What extras should I insist on in a new Class C

My current heat pump just hit 10 years with few issues. the previous 28 years I must have had 3 or 4 different units. In another house I have two units, one upstairs and one down and I must have gone thru at least 4 or 5 units in 16 years.
but if I had natural gas available, I would immediately switch to that for heat. I mean when 85 degree "warm" air hits you from a heat pump, it is more of a draft than heat.
bumpy