Does shutting vents or turning your A/C off during the day help you save money? While these tips might seem smart, many common HVAC beliefs can actually lead to higher costs and system damage. Let’s break down the top three myths and show you how to make energy-efficient choices that work.
Myth 1: Closing Vents Saves Energy
It seems logical—why heat or cool rooms you’re not using? But closing vents often backfires, reducing efficiency and straining your HVAC system.
Pressure Imbalances Are the Real Problem
When you close vents, your system can develop pressure imbalances. This forces air into unintended places like:
- Duct leaks in attics or crawl spaces
- Increased stress on the blower motor
In fact, leaky ducts can reduce HVAC efficiency by up to 20%. That extra pressure can also lead to premature equipment failure.
Energy Efficiency Takes a Hit
Rather than saving energy, closed vents often result in:
- Longer run times
- Higher utility bills
- Shorter system lifespan
In one case, homeowners who shut vents in multiple rooms actually saw an increase in energy use. Keeping vents open allows your system to run as designed—efficiently and effectively.
Myth 2: Frequent Cycling Saves Power
Turning your system off and on throughout the day may feel energy-smart, but it causes more harm than good.
Increased Wear and Tear
Every time your system powers up, it draws more electricity and puts stress on the motor. Over time, this repeated cycling can cause:
- Faster component wear
- More frequent breakdowns
- Shortened system life
Starting up uses more energy than maintaining a steady indoor temperature—especially during Maine’s temperature swings.
Consistent Use Saves More
Here’s what works better:
- Set the thermostat moderately (like 78°F in summer)
- Let the system run steadily
Case studies show that homes with consistent HVAC use saw lower overall energy costs than those that frequently cycled their systems.
Myth 3: DIY Repairs Are a Safe Way to Save
While DIY videos might make HVAC repair seem simple, many home fixes can cause more harm than good.
Warranties and Damage Risks
Attempting a repair yourself can:
- Void your manufacturer’s warranty
- Cause more extensive system damage
- Lead to higher long-term costs
Most warranties require service by certified professionals, and for good reason—incorrect fixes can compromise your system’s safety and efficiency.
Why Professional Maintenance Matters
Certified HVAC technicians can:
- Catch small problems early
- Perform in-depth cleanings and tune-ups
- Ensure optimal performance and efficiency
Investing in professional maintenance now can save you from expensive repairs—or even full system replacement—later.
Want to Save Money the Right Way?
Mainers have a great resource available: Efficiency Maine offers rebates for energy-efficient upgrades that help you lower your utility bills and improve comfort.
Check out our Efficiency Maine page to learn how you can save.
