I been getting a strange smell after the AC is ran almost like a gaseous smell, we been redoing the hardwood floors and trying to keep well ventilated with windows open and AC on to keep humidity down. I check all the gas lines with my meter for leaks and none found, could this smell be freon? Or could it be the stale air from the stain and polyurethane building up and consensing and then putting off odor?

Could be crud growing in the condensation pan. Give it a good shot of chlorine bleach. I am not sure Freon has much smell.

I been getting a strange smell after the AC is ran almost like a gaseous smell, we been redoing the hardwood floors and trying to keep well ventilated with windows open and AC on to keep humidity down. I check all the gas lines with my meter for leaks and none found, could this smell be freon? Or could it be the stale air from the stain and polyurethane building up and consensing and then putting off odor?
... like mildew then Labman is correct to have you clean the condensation pan. Car A/C units often suffer from the same smell but never knew where to apply the bleach.