Understanding Air Conditioning

During a hot Georgia summer, having a functioning air conditioner that keeps your home cool is essential. When an air conditioner is working to keep your home comfortable, it doesn’t just “create cold air”; it removes heat from the air indoors. When hot weather rolls around each year, you probably enjoy an air conditioner-created climate — but have you ever thought to yourself, ‘How do air conditioners actually work?’ Our experts at Lawson HVAC & Plumbing have put together this simplified guide to understanding your air conditioner system.

Understanding the Basics: Heat Transfer & Refrigerant

Thermodynamics, the science of how heat moves, plays a key role in how air conditioners function. According to the rules of thermodynamics, heat will naturally move from hot spaces to cold spaces on its own. AC units reverse this flow by moving heat from a cool space (indoors) to a warmer space (outdoors). In order to force heat to flow backwards, air conditioners must use a special fluid known as refrigerant.

Refrigerant is a chemical fluid that helps AC units absorb heat from one place and release it in another by transitioning between liquid and gas states. When refrigerant evaporates, it sucks up hot air and deposits it outside. Then, the liquid cools back down as it returns through a valve to begin the process all over again.

Key Components of an Air Conditioner

Here’s a breakdown of the main components of an air conditioner and how they all function together:

1. The Compressor (Outdoor Unit): The compressor’s main role is to pressurize the liquid refrigerant and pump it through the system by compressing the refrigerant in its gaseous form.
2. The Condenser Coil (Outdoor Unit): The condenser coil releases absorbed heat into the outside air as the pressurized gas flows through it.
3. The Expansion Valve (Indoor/Outdoor Junction): The expansion valve depressurizes the refrigerant to cool it down dramatically before entering the evaporator, while also controlling the amount of refrigerant that flows into the evaporator.
4. The Evaporator Coil (Indoor Unit): The evaporator coil absorbs heat from warm indoor air passing over it, while dehumidifying the air.
5. Blower Fan & Air Filters: Finally, the blower fan circulates the newly cooled, filtered air throughout the home as the air filters prevent dust, debris, and allergens from recirculating.

The Air Conditioning Cooling Cycle

This sequential guide illustrates the complete cooling loop, step by step:

Step 1: Warm air in the house is pulled into the system by the fan.

Step 2: Refrigerant in the evaporator coil absorbs the heat, evaporating into a gas.

Step 3: The compressor squeezes the gas, raising its temperature and pressure.

Step 4: The condenser coil dumps the heat outside, returning the refrigerant to a liquid state.

Step 5: Cool, refreshed air is blown back into your living space.

Common Signs Your AC System Needs Professional Care

For the air conditioning cooling cycle to work efficiently, each and every individual component must be functioning correctly. If you notice any of these signs, it could be an indication that your AC unit is in need of a tune-up:

• Reduced cooling capacity or warm air blowing.
• Unusual noises coming from the outdoor compressor or indoor fan.
• Refrigerant leaks (hissing sounds or ice buildup on coils).
• High energy bills, which could indicate inefficiency.

To summarize, your air conditioner relies on a continuous loop of heat removal, powered by key components like the compressor and refrigerant liquid. AC units should undergo regular maintenance to ensure your system is running smoothly and efficiently. To see the services offered by Lawson’s expert technicians, click here.

If you’re ready to understand the health of your air conditioner, schedule a visit today! We’re ready to help keep your home as comfortable as it can be.