Task Guide
How to Program Your Thermostat
A properly programmed thermostat saves 10-15% on energy bills while you sleep and work. Set it once and let it pay you back.
Tools You'll Need
- âś“ Thermostat manual (or smartphone for smart thermostats)
- âś“ Pen and paper for recording current settings
You wouldn’t leave your car running in the driveway all day just so it’s warm when you’re ready to leave. But that’s exactly what most people do with their heating and cooling—run it full blast when nobody’s home to enjoy it. A programmed thermostat fixes this automatically, and the savings add up to hundreds of dollars a year. The best part? You set it once and forget it.
Why This Matters
Heating and cooling accounts for about half of your energy bill. Most of that is wasted on empty houses. Think about your typical day:
- 6 AM - 8 AM: Getting ready, need comfortable temperature
- 8 AM - 5 PM: Everyone’s at work and school, house is empty
- 5 PM - 10 PM: Home, eating, relaxing, need comfortable temperature
- 10 PM - 6 AM: Sleeping, don’t need the same warmth
That’s 9 hours a day when you’re paying to heat or cool an empty house, plus 8 hours when you’re sleeping and don’t notice the temperature as much. Program your thermostat to match your actual life and you save 10-15% on heating and cooling costs. That’s $150-300 per year for the average home.
Understanding Setback Temperatures
The concept is simple: let the temperature drift when you’re not home or sleeping, then bring it back to comfortable before you need it.
Winter setbacks:
- Lower temperature by 7-10°F when away or sleeping
- Don’t go below 55°F (can cause pipe freezing issues)
- Example: 70°F when home, 62°F when away/sleeping
Summer setbacks:
- Raise temperature by 7-10°F when away or sleeping
- Don’t go above 85°F (can cause humidity/mold issues)
- Example: 72°F when home, 78-80°F when away/sleeping
Common myth: Setting the thermostat way high or low heats or cools the house faster. It doesn’t. Your system runs at the same speed regardless. Extreme settings just guarantee overshoot and waste.
Programming Your Thermostat
Step 1: Understand Your Schedule
Before touching the thermostat, write down your actual schedule:
Weekdays:
- What time does the first person wake up?
- What time does the last person leave?
- What time does the first person return?
- What time does everyone go to bed?
Weekends:
- Is someone usually home all day?
- Different wake and sleep times?
Step 2: Learn Your Thermostat
Thermostats vary, but most follow similar patterns:
Basic programmable thermostats:
- 5-2 programming (weekdays different from weekends)
- 5-1-1 programming (weekdays, Saturday, Sunday all different)
- 7-day programming (each day can be different)
Smart thermostats:
- Learn your patterns automatically
- Detect when you’re home or away via phone or motion sensors
- Can be controlled remotely
- Provide energy usage reports
Step 3: Program the Schedule
For a typical work schedule:
Weekdays:
| Time | Event | Winter Temp | Summer Temp |
|---|---|---|---|
| 6:00 AM | Wake | 70°F | 72°F |
| 8:00 AM | Leave | 62°F | 80°F |
| 4:30 PM | Pre-heat/cool | 70°F | 72°F |
| 10:00 PM | Sleep | 65°F | 75°F |
Weekends:
| Time | Event | Winter Temp | Summer Temp |
|---|---|---|---|
| 7:00 AM | Wake | 70°F | 72°F |
| 10:00 PM | Sleep | 65°F | 75°F |
Important: Set the “return” temperature 30 minutes before you actually get home. The house will be comfortable when you walk in.
Step 4: Fine-Tune
After a week, adjust based on reality:
- Too cold in the morning? Raise the wake temperature or start it earlier
- House doesn’t recover in time? Extend the pre-heat/cool period
- Someone works from home? Adjust that day’s schedule
Smart Thermostat Advantages
If you’re still using a basic programmable thermostat, upgrading to a smart thermostat (Nest, Ecobee, Honeywell, etc.) offers real benefits:
- No programming needed – It learns your patterns automatically
- Remote control – Adjust from your phone when plans change
- Occupancy detection – Senses when you’re home or away
- Energy reports – See exactly where your money goes
- Integration – Works with other smart home devices
- Alerts – Warns you of problems, reminds you to change filters
A smart thermostat costs $100-250 and typically pays for itself in 1-2 years.
Common Mistakes to Avoid
- Overriding constantly – If you’re always adjusting, your program is wrong
- Extreme setbacks – More than 10-12°F can strain the system and take too long to recover
- Turning off completely – Heat can lead to frozen pipes; A/C off in humid climates causes mold
- Setting and forgetting forever – Schedules change, re-evaluate seasonally
- Ignoring the pre-heat/cool time – System needs 30+ minutes to reach target
Warning Signs of Problems
- House never reaches set temperature
- System runs constantly without satisfying
- Huge temperature swings between cycles
- Thermostat display is blank or erratic
- Heating when cooling should be running (or vice versa)
- Energy bills suddenly increasing
These indicate problems with the thermostat, HVAC system, or insulation—not normal operation.
DIY vs. Call a Pro
DIY: Programming thermostats, replacing batteries, basic thermostat replacement (if comfortable with low-voltage wiring).
Call a pro: HVAC system problems, thermostat wiring issues, installing new smart thermostats if wiring is unknown or incompatible, heat pump systems with auxiliary heat. Find an HVAC contractor →
How Often to Review
- Seasonally – Switch between heating and cooling programs
- When schedules change – New job, kids in school, retirement
- Annually – Review settings and adjust for efficiency
The Bottom Line
Your thermostat controls half your energy bill. Programming it to match your life is free money—10-15% savings for 20 minutes of setup. Set it, forget it, and let the savings accumulate. If you can’t be bothered to program a thermostat, get a smart one that programs itself. Either way, there’s no excuse for heating and cooling an empty house.