In the world of HVAC, there’s no shortage of advice floating around—especially on the internet. As someone who’s been in the business for years, I’ve heard just about every myth you can imagine. While some are harmless, others can lead homeowners to make costly mistakes or ignore necessary maintenance. So, I figured it was time to set the record straight.
Whether you’re a seasoned homeowner or a first-time buyer, understanding the truth behind these common HVAC myths can save you money, extend the life of your system, and keep your home more comfortable all year long.
Myth #1: “Bigger is always better when it comes to HVAC systems.”
This is one of the most common misconceptions I come across. It’s easy to think that installing a larger system will heat or cool your home faster, but that’s just not how HVAC works.
When a unit is too large for the space, it actually cycles on and off more frequently. This short cycling wears out your equipment faster and doesn’t allow the system to dehumidify the air properly. In the end, you’ll be left with uneven temperatures, higher energy bills, and more maintenance headaches.
What you really need is a system that’s properly sized based on your home’s square footage, insulation, window placement, and other factors. A qualified HVAC pro (like the team here at Airheads HVAC) can do a load calculation to make sure you’re getting the right size for your home—not just the biggest one.
Myth #2: “You only need to change your filter once a year.”
Nope. That’s a one-way ticket to reduced efficiency, poor air quality, and a struggling HVAC unit. Your air filter plays a key role in protecting your system and keeping your indoor air clean. If it gets clogged, it restricts airflow, forcing your system to work harder and wear out faster.
Most homes need a new filter every 1 to 3 months, depending on your system and your lifestyle. Got pets? Allergies? A dusty environment? You’ll probably want to swap it out more often.
Changing your filter is one of the easiest (and cheapest) ways to extend the life of your HVAC system—and it only takes a few minutes.
Myth #3: “It’s cheaper to keep the thermostat at the same temperature all day.”
I hear this one a lot, and I get the logic. People think that constantly adjusting the thermostat uses more energy than just leaving it alone. But that’s not how it works.
Your HVAC system uses more energy maintaining a temperature over a long period than it does bringing your home back to a comfortable level after it’s been lowered while you’re away. That’s why programmable and smart thermostats are so valuable—they let you reduce heating or cooling when no one’s home, then bring the temp back up (or down) just before you return.
If you’re gone during the day or sleeping at night, lowering or raising the temp just a few degrees can save you a good chunk of money over the course of a year.
Myth #4: “Closing vents in unused rooms saves energy.”
This one seems like common sense—but it can actually hurt your system. When you close vents, it throws off the balance of your HVAC system, increasing pressure in your ductwork. That can lead to air leaks, reduced efficiency, and even damage to your blower.
Your system was designed to move air evenly throughout your home. If you want to control temperatures in different areas, a zoned HVAC system or ductless mini-splits might be a better long-term solution.
Myth #5: “You only need maintenance when something breaks.”
Wrong again. Preventive maintenance is the best way to avoid breakdowns in the first place. Think of it like getting an oil change for your car—you wouldn’t wait until the engine seizes up to do basic maintenance, right?
Annual maintenance helps catch small issues before they turn into big (and expensive) problems. It also keeps your system running efficiently, which can save you money on your utility bills and extend the life of your equipment.
At Airheads HVAC, we recommend a check-up in the spring for your AC and another in the fall for your furnace. Your system will thank you!
Myth #6: “All HVAC contractors are the same.”
This one might not be technical, but it’s important. Not every HVAC contractor brings the same level of experience, training, or customer care. I’ve seen homeowners get burned by fly-by-night companies that cut corners, use low-quality parts, or leave jobs half-finished.
Choosing a licensed, insured, and well-reviewed contractor matters. Look for someone who takes time to explain your options, answers your questions, and stands behind their work.
We built Airheads HVAC on those exact values—honesty, reliability, and treating your home like it’s our own. If you’re in the Pasco or Pinellas County area, we’d be happy to show you the difference.
Final Thoughts
When it comes to your home’s comfort and safety, knowledge is power. Don’t fall for myths that can cost you time, money, and comfort. The truth is, your HVAC system is one of the hardest-working parts of your home—and it deserves a little attention.
By staying informed, changing your filters, scheduling regular maintenance, and working with trusted professionals, you can keep your system running strong for years to come.
And if you ever have a question, need a tune-up, or are considering an upgrade, give us a shout. At Airheads HVAC, we’re here to help—no myths, just honest solutions.