Many believe turning down the thermostat saves energy, but maintaining a consistent temperature is often more efficient for overall heating and cooling costs.
Many homeowners believe common thermostat myths that waste energy and increase bills. Let’s separate fact from fiction to optimize your home’s efficiency.
Myth 1: Cranking Thermostat Heats/Cools Faster
This persistent myth causes significant energy waste. Your HVAC system works at a constant rate whether you set it to 70°F or 80°F.
The Science Behind It
HVAC systems deliver air at consistent speeds. A properly functioning thermostat simply tells the system when to stop – not how fast to work.
Real-World Example
Setting your AC to 60°F won’t cool faster than 72°F. It just makes the system run longer, wasting energy.
Myth 2: Closing Vents Saves Energy
Closing vents in unused rooms actually increases energy use by creating pressure imbalances.
| Action | Result |
|---|---|
| Closing vents | Increased duct pressure, system strain |
| Open vents | Proper airflow, efficient operation |
Myth 3: Space Heaters Are More Efficient
While space heaters seem efficient, they typically cost more to operate than central heating.
Cost Comparison
- Central gas heat: $0.50/hour
- Electric space heater: $0.90/hour
Myth 4: Programmable Thermostats Don’t Help
The U.S. Department of Energy estimates proper thermostat programming can save 10% annually on energy bills.
Optimal Settings
- Winter: 68°F awake, 62°F asleep/away
- Summer: 78°F awake, 85°F asleep/away
Myth 5: Leaving Heat On All Day Saves Energy
According to Energy.gov, lowering your thermostat 7-10°F for 8 hours can reduce heating costs by 10% annually.
Myth 6: Thermostat Location Doesn’t Matter
Thermostats placed in direct sunlight or near vents give false readings, causing system inefficiency.
Ideal Placement
- Interior walls
- Away from windows
- Not near heat sources
Myth 7: Manual Thermostats Are Just As Good
Smart thermostats like Nest or Ecobee learn your habits and optimize settings, saving 8-12% on heating and 15% on cooling according to EPA studies.
Myth 8: All Thermostats Work With All Systems
Incorrect thermostat selection can damage equipment. Always verify compatibility with your HVAC system type (single-stage, multi-stage, heat pump).
System Types
- Conventional (gas/oil)
- Heat pump
- Electric
Myth 9: Thermostat Accuracy Doesn’t Matter
A 1°F thermostat error can increase energy use by 2-3%. Consider professional calibration every 2-3 years.
Myth 10: Night Setbacks Waste Energy
While some believe reheating a cooled home uses more energy, studies show nighttime setbacks of 10-15°F save 5-15% on heating bills.
Understanding these thermostat truths helps optimize your home’s efficiency. For more heating insights, explore our guide on thermostat options.
