Pesky desert critters clogging up your HVAC units? No way! Well… yes, way. Small creatures such as rats, mice, and birds seek out certain components of your HVAC system for shelter to keep them warm and out of bad weather. Also, for food and water sources. Sometimes they may not find a way into your home, but rather into your AC unit itself. Our technicians have opened up plenty of units where mice have found their way into the AC condenser and built a nest! The varmints will get in there, chew through the electrical components, and cause the system to shut down. Luckily, there are a few things you can do to try to deter these little critters.
Clear the area around your AC condenser.
First, try to clear the area around your AC unit. We all love beautiful plants and landscapes, but if there are plants, this also makes for a great place for little critters to hide. Plus, this becomes a reliable water source for backyard critters if you water your plants often. Because of this, it’s recommended to keep the area around your AC clear and clean so there isn’t anything to attract mice.
Try planting certain kinds of plants.
In fact, some plants and herbs actually deter mice and other critters. Rosemary, lavender, garlic, and many other plants can add a beautiful addition outside your home and also keep these pests away.
Seal Entry Points Around the HVAC System
Even small gaps around your HVAC unit can give mice easy access. Inspect the area around your outdoor condenser and indoor HVAC connections for holes, cracks, or loose panels. Mice can enter your HVAC system through extremely small gaps, including openings no larger than a coin.
What you can do:
- Seal gaps with steel wool or hardware cloth
- Repair damaged panels or insulation
- Make sure access covers are tightly secured
Sealing these entry points helps prevent mice from entering the system.
Install Rodent Guards or Mesh Screens
One of the most effective long-term solutions is installing rodent guards or wire mesh screens around vulnerable HVAC openings. These allow proper airflow while preventing mice and birds from entering the unit. A professional HVAC technician can install these guards correctly without restricting performance.
Avoid Leaving Food Sources Nearby
Mice are attracted to food just as much as shelter. Outdoor pet food, trash cans, bird feeders, or fallen fruit near your AC unit can draw rodents straight to your HVAC system.
Tips to reduce attraction:
- Keep trash bins sealed
- Move bird feeders away from the AC unit.
- Clean up any fallen food or debris regularly.
Removing food sources makes your HVAC area much less inviting.
Use Safe Pest Deterrents Around the Unit
Several non-toxic pest deterrents can help keep mice away from your HVAC system. These include natural repellents and commercially available rodent-deterrent packs designed for outdoor use.
Avoid placing poisons inside or near your AC unit, as this can lead to dead rodents in the system and cause odors or health issues.
Schedule Professional HVAC Maintenance
Regular HVAC maintenance not only keeps your system efficient—it also helps detect early signs of pest activity. During routine inspections, technicians can spot chewed wires, nesting material, or entry points before serious damage occurs. Preventative maintenance can save you from costly emergency repairs caused by rodents.
SignsIt’ss Time to Call a Professional
If you notice any of the following,it’ss best to contact an HVAC expert immediately:
- Scratching or scurrying sounds near the unit
- The AC unit is not turning on or shutting off unexpectedly.
- Unusual electrical smells
- Visible nesting material or droppings
Ignoring these warning signs can result in serious system damage.
Still having pest problems in your AC? Call Oasis Air!
If your unit isn’t working properly – or you suspect you have pests in your AC system – call our friendly staff today to set up an appointment with one of our professional HVAC technicians. We’ll set up an AC repair visit for you, and they’ll find out where the pests are coming from and how they can keep them from getting back in.