We are building a new house. I need to select the guts for the heating/cooling. Solar and geothermal are not feasible. How does one whittle down the options/brands/models for a high efficiency (.95+) gas furnace? My builder is recommending a Trane furnace and cooling units. For hot water, he is suggesting tankless Navien units (NR-240A). I’m just not sure how to consider other brands and/or options. Any suggestions are greatly appreciated.