10 Common HVAC Myths Roanoke Homeowners Should Stop Believing in 2025

Introduction

When it comes to keeping your Roanoke home comfortable year-round, your HVAC system plays a vital role — yet there's a lot of misinformation floating around about how heating and cooling systems actually work. Falling for these common HVAC myths can lead to higher energy bills, costly repairs, and poor indoor air quality.

At Three Rivers LLC, we’ve spent years helping Roanoke homeowners make informed decisions about their HVAC systems. Here are 10 of the most common myths — and the truth you need to know in 2025.

1. Myth: Turning the Thermostat Way Down Cools the Home Faster

Fact: Your HVAC system works at a constant rate — it doesn’t speed up when you set the thermostat lower. Setting it to 60°F won’t cool your home faster than setting it to 72°F — it’ll just overwork the system.

2. Myth: HVAC Maintenance Isn’t Necessary Unless Something Breaks

Fact: Regular maintenance extends the lifespan of your system, improves energy efficiency, and helps you avoid expensive emergency repairs. We recommend biannual checkups — especially before summer and winter in Roanoke.

3. Myth: Bigger Systems Mean Better Performance

Fact: An oversized HVAC unit can cause short cycling, uneven cooling, and increased wear and tear. HVAC systems should be properly sized for your home — that’s something our experts at Three Rivers LLC can assess with a load calculation.

4. Myth: Air Filters Only Need Replacing Once a Year

Fact: In Roanoke's climate, where pollen, humidity, and seasonal allergens are common, air filters should be changed every 1–3 months for optimal air quality and airflow.

5. Myth: Closing Vents in Unused Rooms Saves Energy

Fact: Your HVAC system is designed to distribute air evenly throughout your home. Closing vents increases pressure in the ductwork, which can cause leaks or damage over time — and raise your energy costs.

6. Myth: Ceiling Fans Cool the Room

Fact: Ceiling fans don’t lower temperature — they circulate air to make you feel cooler. They’re great for comfort, but don’t rely on them to replace AC use in the peak of Roanoke’s summer heat.

7. Myth: You Can Install a Smart Thermostat Without Professional Help

Fact: While DIY installation might seem simple, smart thermostats often require compatibility checks and wiring adjustments. Let a licensed HVAC technician ensure it’s installed correctly and safely.

8. Myth: It’s Normal for the AC to Smell a Little Musty

Fact: Musty smells indicate mold or mildew inside your HVAC system — a major health hazard. If you notice unusual odors, contact Three Rivers LLC immediately for a full system inspection.

9. Myth: You Should Cover Outdoor Units During Winter

Fact: HVAC condenser units are built to withstand Roanoke winters. Covering them can actually trap moisture, leading to rust or pest infestations. A simple top cover is fine — but skip the full wrap.

10. Myth: All HVAC Contractors Are the Same

Fact: Licensing, experience, and customer service matter. At Three Rivers LLC, we pride ourselves on delivering expert, affordable HVAC solutions backed by years of trust from Roanoke homeowners.

Final Thoughts

When it comes to your HVAC system, knowledge is power — and avoiding these myths can save you serious time, money, and frustration. Whether you need routine maintenance, a system upgrade, or a second opinion, Three Rivers LLC is Roanoke’s trusted partner for reliable heating and cooling services.

Need HVAC help in Roanoke?
Call Three Rivers LLC today or schedule your service online. Let us help you stay comfortable and efficient all year long.