One* heat pump will do fine, but you might need a low temperature heat pump depending on where you are. After you factor in that gas is cheaper than electricity

One* heat pump will do fine, but you might need a low temperature heat pump depending on where you are. After you factor in that gas is cheaper than electricity per kWh, the system should save you money as long as it is running at an efficiency higher than ~130%. A contractor should be able to select an appropriate system for you, but if you want to do it yourself, look for yourself, get the 2021 ASHRAE climatic design conditions for your area and choose a heat pump with a minimum operating temperature which is lower than the coldest month 99.6% heating drybulb temperature (DB) (should be the top row, left most temperature). *You would also need a fairly large heat pump, perhaps 7 tons (tons here means tons of refrigeration, or how many tons of ice the system can melt per day) depending on how well insulated you are.