Phase Change For Heating Into The Night

With the ubiquitous solar on home rooftops, and the sunny days and cold sub zero winter nights, it seems to me that we want to have smart heaters that crank the heat up during the day to take advantage of the temperature & abundant power and turn it into heat in a way that will last the night. Enter my product: Phasor Towers. They are basically standalone units that sit over a floor vent and contain phase change material that changes phase at about 24. So the hot air coming out of the vents gets stored, then at night the phase change re-emits the heat and keeps the house warm without using any energy (no sun means you’re paying for it!). No idea if it’s feasible.