the reason you can't find such a website is that the great unwashed majority don't care about the mechanical system in their home. that will change for sure. to most people its a switch on a wall. turn it on and you are comfortable. with ng and electric rates going up(not to mention heating oil for our yankee friends) mechanical systems will become very important. here in texas real estate agents have never seen fit to even mention the age, condition,brand or efficiency of the a/c and heating system when showing a home. they just give the buyer a home warranty and deposit the check. i truly believe that now and in the future the mechanical system will finally take itr rightful place front and center in home purchasing and home ownership. when's the last time they showed the mechanical install crew on one of those "flip this house" shows? never!they show the plumbers,but water is not going up every day. i guess i'm just bitter that the most expensive system in the home gets no notice until it doesn't work$$$$
"When the people find they can vote themselves money,that will herald the end of the republic" - Benjamin Franklin
"Government is not reason, it is not eloquence, it is force;like fire, a troublesome servant and a fearful master. Never for a moment should it be left to irresponsible action"- George Washington