You installers should consider mini splits. I had window and wall mount ACs in my older home which is steam heat, no ducting. 3 yrs ago I installed 1 mini split with 2 heads and I will never look back at windows again. How many heads you need is going to vary house to house of course. I had mine installed professionally (huge BTU unit), but you can buy DIY kits and it doesn't seem too hard for a middle of the roader handyman. I could have done a small single head. I spend about 20% less for cooling season, but the house is way more comfortable. Those things dehumidify especially well. They also heat - shoulder season it's cheaper than oil for sure.
I also recommend an electric heat pump water heater if you need to replace an electric one and you don't have gas. Keeps my basement cool and dry all year, and cheap hot water to boot!