How Air Conditioning Works — A Homeowner's Guide
Understanding how your air conditioner works helps you recognize problems early, maintain your system properly, and make informed decisions about repairs and replacements.
The Refrigeration Cycle
Your AC doesn't actually create cold air — it moves heat from inside your home to outside. It does this using a refrigerant that cycles between liquid and gas states, absorbing heat indoors and releasing it outdoors.
The Evaporator Coil
Located in your indoor air handler, the evaporator coil contains cold refrigerant. Warm air from your home passes over the coil, heat transfers to the refrigerant, and cooled air returns to your home. Moisture in the air condenses on the coil, dehumidifying your home.
The Compressor
The compressor is the heart of your AC system, located in the outdoor unit. It compresses the refrigerant gas, raising its temperature and pressure so it can release heat outdoors.
The Condenser Coil
Located in the outdoor unit, the condenser coil releases the heat absorbed from your home into the outdoor air. A fan blows outdoor air over the coil to facilitate heat transfer.
The Expansion Valve
The expansion valve reduces the pressure of the refrigerant, causing it to cool rapidly before entering the evaporator coil. This is what makes the refrigerant cold enough to absorb heat from your home's air.
Your Thermostat
Your thermostat monitors indoor temperature and signals the AC system to run when cooling is needed. Modern smart thermostats can learn your schedule, adjust settings remotely, and provide energy usage data.
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Essential Heating & Air LLC serves Sarasota, Manatee, Hillsborough & Pinellas Counties. License CAC1820412. 4.9-star rating with 277 reviews.