Bids have been all over the place. Finally got to look at load calculations and I think I now understand. With one exception the load cals are close. How the bidders use the load cals is what is different. Some bidders are using the cooling load as a basis for equipment needs. Others are using the full heat load in order to ensure that heat strips are not used. Designing to heat load means that in cooling mode the equipment is greatly over sized. The contractor said not to worry, we will set up your equipment to run cooling only on the first stage. But I am paying for a two stage system! The folks who bid based on cooling load are sizing the unit to run well in cooling but the unit is not producing enough heat without back up. Both camps are set in their positions, "this is how we bid".
As the consumer, buying a do all heat solution, I will find myself paying for cooling equipment I will not use, higher operating costs. One contractor said each ton more than I need will cost me about $15/month. Too small and I pay for expensive back up heat. I am about to throw in the towel and go with a seer 19 air source. Any advice?