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