We moved into our brand new, 3200 sq. ft., 2-story house a year ago in March. When spring came and the weather warmed up we started noticing an odd odor in the bathrooms and not the "usual" bathroom odors. I first thought it was a gas leak and had the Gas Co. people come out who checked with their wands and meters and detected nothing. Then the Water Dept. was out to check for sewage gas and detected nothing. I thought my cat could have sprayed somewhere so I bought some special odor-neutralizing cleaner and thoroughly washed all areas a couple times with that without any improvements. I had a plumber out who couldn't smell it. And that's part of the problem--the odor is only present when the temperature is warmer. It diminishes in the evenings and is not noticeable when the weather is cold. And not everyone can smell it! I am especially sensitive to it and it gives me a headache. The smell is most prevalent in the upstairs bath but is also detected in the other two bathrooms. I don't know where to start to have this problem identified and remedied. Any suggestions would be great. Thanks.