When it comes to your home’s air conditioning system, the materials used in your piping can make a significant difference in performance and longevity.
Two of the most common options are copper and PEX (cross-linked polyethylene), but which one is better for your AC system?
Let’s break down the differences to help you make an informed decision.
Durability and Longevity
Copper pipes have been a staple in HVAC and plumbing systems for decades due to their durability. With a lifespan of 50 to 70 years, copper withstands extreme temperatures and resists UV damage, making it a strong contender for AC systems. However, it is susceptible to corrosion, especially in areas with acidic water.
On the other hand, PEX piping lasts about 30 to 50 years and is highly resistant to corrosion and mineral buildup. However, it is more vulnerable to UV rays, meaning it should not be exposed to direct sunlight for extended periods.
Ease of Installation
One of the biggest advantages of PEX over copper is its ease of installation. PEX is flexible, allowing it to be snaked through walls and tight spaces without the need for extensive cutting and soldering. This makes it a cost-effective option, especially for DIYers looking to tackle small AC-related projects.
Copper, while durable, requires precise cutting, welding, and sealing, making installation more labor-intensive. This means higher labor costs if you’re hiring a professional.
Performance in an AC System
Both PEX and copper have their strengths in HVAC applications, but copper is often preferred in AC systems due to its ability to handle high-pressure refrigerants and extreme temperatures. Copper is also less likely to develop leaks under high-pressure conditions, making it ideal for refrigerant lines.
PEX, while great for water supply lines, is not typically used for refrigerant lines in AC systems because it cannot handle the high pressures and temperatures required. However, it can still be useful for condensate drain lines and certain low-pressure applications within an HVAC system.
Cost Comparison
PEX is significantly cheaper than copper, often costing 20% to 80% less. The lower cost of materials and installation makes PEX an attractive option for homeowners on a budget. Copper, however, comes with a higher price tag due to its material costs and the labor-intensive installation process.
Final Verdict – Which One Is Best for Your AC System?
For high-pressure refrigerant lines, copper is the clear winner due to its durability, heat resistance, and performance under extreme conditions. However, if you’re looking for an affordable and easy-to-install material for condensate drains or non-refrigerant HVAC applications, PEX can be a viable option.
