Houseplant Problem at Our Last House

I have always had an abundance of houseplants in every home we've lived in. I do mean an abundance too, with houseplants in pretty much every room. Houseplants are a wonderful natural way to soften a room, bring interest and life into a room and improve air quality. Our last hose was horrid for houseplants and yet I never did figure out what the problem was. I honestly believe the house was