Spring is here. Summer is right around the corner. The grass is growing, mulch is going down, and everyone’s getting their yard back in shape. But while you’re making your home look great on the outside, there’s one thing that often gets overlooked, your AC unit.
Every year, we see the same issue: outdoor units slowly getting buried under grass clippings, mulch, and debris. It doesn’t happen all at once, which is why it’s easy to miss. But over time, it can cause some real problems for your system.
What’s Actually Happing to Your AC
Your outdoor unit’s job is to remove heat from your home and release it outside, and for that to work properly, it needs open space and steady airflow. When mulch and grass clippings start piling up around the unit, that airflow becomes restricted, which causes heat to get trapped instead of being released. As a result, your system has to work much harder to push that heat out and keep your home cool. It’s not just about what you can see, either, fine debris like grass clippings can get pulled into the coils, clogging them and making the problem even worse over time.
Why Mulch Is a Bigger Problem Than You Think
Mulch might look clean and intentional, but around your AC unit, it can actually cause more harm than good. It holds moisture, and when damp mulch sits against your unit for long periods, it can lead to rust and corrosion over time. It also shifts easily, rain, wind, and even mowing can push mulch directly up against or into the unit without you noticing. On top of that, it builds up faster than most homeowners expect; what starts as a thin, harmless layer can quickly turn into a thick barrier that restricts airflow. We often see situations where mulch has been piled too high around the base of the unit, partially blocking airflow from the bottom up, which is one of the most important areas for proper system operation.
What You Should Be Doing This Season
The good news is this is easy to stay ahead of with a simple routine. As you’re mowing and refreshing your landscaping, make sure to keep mulch pulled back from the unit so it’s not touching the base, and pay attention to where your mower is blowing grass clippings so they aren’t being directed toward the system. After yard work, take a moment to clear away any buildup that may have collected around the unit, and always aim to maintain at least 2–3 feet of open space around it so it can breathe properly.
We also recommend using a normal garden hose (not high pressure) to gently rinse off the outside of the unit if you notice grass clippings or debris sticking to it. This helps keep the coils clean and airflow moving the way it should.
Another big improvement many homeowners overlook is the position of the unit itself. If your system is sitting directly on the ground, it can be more prone to collecting debris, moisture, and buildup. We recommend having a professional elevate the system so it’s raised off the ground, which helps with drainage, keeps it cleaner, and protects it long-term.
A quick habit that makes a big difference is to walk over to your AC after each mow, if it looks covered or crowded, clear it out. It takes less than a minute, but it can help prevent bigger and more expensive issues down the road.
A Simple Step That Protects Your System
Your AC is one of the most important (and expensive) systems in your home. Taking a little extra care during spring and summer yard work goes a long way in keeping it running efficiently and reliably. If you’re ever unsure whether your unit has buildup or needs a professional cleaning, we’re always here to take a look and make sure everything is ready for the heat ahead. Keeping it clear isn’t just about looks, it’s about performance, protection, and peace of mind.