PuroClean of Ormond Beach 
When it comes to your HVAC system, the smallest settings can make the biggest difference — especially that little fan switch labeled “On” or “Auto.” While it may seem harmless to keep your fan running continuously, doing so could be driving up your energy bill, shortening the life of your system, and even affecting your indoor air quality.
Let’s break down why “Auto” is the way to go — and why leaving your fan “On” can cost you more than you think.
🚫 The Downside of “Fan On” All the Time
- Higher Energy Bills
A fan set to “On” runs 24/7 — even when your heating or cooling isn’t active. That means you’re paying to move air for no reason. Over time, that adds up fast. - Faster Wear and Tear
Your system’s fan motor wasn’t built for round-the-clock use. Running it constantly can wear it down prematurely, leading to early breakdowns and costly repairs. - Humidity Problems
During the summer, your HVAC system cools your home and also removes excess moisture from the air. But if the fan keeps running after the cooling cycle ends, it can blow that moisture right back into your home. This can make your space feel muggy and uncomfortable — not exactly the relief you’re looking for on a hot day. - Risk of Mold Growth
High humidity levels indoors don’t just feel bad — they can cause serious problems. Moisture buildup in walls, ceilings, or vents can lead to mold growth, which can damage your home and affect your health. Continuous fan use creates the ideal environment for mold, especially in poorly ventilated or already humid areas. - More Frequent Filter Changes
More airflow means more dust and particles circulating through your home, leading to clogged filters that need to be replaced more often. Dirty filters also reduce system efficiency and indoor air quality.
✅ The Benefits of Keeping It on “Auto”
- Energy Efficiency
The fan only runs when the system is actively heating or cooling, which cuts down on unnecessary energy use and helps lower your utility bills. - Better Moisture Control
“Auto” allows your system to complete its dehumidification process properly. When the cycle ends, the system shuts off completely — so moisture stays out of your indoor air. - Longer System Life
Less run time means less stress on your system components. That can extend the life of your HVAC unit and reduce the need for expensive repairs or replacements. - Cleaner Air
With less dust and allergens being pushed through your home all day, you’ll experience cleaner, healthier air — and your filters will last longer too.
💡 Bottom Line: Let “Auto” Do the Work
Your HVAC system was built to work smart — not hard. Switching your fan setting from “On” to “Auto” is one of the easiest ways to improve energy efficiency, reduce wear and tear, maintain proper humidity levels, and protect your home from mold growth.
Don’t let your HVAC system invite mold into your home — give PuroClean of Ormond Beach a call today at (386) 777-4770 and breathe easier tomorrow!
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