Cranking the thermostat up or down does not heat or cool your home faster—HVAC systems run at a steady rate. Instead, it wastes energy and increases utility costs, making smart thermostat use a better option.
In reality, HVAC systems don’t work that way. Whether you set the thermostat to a reasonable temperature or an extreme one, your system heats or cools at the same steady rate. This common misconception often leads to wasted energy, higher utility bills, and unnecessary strain on your system.
How HVAC Systems Work
To understand why cranking the thermostat doesn’t work, it’s important to know how HVAC systems operate.
Heating and Cooling Cycles
- HVAC systems heat or cool at a fixed rate, based on how much energy the system can move at a time.
- Raising or lowering the thermostat setting does not change the speed of heating or cooling.
- The system will run until it reaches the set temperature, then cycle off.
Why Extreme Thermostat Adjustments Don’t Work
- Setting the thermostat to 80°F in winter or 55°F in summer doesn’t speed things up.
- The HVAC system won’t work harder—it just runs longer, potentially overheating or overcooling the space.
- This wastes energy and increases wear and tear on your unit.
Common Myths About Thermostat Adjustments
Many people still believe cranking the thermostat makes a difference. Let’s break down some of the most common myths.
Lowering the Thermostat Cools Your Home Faster
- Air conditioners only work at one speed, regardless of the thermostat setting.
- Setting the thermostat to 55°F won’t cool faster than setting it to 72°F—it just keeps the AC running longer.
- The best way to cool your home is to set the thermostat to your desired temperature and let the system do its job.
Raising the Thermostat Heats Your Home Faster
- Furnaces heat at a fixed rate—setting the thermostat to 85°F won’t warm your home faster than setting it to 70°F.
- The only result is an overheated space and wasted energy.
- A steady, gradual increase in temperature is the best way to warm your home efficiently.
HVAC Systems Work Harder to Reach Extreme Temperatures
- HVAC units don’t have a fast mode—they run at a steady pace until they reach the desired temperature.
- Cranking the thermostat doesn’t force them to produce more heat or cold air.
- It simply extends the runtime, leading to higher energy consumption and higher bills.
How to Heat and Cool Your Home More Efficiently
Instead of cranking the thermostat, try these proven methods to maintain comfort while saving energy.
Use a Programmable or Smart Thermostat
- Smart thermostats adjust temperatures based on time of day and occupancy, ensuring energy efficiency.
- Setting a schedule can help reduce energy use when you’re away.
- Smart systems learn your habits and make automatic adjustments.
Keep Your HVAC System Well-Maintained
- Regular maintenance ensures your system runs efficiently.
- Change air filters every 1-3 months to maintain airflow.
- Have a professional inspect your system twice a year to keep it in top condition.
Improve Insulation and Seal Air Leaks
- Proper insulation helps maintain temperatures, reducing how hard your system works.
- Seal leaks around windows, doors, and ductwork to prevent energy loss.
Use Ceiling Fans to Circulate Air
- Fans help distribute air evenly, reducing the load on your HVAC system.
- In winter, reverse the fan direction to push warm air down.
Set a Comfortable Temperature and Leave It
- In summer, set the thermostat to 78°F when home and 85°F when away.
- In winter, set it to 68°F when home and lower it slightly when sleeping or away.
- Avoid extreme settings that waste energy without speeding up heating or cooling.
Why Cranking the Thermostat Wastes Energy
Higher Energy Bills
- Overshooting your target temperature forces the system to run longer than necessary.
- The U.S. Department of Energy estimates that each degree of extreme adjustment can increase energy use by 5-10%.
Increased Wear and Tear on Your HVAC System
- Frequent, extended operation wears down system components faster.
- This can lead to expensive repairs and a shorter system lifespan.
Temperature Fluctuations and Discomfort
- Rapid adjustments can cause uneven temperatures in different rooms.
- Overcooling or overheating a space makes it uncomfortable and forces constant thermostat changes.
When a Thermostat Adjustment Might Be Necessary
While extreme thermostat settings don’t help, small adjustments can improve comfort and efficiency.
If You’re Away for Long Periods
- Lowering the thermostat in winter by a few degrees can prevent excessive heating costs.
- In summer, a higher setting prevents overcooling while no one is home.
If Your Home Heats or Cools Unevenly
- If some rooms stay too hot or too cold, check for air leaks or blocked vents.
- A zoned HVAC system can help regulate temperature in different areas of the home.
If the Weather Changes Suddenly
- Extreme weather swings can impact home comfort—adjusting the thermostat slightly can help maintain balance.
Final Thoughts
Cranking the thermostat up or down does not heat or cool your home faster. HVAC systems operate at a steady pace, and extreme settings only result in higher energy bills and system strain.
For better comfort and efficiency, use smart thermostats, regular maintenance, and proper insulation. Keeping a consistent, moderate temperature is the key to saving energy and extending the life of your HVAC system.
