You do have to be carefull. Your house lasted a hundred years because it could breath. Once you tighten it up you need fans that suck warm air out and need fresh air in, then you change out the windows that will have to be replaced every so many years. Just spilling a bucket of water or having a small overflow can be a desaster instead of an inconvenence. the cost of fuel aside, if you think you are saving the planet, all these new products require fuel and raw products to build and deliver. Just the kind of mood I'm in I guess.