The HVAC Myths You Need to Stop Believing
There are a lot of things in life we just assume to be true—like the five-second rule (which is BS) or that goldfish have three-second memories (they don’t, and they’re probably still pissed at you for forgetting to feed them).
But some myths hit closer to home. Specifically, your home. And MORE specifically, your HVAC system.
If you’ve ever believed that a bigger HVAC system is better, that closing vents saves energy, or that your unit will last forever just because it hasn’t completely given up yet—well, I have some bad news. But also, some good news: we’re busting these myths and telling you what actually works.
Myth #1: “Bigger HVAC Systems Are Always Better”
NOT FOR HVAC SYSTEMS. A bigger unit doesn’t mean better performance. It just means your system will cycle on and off constantly, struggling like an overenthusiastic but wildly unqualified intern.
What to do instead: Get an HVAC system that’s properly sized for your home. An oversized unit will short cycle (turning on and off too frequently), wasting energy, and making your house about as comfortable as a plane cabin. A properly sized unit runs efficiently, cools evenly, and doesn’t spike your energy bill just for fun.
Myth #2: “Closing Vents Saves Energy”
This one makes about as much sense as microwaving ice cream to make it colder. Closing vents doesn’t save energy—it actually makes your system work harder.
Your HVAC is designed to distribute air evenly. When you shut vents, you mess up the airflow, increase pressure in the ductwork, and potentially damage your system. It’s like trying to run a marathon with one shoe—inefficient, uncomfortable, and somehow way more expensive than expected.
What to do instead: Keep those vents open and let your HVAC system do its thing. If you want more control over airflow, consider zoning systems or, you know, just sitting closer to the vent.
Myth #3: “Your HVAC System Will Last Forever”
Nothing in life lasts forever—not your New Year's resolutions, not your phone battery, and definitely not your HVAC system. If you’re still running a unit from the early 2000s, it’s not vintage; it’s a liability.
Most systems last about 10-15 years, but only those with proper maintenance. Ignoring your HVAC is like ignoring the check engine light—it won’t fix itself, and eventually, something expensive will break.
What to do instead: Schedule regular HVAC maintenance, change your air filters (seriously), and know when it’s time to upgrade. Holding onto an ancient unit isn’t “getting your money’s worth”—it’s draining your energy bills and your patience.
Myth #4: “Cranking the Thermostat Cools (or Heats) Your Home Faster”
You know that person who presses the elevator button 15 times, convinced it’ll make it arrive quicker? Yeah. That’s basically what you’re doing when you aggressively adjust your thermostat.
Your HVAC system cools or heats at one speed, no matter how extreme you set the temperature. The only thing you’re changing is how long it runs—so if you were hoping for instant comfort, bad news: all you did was increase your energy bill.
What to do instead: Set your thermostat to a comfortable, realistic temperature and let it do its job. Better yet, get a smart thermostat that manages energy efficiency for you, so you can focus on more important things (like whether or not you can trust that “five-second rule”).
Myth #5: “Air Filters Only Need to Be Changed Once a Year”
Would you wear the same pair of socks for a year? No? Then why are you treating your air filter that way?
A dirty air filter clogs your system, reduces efficiency, and turns your home into a dust-filled sneeze factory. If your allergies are worse indoors than outside, your air filter is probably plotting against you.
What to do instead: Change your air filter every 1-3 months. If you have pets, allergies, or a strong dislike for unnecessary suffering, make it closer to every month.
The Bottom Line: HVAC Myths = Higher Bills & Lower Comfort
Most HVAC myths exist because they sound logical. But believing them won’t just make your system work harder—it’ll cost you more in energy bills, repairs, and lost comfort.
Want your HVAC system to work efficiently, save you money, and not randomly break down when it’s 105°F outside? Ditch the myths, follow the facts, and treat your HVAC system like the home hero it is.
