OK Benyoung777
Your propane BTUs are 1,053 gallons X 91,333 BTUs/gallon = 96,173,649 BTUs used
Your electricity BTUs = 1818 KWH x 3412 BTUs/KWH = 6,203,016 BTUs used
Total of 102,376,665 BTUs (Which would cost 102,376,665 / 3412 X .19 = $5700 if you were using electric heat and 100% efficiency AC)
So if we assume your heat pump will provide the heat/AC for just 35% of the cost it would be 0.35 X $5700 = $1995 per year, more than your current costs.
You may be correct that a geothermal heat pump would not pay for itself in your case. Your cost of propane is very good. You are paying $1.33 / 91333 = 1.456 times ten to negative five per BTU for propane and .19 / 3412 = 5.568 times ten to negative five for electricity. Clearly electricity is much more expensive be BTU for you and can’t offset the high efficiency of the geothermal system.
You might talk to your salesman and see what he has to say about cost comparisons.
Hope this helps.