This is similar to my wife trying to talk me into installing a mini split AC unit in our 1972 southern NH home.
You know, for the 1-2 months a year that we use AC.
It was going to save us so much money. Much more than the two window units that we own. One of which we got for free.
What a deal. Only $7500 to get one installed that would power two units. Which means based on the extra $100/month the current units add to our monthly electric bill. It will only take 37 years to pay itself off. What a great Return On Investment.
But, mini splits are good for heat as well. I have a heat pump/AC regular unit that heats down to 40, splits go to 0 I'm told. I use my heat pump to heat for April/May and September/October so I only need 4 tons of pellets for Nov-March. The electric bill hardly goes up when using the heatpump. Seems much cheaper than LP heat which is part of my heating solution in the Nov-March months.
“Only $7500 to get one installed that would power two units.”
A dual zone retails for $2k. No way installation is $5500.