You can reach maximum comfort with a 2-speed air conditioning system. Your air conditioner is sized for the hottest days of the season which are very few days, with a two speed air conditioning system and the same with a 2-speed gas furnace when it’s not as hot outside let’s say 90° or better and you are still using your air conditioner you do not need the full power of the air conditioning system, so if have a two speed air conditioning system the air conditioner will run at a lower level providing you maximum comfort and dehumidification which is very important.