Smart Thermostat in Honolulu — $19/yr to Run (42.5¢/kWh)
Your smart thermostat in Honolulu costs about $2/month at 42.5¢/kWh. See daily, monthly, and yearly costs, plus tips to cut your bill.
Honolulu, HI Electricity Rate
42.5¢/kWh
Utility: Hawaiian Electric (HECO)
+227% vs national avg
National avg: 13.0¢/kWh
Daily Cost
$0.05
0.1 kWh/day
Monthly Cost
$1.55
4 kWh/mo
Annual Cost
$19
44 kWh/yr
Lifetime (10yr)
$186
energy only
Monthly Cost Breakdown in Honolulu
| Period | kWh | Honolulu Cost | National Avg | Difference |
|---|---|---|---|---|
| Daily | 0.1 | $0.05 | $0.02 | +$0.04 |
| Weekly | 0.8 | $0.36 | $0.11 | +$0.25 |
| Monthly | 3.6 | $1.55 | $0.47 | +$1.08 |
| Quarterly | 10.9 | $4.66 | $1.42 | +$3.23 |
| Annual | 43.8 | $18.63 | $5.69 | +$12.94 |
Customize Your Smart Thermostat Cost
Adjust usage hours and electricity rate to calculate your exact cost in Honolulu.
Daily
$0.05
Monthly
$1.55
Annual
$19
10-Year
$186
Energy Saving Tips for Smart Thermostat in Honolulu
- ✓Honolulu electricity rates are 227% above the national average — energy efficiency matters more here.
- ✓An ENERGY STAR Smart Thermostat in Honolulu saves ~$4/year compared to standard models.
- ✓A smart Smart Thermostat with scheduling optimization can save ~$4/year at Honolulu rates.
- ✓Honolulu's warm climate (avg 83.7°F) means higher cooling costs — consider ceiling fans to supplement.
- ✓Enable learning features
- ✓Set schedules based on occupancy
ENERGY STAR Savings: Upgrading to an ENERGY STAR Smart Thermostat in Honolulu saves approximately $4/year at local rates — $43 over the appliance lifetime.
Highest-Cost Appliances in Honolulu, HI
See which appliances cost the most to run at Honolulu's 42.5¢/kWh electricity rate.
Level 2 EV Charger (240V)
Transportation · 7,200W
$5,513/yr
$459.43/mo
Electric Furnace
HVAC · 10,000W
$3,829/yr
$319.05/mo
Electric Tankless Water Heater
Water Heating · 18,000W
$2,795/yr
$232.91/mo
EV Charger (Level 2)
Garage · 7,200W
$2,757/yr
$229.72/mo
Boiler (Electric)
HVAC · 6,000W
$2,297/yr
$191.43/mo
Electric Water Heater (Tank)
Water Heating · 4,500W
$2,096/yr
$174.68/mo
Water Heater (Tank Electric)
Water Heating · 4,500W
$2,096/yr
$174.68/mo
Heat Pump
HVAC · 2,400W
$1,634/yr
$136.13/mo
Smart Thermostat Cost in Other Hawaii Cities
| City | Rate | Annual Cost | vs Honolulu |
|---|---|---|---|
| Honolulu (current) | 42.5¢ | $19 | — |
| Maui | 41.5¢ | $18 | $-0 |
Smart Thermostat Energy Cost FAQ — Honolulu, HI
Understanding Smart Thermostat Energy Costs in Honolulu, HI
Honolulu is a mid-sized Hawaii city where residential electricity rates from Hawaiian Electric (HECO) are shaped by regional energy supply and local demand patterns. Running a low-draw appliance like the Smart Thermostat (5W) at Honolulu's rate of 42.5¢/kWh costs approximately $19 per year — $13 more than the national average of $6.
Electricity in Honolulu is significantly more expensive than the national average — 227% higher. For a Smart Thermostat used 24 hours per day, this rate premium adds up to $13 in extra annual costs. Energy-efficient models and usage habits have an outsized impact in high-rate markets like this.
Honolulu has a high cost of living (index: 193), which means electricity is just one of many above-average expenses. Reducing appliance energy costs — even by small amounts — contributes to meaningful household savings in this market. Upgrading to an ENERGY STAR Smart Thermostat can cut energy use by up to 23%, saving approximately $4 per year at Honolulu rates.
In Honolulu's warm climate (avg 83.7°F), HVAC-related appliances tend to run more frequently, compounding energy costs. A Smart Thermostat produces approximately 0.03 tons of CO2 annually at typical usage. Honolulu residents can reduce this footprint by choosing an ENERGY STAR certified unit, optimizing usage patterns, or investing in solar — see our solar savings calculator for Honolulu.
Compare All Energy Costs in Honolulu
See energy costs for 178+ household appliances at Honolulu's local electricity rate.
Frequently Asked Questions
How much does it cost to run a Smart Thermostat in Honolulu, HI?
At Honolulu's average electricity rate of 42.5¢/kWh, a Smart Thermostat costs approximately $19 per year to run. That's about $1.55 per month with typical usage of 24 hours per day.
What is the electricity rate in Honolulu, HI?
The average residential electricity rate in Honolulu, HI is 42.5¢/kWh, which is 227% above the national average of 13.0¢/kWh. The primary utility provider is Hawaiian Electric (HECO).
How much electricity does a Smart Thermostat use per year?
A Smart Thermostat uses approximately 5 watts and consumes about 44 kWh per year with typical usage of 24 hours/day for 365 days/year.
Is a Smart Thermostat expensive to run in Honolulu?
Compared to the national average cost of $6/year, running a Smart Thermostat in Honolulu costs $13 more per year due to higher local electricity rates.
How can I reduce my Smart Thermostat energy cost in Honolulu?
To reduce Smart Thermostat costs in Honolulu: Enable learning features. Set schedules based on occupancy. Upgrading to an ENERGY STAR model saves up to 23% on energy costs. Also check with Hawaiian Electric (HECO) for local energy efficiency rebates and programs.