Understanding When Water In Your AC Becomes A Problem
Rain brings welcome relief from the heat and helps keep our landscapes lush — but for homeowners with HVAC systems, it can also raise concerns. You may be wondering, “Can rainwater in my AC unit cause damage?”
At Mission Air, we want Richmond residents to feel confident in their home comfort systems, no matter the weather. Let’s break down what you need to know about rain in your outdoor unit.
The Truth About Your Air Conditioner And Rain
Richmond sees its fair share of wet weather — especially during the spring and summer months. Fortunately, standard rainfall typically won’t harm your outdoor air conditioning unit. These systems are designed to be outdoors and built to withstand most weather conditions. This includes rain, wind and humidity.
In fact, a light shower can even help rinse off dirt or pollen buildup on the exterior of your AC. That said, just because your system is rain-resistant doesn’t mean it’s completely invulnerable.
When Water In Your AC Becomes A Problem
Problems arise not from rain itself, but from the amount of water and the conditions surrounding your unit. If your yard has poor drainage or your unit is installed in a low-lying area, heavy rain can create pools of standing water around the base of your system.
This is when things get tricky. An AC unit flooded with standing water can suffer from:
- Electrical short circuits
- Rust or corrosion of internal components
- Damage to the compressor or fan motor
- Mold growth due to excess moisture
- Debris or pests entering the unit through open gaps
What To Do If Your AC Unit Is Flooded
If your unit has been sitting in flood water or has stopped working after a major storm, turn it off at the breaker and contact a professional HVAC technician right away.
If your unit has been sitting in flood water or has stopped working after a major storm, don’t panic — but don’t ignore it, either.
Turn off power to the system at the breaker. This prevents any electrical hazards if water has reached the internal components. Then, call your HVAC technician. A professional can safely inspect, dry and test your system to ensure it’s safe to run again.
Should You Cover Your AC Unit When It Rains?
You may be tempted to cover your unit to keep it dry, but in most cases, it’s not necessary — and in some cases, it can actually do more harm than good. Covering your unit with plastic tarps or bags can trap moisture inside, leading to rust, mold and airflow issues.
If you still want to cover your system for peace of mind, especially before a major storm, use a breathable, waterproof cover designed for HVAC units. Remove it as soon as the weather clears to allow ventilation and prevent moisture buildup.
Are Window AC Units More Vulnerable To Rain?
In Richmond, many homeowners use window units for supplemental or primary cooling. Like central AC systems, window units are generally safe during rain — if they’re installed correctly.
However, because many window units are DIY installations, improper sealing is a common issue. Gaps around the unit can allow water to enter your home and lead to damage such as:
- Moisture buildup inside walls
- Paint peeling or wall discoloration
- Puddles on window sills
- Mold or mildew growth
If you notice any of these warning signs, it’s time to reseal the area around your window unit — or call a pro to reinstall it securely.
Mission Air Is Here To Help Richmond Stay Cool And Dry
When it comes to protecting your home and your comfort, knowledge is key. While a little rain isn’t likely to hurt your outdoor system, excess water in your AC can quickly turn into a problem.
If you suspect rain damage to your air conditioner, Mission Air is here to help. We specialize in Richmond HVAC repairs, replacements and inspections, and we’re always ready to restore your peace of mind. Contact Mission Air today for expert HVAC care and service you can trust.
