Taking a look at the major concerns around replacing an 80% furnace with a high-efficiency one such as venting requirements, drilling extra holes, and financial costs.
The final rule from the U.S. Department of Energy, issued recently, requires newly manufactured indoor residential gas furnaces to be at least 95% efficient starting in December 2028, meaning furnaces made after then will have to be condensing models.
A Google search for terms like “furnace” or “heat pump” will yield information on how the system works and its efficiency, plus side-by-side comparisons and, if applicable, available financial incentives that can defray the consumer’s costs.
The NPF Hydro-furnace, Navien Inc. s first HVAC product, claims an annual fuel utilization efficiency of 97% and can be outfitted to burn either natural gas or liquid propane.