How Does an AC work?- Basics

Tom Markley • June 30, 2021

An air conditioner can change the temperature, humidity or general quality of the air. More specifically, an air conditioner makes your home cooler, by drawing heat energy out of the house and transferring that heat to the outdoors, then replacing the air inside your home with cooler air.


The air conditioner in a central heating and cooling system provides cool air through ductwork inside your home, by providing a process that draws out the warm air inside, removing its heat.


In a split system, the compressor condenses and circulates the refrigerant through the outdoor unit, changing it from a gas to a liquid. The liquid is then forced through the indoor evaporator coil or cooling compartment. The indoor unit’s fan circulates the inside air to pass across the evaporator fins. The evaporator’s metal fins exchange the thermal energy with the air around it. There, the refrigerant turns from liquid into vapor, removing any heat from the surrounding air. As the heat is removed from the air, the air is cooled and blown back into the house.


From that point, the condenser or outdoor unit then turns the refrigerant vapor back into a liquid, removing any heat. By the time the fluid leaves the evaporator again, it is a cool, low-pressure gas, eventually returning to the condenser to begin its trip all over again. This process continues again and again until your home reaches the cooling temperature you want, as programmed and sensed by your thermostat setting.


If you are in need of service to your AC Unit or would like to get a quote on a new system, please contact us at Alpine Heating & Cooling at one of the below methods.


P: (330) 359.7114 or (330) 263.0013


E: sales@alpinehcservices.com

People walking in winter snow storm
By Tom Markley December 10, 2025
Don’t panic—get warm fast! Follow these expert steps to troubleshoot your heater and stay safe when the heat goes out in the middle of winter.
By Tom Markley November 26, 2025
Cold Hands in Sweater
November 19, 2025
Northeast Ohio homes often feel cold even at 72°. Learn why comfort drops despite a warm thermostat and how Alpine Heating & Cooling can fix the real causes fast.
Pipe bursting from cold temperature
November 12, 2025
Protect your home from frozen pipes! Follow these 5 quick tips to prevent costly pipe bursts and keep your plumbing safe during winter.
October 27, 2025
Help Us... Help Others !!! From Today until Thanksgiving for each Like and/or Share this post on any of our social media channels we will donate $10 (Up to $2,000.00 Total) to CCHO to support their Thanksgiving Program. Each Like and/or Share provides a child with a meal for Thanksgiving! To learn more about this great program and the great work they are doing in our area check out the link below and to help out please visit our any of our social media channels and Like/Share !!! https://www.ccho.org/gift (IG LINK IN BIO)
October 22, 2025
Compare heating fuel options with Alpine Heating & Cooling’s guide to understanding the fuel factor and making informed heating choices.
October 14, 2025
Feel better with better comfort! Discover how temperature and indoor climate affect your health, mood, and daily energy levels.
CARTOON FURNACE HOLDING THERMOSTAT
October 8, 2025
This fun HVAC mascot stands in a warm living room, smiling with a thermostat in hand, symbolizing efficient home heating and dependable furnace service.
HAND TURNING ON FAN
October 1, 2025
Stay warm and save this fall! Learn how to use your ceiling fan the right way to boost home comfort and ease the load on your heating system.
Friends watching football together at home
September 17, 2025
When the leaves start to fall and football kicks off, your furnace becomes as important as your favorite quarterback. Game days mean crowded living rooms.
More Posts