How to Handle Rust on Your HVAC Unit

Rust on Your HVAC Unit? Here's What to Do

Rust on your HVAC unit is a sign there may be some trouble. If you’ve noticed a few orange spots on your AC or heater, don’t ignore them. Rust can sneak in and quietly wear down critical components, eventually causing breakdowns, poor performance, or even total system failure.

Why Rust Happens in the First Place

Texas weather is no joke. Between the humidity, seasonal storms, and long cooling seasons, your HVAC unit has to battle moisture nearly year-round. Here’s why rust might be popping up:

• Condensation buildup: Air conditioners naturally produce condensation, and if it’s not draining properly, that moisture can linger.

• Outdoor exposure: Units exposed to rain or sprinkler systems are more prone to corrosion.

• Leaky ductwork or water lines: Sometimes the problem isn’t the system itself, but what’s dripping nearby.

What Rust Can Damage

Rust doesn’t stop at surface-level cosmetics. It can hit important parts like:

• Coils: Rusty coils reduce airflow and efficiency.

• Drain pans: These can crack and leak over time, leading to water damage.

• Metal framing or supports: Structural rust can lead to wobbly units and unsafe setups.

• Heat exchangers: In a furnace, rust here is a major safety concern. If it’s compromised, it can release carbon monoxide.

How to Deal With It

1. Catch it early

A little rust on the outside? Not ideal, but not a death sentence. Wipe it down, keep an eye on it, and call us if you’re unsure.

2. Schedule a check-up

If you’re spotting rust inside the unit, around the coils, or in the drain pan, it’s time for a professional inspection. Greentex will take a look and let you know what’s salvageable and what’s not.

3. Stay on top of maintenance

Regular cleanings, filter changes, and professional tune-ups keep moisture and gunk from building up.

4. Upgrade worn parts

If parts are already rusted through, we’ll help you replace only what’s necessary—no unnecessary upsells.

How to Prevent Rust Moving Forward

• Use anti-corrosion sprays or coatings on vulnerable outdoor parts.

• Keep the unit covered during the off-season (but make sure it can still breathe).

• Fix leaks and standing water issues around the system ASAP.

Don’t Wait for It to Get Worse

Rust is one of those problems that only gets more expensive the longer it’s ignored. If you have questions, let Greentex Coolers take a look.