Have you ever heard a strange noise from your A/C or wondered why your outside unit is leaking? We’ve gathered some of the most common questions our technicians hear this time of year to help you troubleshoot issues and prepare your system for the changing seasons.
Strange A/C Noises
As we transition to cooler months, unusual noises from your A/C can be unsettling. They might indicate underlying issues that need attention. Understanding these sounds can help prevent bigger problems later.
“My A/C is making a weird rattling sound. What could be causing that, and is it serious?”
A rattling sound often points to loose or broken parts. Common culprits include:
- Loose screws
- Debris in the blower fan
- A worn-out or unstable motor
What to do:
- Check for debris: Make sure no leaves or twigs are stuck inside the unit.
- Inspect screws and panels: Tighten anything that might vibrate.
- Look at the motor: If the motor isn’t secure, it may need professional attention.
Note: 70% of ignored rattling issues lead to more costly repairs later.
“I’m hearing a buzzing or humming noise. What does that mean?”
Buzzing or humming usually means electrical trouble—often a faulty relay switch or failing motor.
Try this first:
- Check wire connections
- Inspect the fan motor
If the noise persists, call a professional. Unattended electrical problems can increase energy use—or worse, create a fire hazard.
A/C Water Leaks
Water leaks are a common concern as seasons shift. Identifying the cause early can help you avoid damage and maintain performance.
“Why is my A/C’s outside unit leaking water?”
Some water around the outside unit is normal condensation. But if it seems excessive, it could mean:
- Clogged condensate drain line
- Low refrigerant levels, causing the coil to freeze and thaw
What to check:
- Clear the drain line
- Have refrigerant levels inspected
Routine checks like these can prevent future issues.
“My unit is leaking water inside the house. What’s going on?”
Indoor leaks usually point to:
- Clogged drain lines
- An overflowing drip pan
What to do:
- Unclog the drain line: A wet/dry vacuum usually does the trick.
- Empty the drip pan
Always address indoor leaks quickly to avoid water damage and mold growth.
Preparing for Season’s End
As summer winds down, now’s the perfect time to prep your A/C system for downtime and protect it for next year.
“How do I prepare my A/C for the offseason?”
Follow these end-of-season steps:
- Clean the unit: Remove leaves, dirt, and debris
- Inspect for damage: Look for cracked or broken parts
- Cover the unit: Use a breathable cover to protect from moisture and pests
These steps help keep your system efficient and extend its lifespan.
“What temperature should I set my thermostat to right now?”
As outside temps drop, aim to balance comfort and efficiency:
- Set thermostat to 78°F
- Avoid turning it off completely—adjust instead to reduce humidity and prevent mold
Have more A/C questions? Our technicians are always here to help. And don’t forget: You may be eligible for rebates on high-efficiency systems through the Efficiency Maine program.
Visit our Efficiency Maine page to learn more.
