Summer cooling costs are one of the biggest expenses for American households — the average home spends $500 or more on air conditioning every year, and in hot climates, that number can easily double. The good news: most of that cost is preventable. These 15 strategies will help you cut your AC bill this summer without sweating through it.
1. Set Your Thermostat to 78°F When You’re Home
The Department of Energy recommends 78°F (26°C) as the sweet spot for summer comfort and efficiency. Every degree you lower below that increases cooling costs by roughly 3%. Setting your thermostat to 85°F when you leave the house — and 78°F when you return — can cut cooling costs by up to 10%.
A smart thermostat makes this automatic. Our guide on smart thermostat savings shows how these devices pay for themselves in the first year.
2. Use Ceiling Fans to Feel 4°F Cooler
A ceiling fan doesn’t actually cool the air — it creates a wind chill effect that makes you feel 4°F cooler than you are. Running a fan costs about $0.01–0.02 per hour, compared to $0.10–0.30 per hour for a central AC unit. Switch fans to counterclockwise in summer (the standard summer direction) and raise your thermostat by 4°F — you won’t feel the difference.
Always turn ceiling fans off when you leave a room. They cool people, not rooms.
3. Block Solar Heat Gain With Window Coverings
Up to 30% of unwanted heat enters through windows. South- and west-facing windows are the biggest culprits in the afternoon hours. Closing blinds or curtains on sun-exposed windows before the heat peaks (around 2–4 PM) can reduce cooling needs by 7–10%.
Cellular shades and blackout curtains perform best. Reflective window film is a one-time investment that blocks 55–75% of solar heat and costs under $30 per window.
4. Stop Air Leaks — They Cost Real Money
Gaps around doors, windows, electrical outlets, and pipes let cool air escape and hot air creep in. The average home has air leaks equivalent to leaving a window open year-round. Sealing them with weatherstripping and caulk typically costs less than $30 and can cut cooling and heating costs by 10–20%.
For a complete audit approach, our home energy audit guide walks through a DIY inspection that identifies exactly where your home is losing money.
5. Change Your AC Filter Every 30–90 Days
A clogged filter forces your AC to work harder to pull air through — increasing energy use by 5–15% with no benefit to comfort. During peak summer use, check your filter monthly. Filters cost $5–15 and take 2 minutes to replace. It’s the cheapest maintenance task with the highest return.
6. Use Insulation to Keep Cool Air In
Attic insulation is the single most impactful energy upgrade for most homes. In summer, a poorly insulated attic can reach 150°F+ — radiating heat down into your living space and forcing your AC to run constantly. Adding insulation to R-38 or R-60 (depending on your zone) can reduce cooling costs by 15–25%.
See our home insulation guide and our breakdown of insulation costs to understand what you’re looking at financially.
7. Cook Outside — Or Use Low-Heat Methods
Your oven can raise kitchen temperature by 10°F or more, forcing your AC to compensate. In summer, shift to grilling outdoors, using a microwave, slow cooker, or Instant Pot — all of which generate far less heat. Batch cooking in the early morning is another approach: cook once when it’s cool, refrigerate, and reheat quickly throughout the week.
8. Run Heat-Generating Appliances at Night
Dishwashers, dryers, and washing machines all generate heat. Run them after 9 PM when outdoor temperatures drop and your AC isn’t fighting peak heat. As a bonus, many utility companies offer lower electricity rates during off-peak hours — check with your provider if time-of-use billing is available in your area.
9. Improve Attic Ventilation
Even with good insulation, a poorly ventilated attic traps heat. Ridge vents and soffit vents work together to create airflow that flushes hot air out before it conducts down into your home. Proper attic ventilation can reduce attic temperatures by 10–30°F and meaningfully reduce AC runtime.
10. Create Natural Cross-Ventilation at Night
On nights when outdoor temperatures drop below indoor temperatures (usually after 9–10 PM in most climates), open windows on opposite sides of the house to create a cross-breeze. Position fans to pull cool air in from the shaded side and push hot air out on the other. This can drop indoor temps by 5–10°F overnight — meaning your AC has less work to do the next day.
11. Upgrade to a Heat Pump for Long-Term Savings
If your AC unit is 10+ years old, consider upgrading to a heat pump. Modern heat pumps provide both cooling and heating at 2–4x the efficiency of traditional HVAC systems. The best models use 50% less energy for cooling than older central air systems.
Our detailed comparison of heat pumps vs furnaces and our guide to the best air-source heat pumps will help you figure out if upgrading makes financial sense.
12. Plant Shade Trees Strategically
Trees planted on the south and west sides of your home can reduce summer cooling costs by 15–35%, according to the Department of Energy. A mature shade tree provides natural air conditioning that costs nothing to run. Fast-growing options like river birch, tulip poplar, and red maple can provide meaningful shade within 5–7 years.
13. Install a Programmable or Smart Thermostat
If you’re still using a manual thermostat, you’re leaving money on the table. A programmable thermostat lets you automatically raise the temperature while you’re at work and lower it before you return. Smart thermostats (Ecobee, Nest) go further — they learn your schedule, monitor occupancy, and optimize settings automatically. Average savings: $50–150/year.
14. Use Exhaust Fans Aggressively
Your bathroom and kitchen exhaust fans pull hot, humid air directly out of your home. Run them during and after showers, and for 15 minutes after cooking. Humidity makes heat feel worse — removing it quickly means your AC runs less and your home feels cooler at a higher thermostat setting.
15. Get a Home Energy Audit
If your energy bills are high despite your best efforts, a professional home energy audit can identify exactly where your home is losing efficiency. Many utility companies offer free or heavily subsidized audits. A professional audit typically identifies $200–500 per year in savings, often through targeted insulation, air sealing, and HVAC improvements.
Start with our DIY home energy audit guide to get a sense of what to look for before calling a professional.
How Much Can You Actually Save?
Implementing all 15 strategies isn’t realistic in one weekend — but even picking 5–7 can cut your cooling costs by 20–40%. For a household spending $600/summer on AC, that’s $120–240 back in your pocket, year after year.
Start with the free or near-free actions (thermostat settings, ceiling fan direction, filter replacement, window coverings) and work your way up to the larger investments (insulation, smart thermostat, upgraded equipment) as budget allows.
For a full-picture view of home energy savings beyond just cooling, our guide to energy saving tips covers year-round strategies that work together with your summer cooling plan.
Take our free Home Savings Audit — a 2-minute quiz based on DOE & EPA data that shows you exactly where your money is going and how to fix it. Start the audit →
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