Controllable factors include thermostat settings, equipment efficiency, rate selection, and usage timing. This guide ranks 12 proven strategies by annual savings potential, implementation cost, and difficulty level.
All savings estimates are based on North Texas electricity rates and consumption patterns from U.S. Energy Information Administration data.
Quick Reference: All 12 Strategies Ranked
| Rank | Strategy | Annual Savings | Cost | Difficulty |
|---|---|---|---|---|
| 1 | Raise thermostat to 78°F | $100-150 | $0 | Low |
| 2 | Shop electricity rates annually | $100-300 | $0 | Low |
| 3 | Install smart thermostat | $150-200 | $150-300 | Medium |
| 4 | Use 7-10°F setbacks when away | $75-150 | $0 | Low |
| 5 | Switch to time-of-use plan | $100-200 | $0 | Medium |
| 6 | Close blinds on south/west windows | $30-50 | $0 | Low |
| 7 | Run appliances after 7 PM | $50-100 | $0 | Medium |
| 8 | Replace air filters monthly | $25-50 | $60-120/yr | Low |
| 9 | Annual AC tune-up | $50-150 | $100-200 | Low |
| 10 | Seal air leaks | $50-100 | $50-200 | Medium |
| 11 | Upgrade to high-SEER system | $150-250 | $8,000-15,000 | High |
| 12 | Add attic insulation | $100-200 | $1,500-3,000 | High |
Maximum combined savings potential: $500-800/year
Tier 1: No-Cost Behavioral Changes
Raise Thermostat to 78°F
The U.S. Department of Energy recommends 78°F as the optimal summer setpoint for balancing comfort and efficiency. Each degree above 78°F reduces cooling costs by 6-8%.
| Current → Target | Change | Monthly Savings | Annual Savings |
|---|---|---|---|
| 72°F → 78°F | +6° | $72-108 | $144-216 |
| 74°F → 78°F | +4° | $48-72 | $96-144 |
| 76°F → 78°F | +2° | $24-36 | $48-72 |
Tip: Use ceiling fans to maintain comfort (fans allow 4°F higher setpoint with same perceived comfort).
Use 7-10°F Setbacks When Away
Raising thermostat 7-10°F for 8+ hours daily (while at work or sleeping) reduces annual cooling costs 5-15%, according to U.S. Department of Energy research.
Common concern: "Won't my AC work harder to cool back down?" No. The energy saved during the setback period exceeds the energy needed for recovery. Homes lose heat slower when indoor-outdoor temperature difference is smaller.
Close Blinds on South/West Windows
South and west-facing windows receive the most direct sunlight and heat gain. Closing blinds during afternoon hours reduces solar heat gain by 45-65%. Close south blinds by 10 AM, west blinds by 2 PM.
Run Appliances After 7 PM
Dishwashers, clothes dryers, and ovens generate substantial waste heat and moisture that your AC then has to remove. Running them during peak cooling hours (1-7 PM) doubles the energy cost — once for the appliance, once for the extra AC runtime.
Practical shifts: dishwasher on delayed start at 9 PM, clothes dryer after dinner, grill outside on 95°F+ days. On a time-of-use plan, the off-peak rate savings compound the benefit.
Tier 2: Low-Cost Upgrades ($50-300)
Install a Smart Thermostat
ENERGY STAR certified smart thermostats save approximately 8% on heating and cooling costs through learning algorithms, geofencing, and optimized scheduling — without requiring manual programming. Payback period: 1-2 years.
| Model | Price | Key Features |
|---|---|---|
| Google Nest Learning (4th Gen) | $279 | Auto-learning, Matter support, sleek design |
| Ecobee Smart Premium | $249 | Room sensors, voice assistant, air quality |
| Honeywell T9 Pro | $165 | Room sensors, mid-range reliable pick |
| Amazon Smart Thermostat | $80 | Budget option, basic scheduling, Alexa-only |
Texas-specific savings: $150-200/year (vs. ~$50 national average) due to North Texas's extended 7-month cooling season.
Replace Air Filters Monthly
Dirty filters restrict airflow, forcing HVAC systems to work harder. A clogged filter can increase energy consumption 5-15%. Replace monthly during cooling season (April-October).
Annual AC Tune-Up
Professional maintenance restores system efficiency by cleaning coils, checking refrigerant charge, and identifying problems. Unmaintained systems lose 5% efficiency annually. Schedule in spring before cooling season.
Tier 3: Rate Optimization (Free)
Shop Electricity Rates Annually
Texas's deregulated electricity market means you can choose from dozens of retail electricity providers. Rates vary significantly — shopping annually ensures competitive pricing.
