It seems we have been getting more spiders since we have changed to the four month schedule. I don't know how effective it is. I have seen two brown/dark brown spiders inside our home recently - one before our last visit. Also, I have seen spider outside. I know you have changed the time when you come as I assume it has to be more effective for you financially and personnel wise, but I don't know if it is best for my home. I remember when I first started with your company I was told you didn't think it was wise to go more than every 3 months and now you are doing every 4 months.