plumber fix the problem but I’m worried we are going to have to spend $3000+ to find the answer. Does anyone have any ideas or suggestions?