Source: ElectricRates.org · Data: U.S. EIA
- Find current rate on recent electricity bill
- Visit Power to Choose to compare Texas electricity rates
- Enter zip code and usage (use 1,000 kWh as baseline)
- Sort by price and compare total monthly cost
- Review contract terms (length, early termination fees)
- Switch online — takes 5 minutes, no service interruption
Switch to Time-of-Use Plan
Time-of-use (TOU) plans charge different rates based on time of day. Peak hours (1-7 PM weekdays) cost more; off-peak hours cost less.
| Period | Hours | Rate |
|---|---|---|
| Peak | 1-7 PM weekdays | $0.18-0.25/kWh |
| Off-peak | 7 PM-1 PM | $0.09-0.12/kWh |
| Super off-peak | 11 PM-6 AM | $0.07/kWh |
Best for: Homes unoccupied 1-7 PM weekdays, EV owners who charge overnight, pool owners who can run pump overnight.
Tier 4: Envelope & Equipment Upgrades
Seal Air Leaks
A typical North Texas home loses 15-30% of its conditioned air through attic penetrations, can lights, rim joists, duct boots, and envelope gaps. Air sealing stops that loss at the source.
- • DIY starter kit ($50-$200): Caulk, expanding foam, weatherstripping. Tackles outlets, plumbing penetrations, attic hatch.
- • Professional blower-door test + sealing ($500-$1,500): Quantifies leakage, targets the biggest leaks first. Recommended for homes built before 2006.
- • Payback: 3-10 years depending on starting leakage. Pairs with insulation — seal leaks first or insulation gets short-circuited by airflow.
Add Attic Insulation
Texas's 2021 energy code recommends R-38 attic insulation minimum (R-49 preferred). Homes built before 2009 often have R-19 to R-30 — enough to underperform badly during Texas summers when attic temperatures hit 140°F+.
Topping up from R-19 to R-38 typically costs $1,500-$3,000 and cuts cooling energy 10-15% in Texas climate. Pair with air sealing for compounding returns. Oncor rebates cover $200-$400 of the cost for qualifying homes, and the 25C federal credit covers 30% of materials (up to $1,200 annual combined cap).
Payback: 8-15 years standalone. With rebates and tax credits, 5-10 years.
Upgrade to High-SEER System
Upgrading from an old SEER 10-14 system to SEER 18+ reduces cooling energy consumption 30-45%. However, efficiency savings alone rarely justify replacement cost — this strategy makes sense when combined with end-of-life replacement.
| Upgrade Path | Energy Savings | Annual $ Savings |
|---|---|---|
| SEER 10 → 18 | 44% | $200-250 |
| SEER 12 → 18 | 33% | $150-200 |
| SEER 14 → 18 | 22% | $100-150 |
| SEER 14 → 20 | 30% | $125-175 |
Recommendation: When replacing end-of-life equipment, upgrade to SEER 18 minimum. The incremental cost over SEER 15 ($2,000-3,000) pays back in 10-15 years in North Texas climate — faster if you stack the federal 25C tax credit ($600 for AC) and Oncor rebates ($400-$800).
Consider a heat pump instead of a straight AC swap
Modern cold-climate heat pumps work efficiently down to 20-25°F — which covers 95%+ of North Texas winter conditions. They replace both your AC and heating in one system, and the federal 25C credit is 30% up to $2,000 for heat pumps (versus $600 for a straight AC). Oncor rebates go up to $1,000.
If your furnace and AC are both nearing end-of-life, a heat pump is often the better economic choice in DFW. See our repair vs. replace decision guide.
Texas Monthly Bill Pattern
See how Texas electricity bills fluctuate by month — summer is where savings matter most.
Source: ElectricRates.org · Data: U.S. EIA
Combined Savings Example
Starting point: 2,500 sq ft home, SEER 14 AC, 72°F setpoint, 1,500 kWh summer consumption
Starting monthly bill: 1,500 kWh × ~$0.16/kWh (typical Texas summer rate including delivery & fees) = $240/month
| Strategy | Savings | New Bill |
|---|---|---|
| Raise to 78°F | -$43 (18%) | $197 |
| Smart thermostat | -$16 (8%) | $181 |
| TOU rate shift | -$18 (10%) | $163 |
| Air filter + tune-up | -$8 (5%) | $155 |
Total reduction: -$85 (35%) | New bill: $155/month | Annual savings: $510 (summer months only; year-round impact higher)
Data Sources
- • U.S. Department of Energy (energy.gov)
- • U.S. Energy Information Administration (eia.gov)
- • ENERGY STAR (energystar.gov)
- • Public Utility Commission of Texas (puc.texas.gov)