My Grandparents’ dwelling was built in the 1930s, & its original heating system consists of a boiler & radiators. The extended family has been discussing having central A/C installed for them because on humid afternoons, both my Grandmother & Grandpa have difficulty breathing. We’ve had several Heating & A/C corporations deliver us quotes & chances for the installation of central A/C, then naturally, my good friend and I could install window units ourselves, but my good friend and I would rather have the entire dwelling cooled evenly, also, because window units are so noisy, my Grandparents would sacrifice what they are able to hear. They both have hearing aids & struggle with deciphering each other’s conversations, but one cooling specialist told us that my good friend and I could install air duct in the house, but it would require breaking holes in the walls & ceilings in order to do so. And if the installer made any errors, the original plaster & woodwork could be harmd. And sacrificing space for the air duct means losing closet space or lowering ceilings. One Heating & A/C corporation told us about VRF, or variant refrigerant flow, systems. This is a ductless system that uses one outdoor condensing unit that affixs to many indoor units, then vRFs deliver each zone the power to control its own temperature. The seventh corporation encouraged us to go with ductless mini split systems, in which outdoor & indoor units are affixed with a small conduit with refrigerant & electrical lines… Mini splits are small systems which are most often used to cool one or two rooms. After quite a bit of discussion among the extended family, my good friend and I decided to use the variant refrigerant flow system.