By automatically switching between the heat pump and the furnace based on outdoor temperatures, a dual fuel heating system ensures that your home remains comfortable while helping keep energy ...

“We designed the system for phased installation, allowing contractors to quickly restore heat with a heat-pump-ready boiler during winter, and add the outdoor heat pump in warmer months to ...

An international research team has developed a novel solar-air dual-source heat pump (SAHP) for water heating applications. The system's innovation lies in using a blower fan that enables forced ...

They found that the heat pump was best for comfort and cost $228 less per year to operate than a dual-fuel AC and gas furnace system. The graph below shows the indoor temperature in the four ...