There is a hybrid heating and there is something else.
What I saw in a house, was honestly odd.
Hybrid heating usually means that they have a heat pump unit plus they need an additional source of heating for when the temperatures go freezing. Some people consider hybrid heating as having an oil or gas heating system plus a heat pump. The apartment I was in a week back looked what looked like three furnaces. I thought maybe it was a different type of hybrid heater. It truthfully meant that there were three heaters. They had a gas furnace for the main floor of the house. There was an oil heating system in the second floor of the apartment plus the upper floor had a tiny electric furnace. At first I thought they were renting the spaces and each floor got a heater to control. Nope, I was wrong. This was a one family beach house plus only one family was living there. There was a husband, a partner plus baby living on the top floor. They wanted more efficient heating in the house, obviously. I thought they should get one powerful oil furnace rather than multiple inferior heaters. They told myself and others they would look for a better Heating, Ventilation, plus air conditioner supplier that would just give them zoned HVAC so the heating would for sure be in every room. All they wanted was to be warm no matter what floor of the beach house they were on. That is not too much to ask for in my opinion.