The Thermostat Mistake That's Costing You Money

Are you trying to lower your energy bills by carefully managing your thermostat? It’s a smart move, but many people make a common mistake that actually wastes energy instead of saving it. This guide will show you the inefficient habits to stop and reveal the best way to set your thermostat for a modern, efficient home.

The Common Mistake: Drastic Temperature Changes

The ad you clicked mentioned “STOP SETTING YOUR THERMOSTAT LIKE THIS.” So, what is “this”? The most common and inefficient habit is making drastic temperature changes. This often happens in two ways:

1. Cranking it to extremes: When you come home to a hot house, your first instinct might be to set the air conditioner to 65 degrees, thinking it will cool the house faster. It won’t. Your AC unit cools at a fixed rate, regardless of whether you set it to 75 or 65. Setting it to an extreme temperature just forces the system to run much longer than needed, wasting a significant amount of energy.
2. Turning the system completely off: Many people believe that turning their HVAC system completely off when they leave for the day is the best way to save energy. While this seems logical, it can be counterproductive, especially in very hot or cold climates. When you turn the system back on, it has to work incredibly hard for a long time to bring the temperature back from an extreme (like 90 degrees in summer) to a comfortable level. This intense recovery period can use more energy than if you had simply let the temperature drift up a few degrees.

These habits put a massive strain on your HVAC system, leading to higher energy bills and increased wear and tear on your equipment.

The Efficiency Secret: Smart Temperature Setbacks

The key to energy efficiency isn’t about making your HVAC system work harder; it’s about making it work smarter. The U.S. Department of Energy recommends a strategy called “temperature setbacks.” This means you program your thermostat to be a few degrees warmer in the summer or cooler in the winter when you are asleep or away from home.

A moderate setback of 7 to 10 degrees Fahrenheit for eight hours a day can save you up to 10% on your annual heating and cooling bills. The system uses far less energy to maintain this setback temperature and then gently return to your comfort setting, compared to recovering from being turned off completely.

Your Guide to Optimal Settings

To put this into practice, you need a plan. Here are the recommended settings for maximum efficiency, which you can adjust based on your personal comfort.

Recommended Summer Settings:

• When you are home and awake: Set the thermostat to 78°F (26°C). This is a comfortable and highly efficient temperature.
• When you are asleep or away: Allow the temperature to rise to around 82-85°F (28-29°C). Your body doesn’t need the same level of cooling when you’re asleep, and this setback provides significant savings.

Recommended Winter Settings:

• When you are home and awake: Set the thermostat to 68°F (20°C). You can always wear a sweater if you feel a slight chill.
• When you are asleep or away: Set the temperature back to 60-64°F (16-18°C). This simple change can make a big difference on your heating bill.

Leveraging Your Modern Thermostat

A “modern, efficient home” relies on modern tools. The type of thermostat you have will determine the easiest way to implement this energy-saving strategy.

Programmable Thermostats

If you have a programmable thermostat, you hold the key to automated savings. Don’t just set it to one temperature and forget it. Take 15 minutes to program a schedule based on your typical week. You can create different settings for weekdays when you’re at work and for weekends when you’re home more often. This “set it and forget it” automation is the single best way to ensure consistent savings without having to think about it every day.

Smart Thermostats

Smart thermostats, like the Google Nest Learning Thermostat or the Ecobee Smart Thermostat, take efficiency to the next level. These devices offer powerful features that go beyond simple scheduling:

• Learning Algorithms: They learn your daily routines and preferences over time and automatically create an optimized schedule for you.
• Geofencing: They can use your phone’s location to detect when you’ve left the house and automatically switch to an energy-saving “Away” mode. When they sense you’re on your way home, they begin adjusting the temperature to your preferred comfort setting.
• Energy Reports: They provide detailed reports showing how much energy you’ve used and when, helping you identify more opportunities to save.

If you are still manually adjusting an old thermostat, upgrading to a programmable or smart model is one of the best investments you can make for your home’s efficiency.

More Tips for Peak Efficiency

Mastering your thermostat settings is a huge step. You can increase your savings even more with these simple habits.

• Use the “Auto” Fan Setting: Your thermostat’s fan has two main settings: “On” and “Auto.” The “On” setting means the fan runs continuously, even when the AC or furnace isn’t actively cooling or heating. The “Auto” setting only runs the fan during a heating or cooling cycle. For energy savings, always use the Auto setting.
• Check Your Air Filter: A dirty, clogged air filter forces your HVAC system to work harder to push air through. This wastes energy and can damage your equipment. Check your filter every month and replace it at least every three months.
• Think About Placement: Thermostats can be tricked by nearby heat sources. Make sure yours isn’t located near a lamp, television, or in direct sunlight, as this can cause it to register a warmer temperature and run the AC unnecessarily.

Frequently Asked Questions

Is it really cheaper to leave the AC on than to turn it off? In most cases, yes. It’s cheaper to use a moderate temperature setback (like raising the temperature to 82°F) than to turn the system completely off. Turning it off allows heat and humidity to build up inside, forcing the system into a long, expensive cycle to cool and dehumidify the house later.

How much money can I really save with a smart thermostat? According to studies by the manufacturers, smart thermostats can save homeowners an average of 10-12% on heating costs and 15% on cooling costs. For the average household, this can translate to over a hundred dollars in savings per year, meaning the device often pays for itself in under two years.

What’s the main difference between a programmable and a smart thermostat? A programmable thermostat follows a fixed schedule that you manually enter. A smart thermostat learns your habits, can be controlled remotely from your phone, and uses features like geofencing to adjust settings automatically, offering a higher level of convenience and potential savings.