What do you guys recommend for an efficientcy rating for a replacement furnace for a rental property? I was told by the contractor that the 80% ones would be about $1000 less than the 90%+ ones. The tenant pays utilities so thats not a huge concern of mine. He also told me the 80% are much nosier, which would be a concern, if thats the case. Are both systems equally reliabe and trouble-free? I dont have any drains nearby, so I dont know if thats a problem with the condensation pump on the more efficent models. Thanks for any advice.