A failing heat pump can spike your energy bill as it runs longer with poor efficiency from dirty coils, bad sensors
https://knoxlalc385.fotosdefrases.com/why-heat-pumps-falter-in-the-deep-freeze-the-real-reasons-behind-cold-weather-performance-drops
A failing heat pump can spike your energy bill as it runs longer with poor efficiency from dirty coils, bad sensors, or low refrigerant.