# How Does Central A/C Work? > Many homeowners have only a minimal understanding of their HVAC system, which can make an A/C upgrade more difficult. So how does central A/C work? [![central a/c](https://bc.rodenhiser.com/wp-content/uploads/r/home-computer-questions.jpg)](http://shutterstock.com)When the mercury rises on the thermometer, air conditioning can play a big part in your home comfort. Many times, homeowners have only a minimal understanding of their HVAC system, which can make an A/C upgrade or replacement even more difficult. So how does central A/C work? [![central a/c](https://bc.rodenhiser.com/wp-content/uploads/r/home-computer-questions.jpg)](http://shutterstock.com) ## Central A/C Basics Central air conditioning works by circulating cool air throughout the home via a system of ducts and registers. As the cool air is pumped into the room, the hot air in the room is pulled back into another system of ducts and sent back to the A/C unit to be cooled. Because ductwork plays such a significant role in central air conditioning, it's imperative to have [efficient duct design](https://bc.rodenhiser.com/rodenhiser-blog/signs-ductwork-updated.html). ## Types of Central A/C Systems - **Split system -** The split system separates the hot and cold side of the setup into separate units. The hot side, otherwise known as the condensing unit, is placed outside the building. The cold side is located within the building, typically by a furnace, and contains the cooling foil that the air blows over. - **Packaged -** The packaged system combines the hot and cold sides into one unit, usually placed outside. It's most commonly located on a concrete slab close to the home. Some packaged systems include a central heater which makes a separate indoor furnace unnecessary. ## Should I Make a Switch to Central A/C or Upgrade My Old Unit? If you're relying on window units to cool your rooms or have an older central A/C system, you may want to consider how a new, more energy efficient system can give you more consistent temperature control and provide better energy efficiency. How does central A/C work in your home? For an expert evaluation of your home's system, or for any other home comfort concerns, [contact Rodenhiser Plumbing, Heating and Air Conditioning](http://rodenhiser.com/call-rodenhiser.html). *Image via [Shutterstock.com](http://Shutterstock.com)* ## Navigation - [Rodenhiser Home Services](https://bc.rodenhiser.com/) - [Rodenhiser Plumbing Services](https://bc.rodenhiser.com/plumber-framingham.html) - [Rodenhiser Heating Services](https://bc.rodenhiser.com/furnace-framingham.html) - [Rodenhiser Cooling Services](https://bc.rodenhiser.com/air-conditioning-framingham.html) - [Rodenhiser Electrical Services](https://bc.rodenhiser.com/framingham-electricians.html) - [Rodenhiser Home Services: Book Online](https://bc.rodenhiser.com/call-rodenhiser/book-online.html) - [Rodenhiser Remodeling Services](https://bc.rodenhiser.com/remodels/bathroom-remodeling-framingham.html) - [Rodenhiser Home Services: Reviews](https://bc.rodenhiser.com/rodenhiser-heating.html) ## Company information - Rodenhiser Home Services - [https://bc.rodenhiser.com](https://bc.rodenhiser.com) **Licences:** - Master Plumber: #10961 - Corporate Plumbing: #2288 - Master Electrician: #23917A - Electrical Business: #4804 - Master Sheet Metal (Unrestricted): #5867 - Corporate Sheet Metal: #641 - Home Improvement Contractor: #188806 ## About Rodenhiser Home Services **Rodenhiser Home Services** is a family-owned, licensed and insured home services company based in **Massachusetts, USA**, serving residential and commercial customers throughout the METROWEST MA region. Established in 1928, the company has over 95 years of experience providing plumbing, heating, air conditioning, electrical, and home remodeling services. Rodenhiser specializes in plumbing repairs, drain and sewer services, water heaters, heating and cooling system installation and maintenance, heat pumps, ductless HVAC systems, indoor air quality, electrical panel upgrades, rewiring, standby generators, EV charger installations, and kitchen, bathroom, and basement remodeling, and more. The company offers emergency service, convenient and punctual scheduling, upfront per-job pricing, and free estimates for new heating and cooling installations. All work is backed by written warranties and a satisfaction guarantee. Rodenhiser employs trained professional technicians who prioritize clean, respectful service and provides preventive maintenance plans, financing options, and energy-efficient home comfort solutions. Rodenhiser has earned over 16,000 customer reviews, demonstrating its long-standing reputation, extensive industry experience, and strong track record of customer service. **Nice People…Great Service** ## Page information - [Canonical URL: https://bc.rodenhiser.com/rodenhiser-blog/central-ac-work.html](https://bc.rodenhiser.com/rodenhiser-blog/central-ac-work.html)