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Top 10 HVAC Myths Busted
The internet is full of bad HVAC advice — from “closing vents saves money” to “bigger systems are always better.”
Most of it sounds logical… until it costs you efficiency, comfort, or even your warranty.
In this guide, we’re busting the top 10 HVAC myths Calgary homeowners still believe.
Learn what’s true, what’s outdated, and what could actually be hurting your system — so you can keep your home running smarter, not harder.
HVAC Myths That Just Won't Die
HVAC is one of those industries where "my uncle told me" advice spreads faster than wildfire smoke. Problem is, a lot of those "tips" actually cost you money, comfort, and system lifespan.
Here are the top 10 myths we hear all the time—busted with plain-English facts.
Myth #1: Closing Vents Saves Money
The Myth
Shut vents in unused rooms = lower bills.
The Truth
It actually increases system pressure, stressing the blower motor and causing leaks.
Result
Higher bills and possible breakdowns.
Myth #2: Bigger Systems Are Always Better
The Myth
Oversize the furnace/AC "just in case."
The Truth
Oversized systems short-cycle (on/off constantly), wearing parts out faster and leaving humidity problems.
Result
Uncomfortable home + early replacement.
Myth #3: Change Filters Once a Year
01
The Myth
"My filter looks fine, I'll change it yearly."
02
The Truth
Filters clog monthly in high-use seasons, especially in Calgary during wildfire smoke or dusty renos.
03
Result
Frozen coils, overheated furnaces, high bills.
Myth #4: Maintenance Is Optional & Myth #5: All Contractors Are the Same
Myth #4: Maintenance Is Optional
The Myth: "If it's running, don't touch it."
The Truth: Skipping tune-ups leads to efficiency loss and costly failures (heat exchanger cracks, compressor burnout).
Result: $150 tune-up now avoids $3,000+ repair later.
Myth #5: All Contractors Are the Same
The Myth: Pick the cheapest quote—same equipment, right?
The Truth: Installation quality matters more than brand name. Bad installs kill efficiency and warranties.
Result: Pay less today, pay much more tomorrow.
Myth #6: Cranking the Thermostat Heats/Cools Faster
The Myth: "Set it to 30°C to warm up faster."
The Truth: Furnaces and AC run at the same output regardless of setting. You just overshoot and waste energy.
Result: Higher bills and uncomfortable swings.
Myth #7: Duct Cleaning Always Improves Air Quality & Myth #8: Fans Cool Rooms
Myth #7: Duct Cleaning Always Improves Air Quality
The Myth: Annual duct cleaning = healthier home.
The Truth: Unless ducts are filthy (renos, mold, pests), cleaning has little impact. Filtration and humidity control matter more.
Result: Spend on filters, not snake-oil upsells.
Myth #8: Fans Cool Rooms
The Myth: Ceiling fans lower room temperature.
The Truth: Fans don't cool air—they move it. Wind-chill makes you feel cooler, but the thermostat still reads the same.
Result: Great comfort boost, but only saves if you raise AC temp a degree or two.
Myth #9: SEER & AFUE Ratings Always Equal Savings & Myth #10: Portable Units Are Efficient
1
Myth #9: SEER & AFUE Ratings Always Equal Savings
The Myth: Higher efficiency numbers = guaranteed payback.
The Truth: ROI depends on climate and use. In Calgary, AFUE upgrades matter more than SEER, since heating dominates costs.
Result: Don't overspend on high-SEER ACs you'll barely run.
2
Myth #10: Portable Heaters & AC Units Are Efficient
The Myth: Small portable units = cheap to run.
The Truth: They're the least efficient option, often doubling electricity costs.
Result: Short-term fix, long-term bill pain.
Calgary-Specific Myths & The Big Picture
Calgary-Specific Myths
  • "Humidifiers aren't needed." → Wrong. Winter RH here hits 15–20%. A humidifier = comfort + protects wood.
  • "Wildfire smoke doesn't affect HVAC." → False. Smoke clogs filters fast, killing airflow.
  • "80% furnaces are fine in Calgary." → Not with -30°C winters. Code and common sense demand 90%+ AFUE.
The Big Picture: Facts That Always Hold True
  • Airflow is king—don't restrict it.
  • Installation quality beats equipment brand.
  • Preventative maintenance saves thousands.
  • Efficiency ratings only pay off if matched to climate and usage.
  • Trust but verify when dealing with contractors.
Quick DIY Checklist to Avoid Myth Traps
  • Change filters every 1–3 months.
  • Keep vents open and unblocked.
  • Use fans to supplement, not replace AC.
  • Schedule annual tune-ups.
  • Ask for permits and model numbers on quotes.
Conclusion: Don't Let Myths Empty Your Wallet
HVAC myths survive because they sound logical—but most backfire in higher bills, shorter equipment life, or wasted upgrades. Stick to the facts, focus on airflow, maintenance, and proper sizing, and you'll save money while staying comfortable year-round.
About HVACHELP.pro
In a world overflowing with conflicting information, HVACHELP.pro stands as a beacon of clarity for Calgary homeowners. We cut through the noise of common misconceptions and outdated advice, providing honest, evidence-based HVAC guidance specifically tailored to our local climate and challenges. Our mission is to empower you with the knowledge to make informed decisions about your home's heating and cooling systems, saving you money and enhancing comfort.
Myth-Busting Clarity
We dissect popular HVAC myths, revealing the truths that impact your home's efficiency, system lifespan, and your wallet. No more guessing—just clear, actionable facts.
Calgary-Specific Insights
Get advice precisely tailored to our unique local climate, from extreme winter conditions to the annual wildfire season, ensuring optimal system performance and indoor air quality.
Expert Resources
Access comprehensive guides, verified cost-saving tips, and professional recommendations that empower you to make the best decisions for your HVAC needs.
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