So the contractor I'm leaning towards gave me the AHRI cert on the matched system with the 4A6H3036 heat pump. The numbers are very similar to the 4A6H5036 but with better heating numbers just as you had mentioned. One of the reasons he mentioned for the price diff is the quietness of the 4A6H5036. Do you think the db level is that much different? Also, is an HSPF difference of 0.5 (9.0 vs 8.5) noticeable?