With all the talk about confusion on which equipment to buy being it 12 SEER or 20 SEER. This brand or that brand. 80+% or 90+%. With all this talk why we do not talk more about proper sizing. The increased fuel savings and improved comfort levels of properly sized equipment is so dramatic and everyday many many many units are installed at 100 to 200% over sized. This wastes fuel and increases maintenance. As professionals we need to emphasize the importance of proper sizing of equipment. I have been asking around the heating and air conditioning companies if they do a heat loss. I am surprised that less that 15% actually does a heat loss/gain when replacing equipment.
The second thing is with boilers about half will actually properly adjust the heating curve on outdoor reset controls.
Our industry has been talking about heat loss/gains for many years. It is easier to just size from rules of thumb. We would have been much further ahead giving tax breaks on actual heat loss calculations than efficiencies.
Again, as professionals we must do what we can to properly size equipment which means lower equipment costs, improved comfort, less maintenance, increased efficiency and less noise.