5 Myths about HVAC Systems – Busted!

When it comes to keeping your home or business comfortable during NYC’s blistering summers and freezing winters, there is no shortage of advice out there. Unfortunately, much of the common wisdom surrounding heating and cooling systems consists of outdated misconceptions or outright myths.

Following bad HVAC advice can lead to higher energy bills, unexpected breakdowns, and shortened equipment lifespan. To help you protect your investment, the experts at 212 HVAC debunk the top 5 most common HVAC myths.

Myth 1: Turning the Thermostat Lower Cools Your Home Faster

The Myth: Cranking your thermostat down to 60°F will cool your apartment or brownstone twice as fast on a hot summer day.

The Reality: Your HVAC system delivers cool air at a consistent rate regardless of how low you set the temperature. Setting the thermostat drastically lower simply keeps the compressor running longer until it reaches that lower target temperature, resulting in wasted electricity and unnecessary wear on your system.

Myth 2: You Only Need to Change Your Air Filter Once a Year

The Myth: Air filters last for an entire year before needing replacement or cleaning.

The Reality: Air filters trap dust, pollen, pet dander, and city pollutants continuously. In a dense urban environment like NYC, standard air filters should be checked monthly and replaced or washed every 1 to 3 months. A clogged filter severely restricts airflow, forcing your blower motor to work harder and increasing your monthly energy bills.

Myth 3: Bigger Is Always Better When It Comes to HVAC System Size

The Myth: Buying the largest tonnage HVAC unit guarantees maximum cooling and heating performance.

The Reality: Oversized units short-cycle—meaning they turn on and off rapidly without running long enough to properly dehumidify your space. This leaves your indoor air feeling clammy and leads to premature equipment failure. Proper HVAC sizing requires accurate load calculations based on room square footage, ceiling height, and insulation levels.

Myth 4: Closing Vents in Unused Rooms Saves Energy

The Myth: Closing air registers or dampers in empty bedrooms lowers heating and cooling costs.

The Reality: Modern forced-air HVAC systems are balanced to distribute static pressure evenly throughout your entire duct network. Closing vents disrupts this pressure balance, forcing your system to work harder against built-up duct pressure. This can cause duct leaks, cracked heat exchangers, and reduced overall system efficiency.

Myth 5: Annual HVAC Maintenance Is an Unnecessary Expense

The Myth: If your heating or AC unit is running fine, there is no need to pay for regular tune-ups.

The Reality: Preventive maintenance is essential for catching minor component wear, refrigerant leaks, or dirty coils before they escalate into major, expensive failures. Regular seasonal tune-ups keep your system running at peak efficiency, extend its operational life, and maintain active manufacturer warranty coverage.