Yes, you can get your furnace and AC replaced on the same appointment. When installing a new furnace, the Tasker will need to open the entire HVAC (Heating, Ventilation, and Air Conditioning) system. So if you already have an old air conditioning system, you may opt to have the furnace and AC replacement done simultaneously. Doing so could save you time and money in the long run. Also, you may spend less on repairs and on the installation itself.