I have been lurking and learning for some time but finally registered to post on this phenomenal site. I have read through the posts on this matter but I am wrestling with discussions between my installer and I along with data I continue to collect. I am hoping for some real world experience based replies or technical thoughts here. I have a fairly standard 16X32 IG pool and a local installer has suggested either an ultra temp 120 heat pump for about 4300 installed, or a max-e-therm 400k btu natural gas heater for about 2900 plus whatever it takes to extend a gas line installed. Of course prior posts and the installer have pointed to the efficiency of the heat pump. My realities are 1) live in an area of exceptionally high humidity for much of the year (Memphis), 2) natural gas is about $1.08 per ccf or "therm"' and 3) electric is about 6.5 cents per kwh so hopefully I am correct in understanding that given 1 therm = 29.3 kwh the therm equivalent cost on the electric side is about $1.90.
I am going back and forth between up front cost difference of about 1000 more for the heat pump vs longer term efficiency and running costs. If there are others who have looked at this recently and come to a logical conclusion I would love to hear your thoughts.