Your HVAC system is a critical part of your home’s comfort and air quality, but with so much information available, it’s easy to fall for common myths about how it works or how to care for it. These misconceptions can cost you money, reduce your system’s efficiency, or even lead to unnecessary repairs.
In this post, we’re breaking down some of the most common HVAC myths so you can make informed decisions about your system and keep your home running smoothly.

Myth 1: You Only Need to Change Your Filter Once a Year
Truth: Regularly changing your air filter is one of the simplest and most effective ways to maintain your HVAC system’s efficiency. Most filters should be replaced every 1–3 months, depending on factors like pet ownership, allergies, and how often you use your system. Dirty filters restrict airflow, making your system work harder and increasing energy costs.
Myth 2: Closing Vents in Unused Rooms Saves Energy
Truth: It might seem logical to close vents in rooms you don’t use, but this can actually strain your HVAC system. Closing vents disrupts airflow and increases pressure in the system, which can lead to leaks, decreased efficiency, and even damage over time. Instead, consider installing a zoning system to control temperatures in different areas of your home more effectively.
Myth 3: Your HVAC System Only Needs Maintenance When Something Breaks
Truth: Preventative maintenance is key to keeping your HVAC system running efficiently and avoiding costly repairs. Scheduling a professional inspection and tune-up at least once a year can extend the life of your system, improve performance, and catch small issues before they turn into major problems.
Myth 4: Bigger HVAC Systems Are Always Better
Truth: An oversized HVAC system can cause more harm than good. Systems that are too large for your home cycle on and off frequently, leading to uneven temperatures, higher energy bills, and excessive wear and tear. A properly sized system, determined by a professional, ensures consistent comfort and optimal efficiency.
Myth 5: HVAC Ducts Don’t Need Cleaning
Truth: Over time, dust, dirt, mold, and allergens can accumulate in your ducts, reducing air quality and system efficiency. Regular duct cleaning helps improve airflow, reduces allergens, and prevents your system from working harder than necessary. It’s an essential part of maintaining a healthy and efficient home.
Myth 6: The Location of Your Thermostat Doesn’t Matter
Truth: Thermostat placement can significantly impact your HVAC system’s performance. If it’s located in a spot that receives direct sunlight, is near a drafty window, or is too close to a heat-producing appliance, it can give inaccurate readings. This causes your system to overwork or underperform, leading to higher energy bills and inconsistent comfort.
Myth 7: Cranking the Thermostat Heats or Cools Your Home Faster
Truth:
HVAC systems operate at a consistent pace, regardless of how high or low you set the thermostat. Cranking it up or down won’t speed up the process but will likely lead to overshooting your desired temperature and wasting energy. Setting your thermostat to the desired temperature and waiting patiently is the best approach.
The Bottom Line
Understanding the truth about your HVAC system can save you time, money, and frustration. Regular maintenance, professional advice, and using your system wisely are the keys to keeping your home comfortable and your energy bills in check.
If you have questions about your HVAC system or need professional help, reach out to a trusted expert in your area. A little knowledge and preventative care go a long way toward a more efficient and longer-lasting system!