For a utility that means less system capacity to maintain and lower peak demand. The lower installed heating capacity didn't pose a major problem. The radiant panels kept up, even when the outside temperature dropped below the design temperature of 13 degrees F for morethan 24 hours. Cooling The major limitation of radiant heat is that it can't cool the house. Installing a ducted central air conditioner would undermine many of the advantages of using the radiant panels.
Refrigerant carries heat between the units.
Mini-splits blow cool air directly into the room instead of through ducts. In the NAHB study, both occupants preferred the radiant system over the heat pump, even before they knew of the money it saved. Even in the same room, they could position themselves for greatest comfort. The panels operated quietly and without air movement. Sinus comfort was higher with the radiant panels.