Beginners Guide to Ductless HVAC

Ductless HVAC vs Ducted AC

Whenever homeowners prepare for the replacement of an air conditioning system, they may encounter information concerning a new and unfamiliar option. Most homes in the U.S. have ducted central air conditioners. But the applications in which ductless mini-split air conditioners are expanding, including into spaces that are typically reserved for traditional central air systems. If you are unfamiliar with ductless HVAC systems, read on for a simple comparison of the two systems.


Both ducted and ductless systems use the same basic cooling technology. The refrigerant gas is compressed to about 440 pounds per square inch (psi), which heats the gas to around 2000 F. The pressure of the gas inside the coolant lines is then released to about 118 psi in an appropriate cooling chamber. The drop in pressure results in a drop in gas temperature to about 400 F. Inside air is passed over the cold coolant lines, removing humidity and quickly cooling the air moving into the house. For reference, this is like taking air from your refrigerator and distributing it around the house. 1

Both types of systems have two major components, one inside and one outside. The outdoor component is the compressor and condenser unit, generally a boxy-looking cube or cylinder with a big fan inside. The indoor component is called the evaporator chamber, and this is where the two systems become very different.


A traditional ducted central air conditioner system will have a substantial cabinet, often in a closet, garage, or basement. The central portion of the cabinet contains the evaporator coils, where the heat and cold are exchanged. Significant humidity condenses in this chamber and the stream of water is carried away by a drain tube. A large blower motor circulates the entire volume of your home every couple of minutes, so usually, you hear the fan during the cooling cycle. The air moves through a network of ducts to every space in the house—hence the term “ducted.”

A Ductless HVAC system does not have a large, central evaporator chamber, but a much smaller chamber installed in each room. The same process happens but at a fraction of the scale of a ducted system. The fans are much smaller and are very quiet in comparison; it only needs to circulate air in a single room to accomplish the same task as the larger blower fan.

Applicational Advantages of Ductless HVAC

Which system is better? It depends upon the application. Both systems are energy efficient and will serve your home well. Here are some considerations to determine which system is right for your application.

Have questions about Ductless HVAC?

With our four decades of experience as an AC Repair and Ductless HVAC contractor, AirPro Houston provides you with the skill and expertise to assist with the steps to answer questions about Ductless HVAC.

We have several financing options available with great options with up to 72-month terms with approved credit. Call us today at  281-880-8805 and let us partner with you for all of your Furnace Repair, Tune Up maintenance, and AC Replacement needs.

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