What Is Refrigerant? — How It Cools Your Home
Refrigerant is the chemical compound that makes air conditioning possible. It's the working fluid that absorbs heat from your indoor air and releases it outside — the fundamental mechanism behind every air conditioner, heat pump, and refrigerator. Understanding refrigerant helps you identify AC problems early and make informed decisions about repairs and replacements.
How Refrigerant Works
Refrigerant works by exploiting the physics of phase change — when a liquid becomes a gas, it absorbs heat, and when a gas becomes a liquid, it releases heat. Your AC continuously cycles refrigerant between liquid (in the evaporator, absorbing indoor heat) and gas (in the condenser, releasing heat outdoors). This process allows your AC to 'pump' heat out of your home against the natural direction of heat flow.
Types of Refrigerant
**R-22 (Freon)**: The industry standard for decades, R-22 was phased out in 2020 due to ozone damage. It's no longer manufactured, making it extremely expensive ($100-$200 per pound). If your system uses R-22, replacement is recommended. **R-410A (Puron)**: The current standard, more environmentally friendly and more efficient than R-22. Most systems installed since 2010 use R-410A. **R-32**: A newer refrigerant used in some modern systems, even more efficient with lower environmental impact.
Signs of a Refrigerant Leak
Common signs include: warm air from vents despite the AC running, ice forming on the refrigerant lines or evaporator coil, hissing or bubbling sounds near the indoor unit, higher-than-normal electricity bills, and the AC cycling on and off frequently. Refrigerant doesn't 'run out' — if levels are low, there's a leak that needs professional repair.
Why Refrigerant Leaks Are Serious
Running your AC with low refrigerant causes the compressor to overheat, potentially leading to compressor failure — the most expensive AC repair ($1,200-$2,800). It also reduces cooling capacity, increases energy consumption, and can cause the evaporator coil to freeze. Environmental regulations require that refrigerant leaks be repaired, not just recharged.
Frequently Asked Questions
What is refrigerant in AC?+
Does AC refrigerant need to be refilled?+
How much does refrigerant cost?+
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Expert-Reviewed — What Is Refrigerant? — How It Cools Your Home
Robert Williams
Maintenance & Efficiency Specialist
Robert focuses on preventive maintenance and energy optimization, helping Houston homeowners reduce cooling costs by 20–35% through proper system tuning. He holds BPI (Building Performance Institute) certification and has conducted over 5,000 seasonal HVAC tune-ups.
"Robert's maintenance visit cut our electric bill by $80/month. Worth every penny."
— Verified Customer
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