Do you have to replace your furnace if air conditioning unit?

Replacing a functional furnace is not necessary when installing an air conditioning unit. Both systems have different functions: furnaces heat homes during cold weather, while air conditioners cool them during warm weather. You may want to replace a furnace if it is old, inefficient, or needs significant repairs. Combining a new air conditioning unit with an existing functional furnace can provide heating and cooling solutions for year-round comfort. This also allows for individual temperature control during different seasons.