5 AC Myths You Shouldn't Believe

Cooling your home is essential during a sweltering Texas summer, but there are many misconceptions about air conditioner efficiency that may be spiking your bills!

Common Cooling Myths

These five cooling habits can not only break the bank but can cause premature damage and replacements with overuse.

1. Plants Improve AC Efficiency

A common misconception about air conditioners is that they’re less efficient when the condenser is sitting in the sun. The logic checks out: in theory, the heat from the sun makes the system hotter overall and reduces its ability to cool air down.

However, the reality is that the sun doesn’t have much of an impact on a central air conditioning system’s efficiency. The Department of Energy reports that shading your exterior HVAC unit only improves efficiency by around 3% — which isn’t much of a difference. Additionally, while adding plants near your condenser can hide it from view, planting too close to the unit can actually impact the flow of air and inhibit your system from working as efficiently as it can!

Note that while this isn’t true for central air conditioners, window air conditioners ARE negatively impacted by exposure to the sun.

2. Fans Cool a Room

This one is false on a technicality. Ceiling fans don’t cool the air, but they do cool off your skin, which can make a room feel cooler. The windchill effect created by circulating air can make a room feel up to 4 degrees cooler!

However, the windchill effect only makes you feel cooler when you are in the same room as the fan. Leaving a fan on in empty rooms will just drive up your electric bill.

3. Closing Vents Will Save Money

Closing a vent seems like a good way to focus your HVAC unit’s energy only on the rooms you use. However, it actually reduces the energy efficiency of your system and causes other issues that end up hurting your system (and wallet) in the long run.

A central HVAC system is designed to heat or cool your entire home, not just a portion of it. When you block off a vent, it disrupts the airflow and causes issues with air circulation or can even lead to leaking ductwork! If you want to heat or cool only a portion of your home, and ductless mini-split may be a better solution for you.

4. Thermostat Location Doesn’t Matter

Your thermostat’s location is really important to efficient heating and cooling. Remember that the thermostat is reading the temperature around it and giving commands to your HVAC unit based on that information. If the temperature near the thermostat is not consistent with the rest of your home, it won’t be able to do its job effectively.

This is why it’s important to place your thermostat in a central location like a hallway and away from drafty windows or lamps. Anything that could heat or cool the temperature around the thermostat could affect efficiency.

5. The Bigger, the Better

Oversized HVAC units are so inefficient because they constantly turn off and on. A properly set up air conditioner should run for about 20-25 minutes. This cycle is most efficient. As the unit turns on, it uses a lot of energy, but after a few minutes, it requires less energy to keep going.

If the unit is too powerful, it will cool your home too quickly to take advantage of the efficiency that comes after a few minutes of running. Also, keep in mind that a powerful AC can cause issues with humidity regulation. Your AC is meant to draw moisture from the air, but if it doesn’t have time to do that, your home can become overly humid.

Whether your HVAC system is in need of repairs or replacement, AC Express is the team to call! Schedule your service online or by phone at (512) 866-5520.